[New Project Setup] How to find out/decode wiring information and pin-outs

   #1  

gokarty

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Car in Question: 2017 NAR VW Jetta SEL (BCM PQ25 Max3 7E0937190)

End Goal of project: To wire a SPST switch to control DRLs. If it works, maybe even use more SPST switches to control other functionality.


Description of current problem: I read up about relay 173 (controls DRLs) in older cars but according to erWin that relay isn't in use since July 2016. So I'm trying to find the output wire from the BCM that controls the DRL. To do this, I downloaded the Wiring Diagram from erWin using my VIN but it is 999 pages long and I (with no experience doing any of this) am struggling to find the info I need.

Using erWin's iWire online utility seems helpful as I found the pin-out for my rotary light switch which then lead me to find that the BCM/Vehicle-Electrical-System-Control-Module is labeled in the diagrams as J519

But how do I find the pin for the DRLs?

https://imgur.com/a/UrlRekE



----------More info on project below----------------

Project Justification: Multiple secure area checkpoints in sequence, cannot have any lights on. Holding the handbrake slightly is even more suspicious according to security personnel.

Why not turn off with VCDS? Because I would prefer to have an on-demand DRL switch. Since DRL is BCM controlled, using VCDS would require me carry a laptop, plug in and then turn off DRL. Also, I prefer to have DRLs during normal driving so disabling them permanently is not an option for me.

More benefits of having DRL switch: Can use easily in drive-in cinema, drive through Christmas lights parks, reaching a dark-sky village for star gazing etc.

Other thoughts: DRLs turn off when handbrake is pulled, maybe I can wire in a switch that gives a constant to the wire to fool the BCM to think handbrake is pulled and turn off DRLs but again this would mean that the warning "Release parking brake!" would annoy the driver
 
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   #2  

gokarty

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Update: Even though the DRLs are LED from factory, they should be at the very least fused right? Since an LED with a short could pull many amps and damage the internals

So I guess I need to also look into which fuse controls the DRLs (unless a single fuse controls the entire headlight unit)


Edit: it seems like a single fuse guards the entire headlight unit. It's fuse 12 for the right-side headlight, Fuse 11 for left side (for HID headlights)
 
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   #3  

Uwe

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In your other thread, you confirmed that pulling up a bit on the hand-brake kills the DRLs. I would think you could simulate that condition to the car with a SPST switch.

-Uwe-
 
   #4  

gokarty

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In your other thread, you confirmed that pulling up a bit on the hand-brake kills the DRLs. I would think you could simulate that condition to the car with a SPST switch.

-Uwe-

Yes but then the MFD would play a tone and show warning "Release parking brake"
 
   #5  

DV52

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gokarty: If I may intrude on your conversation - it seems to me that for your objective (i.e. to use a simple switch to control the DRL) to be successful, you must resolve the following two issues:

First: As a basic design construct, the DRL function is not a state (of itself) that's generated directly by a physical switch. If you think holistically about the way that DRLs fit into the wide spectrum of lighting functions in a modern car, it becomes clear (to me at least) that DRLs result from the absence of night-time lighting (i.e. parking lights/low-beam). Hence my contention that the DRL function are not a lighting state in its own right -certainly not in the same way that blinkers, or main-beam, or Parking lights, or reverse lights, or fog lights are a defined lighting state that are turned-ON/OFF with a switch

Second: At least as far as lighting is concerned and unlike in days-of-old, the BCM in modern cars acts as an intermediary: light switches become "inputs" to the control module and voltage supply to the lights (PWM waveform) are "outputs" from the BCM. It's only possible to impute a functional end-to-end circuit from a fuse somewhere to the light switch and then to the lamp - there certainly isn't a physical wiring circuit between the the three!

What these two "confounders" mean for your project (I think) is that control of DRLs with a simple SPST switch will be problematic. At the very least, I suspect that you will need to manage multiple dependencies in your solution - which I imagine will necessitate logic-gate technology as a minimum - I think!

Of course the other approach is to abandon entirely your search for a specific DRL -ON/OFF pin on the BCM (I doubt that the Jetta has such a pin) - and instead use the principle embedded in my "First" point above: use the ON/OFF status for either Parking Lights, or Low beam lights as a surrogate for DRL-OFF/ON respectively. But again, because of the role played by the BCM, multiple dependencies need to be resolved - I think

Don
 
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   #6  

gokarty

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gokarty: If I may intrude on your conversation - it seems to me that for your objective (i.e. to use a simple switch to control the DRL) to be successful, you must resolve the following two issues:

First: As a basic design construct, the DRL function is not a state (of itself) that's generated directly by a physical switch. If you think holistically about the way that DRLs fit into the wide spectrum of lighting functions in a modern car, it becomes clear (to me at least) that DRLs result from the absence of night-time lighting (i.e. parking lights/low-beam). Hence my contention that the DRL function are not a lighting state in its own right -certainly not in the same way that blinkers, or main-beam, or Parking lights, or reverse lights, or fog lights are a defined lighting state that are turned-ON/OFF with a switch

Second: At least as far as lighting is concerned and unlike in days-of-old, the BCM in modern cars acts as an intermediary: light switches become "inputs" to the control module and voltage supply to the lights (PWM waveform) are "outputs" from the BCM. It's only possible to impute a functional end-to-end circuit from a fuse somewhere to the light switch and then to the lamp - there certainly isn't a physical wiring circuit between the the three!

What these two "confounders" mean for your project (I think) is that control of DRLs with a simple SPST switch will be problematic. At the very least, I suspect that you will need to manage multiple dependencies in your solution - which I imagine will necessitate logic-gate technology as a minimum - I think!

Of course the other approach is to abandon entirely your search for a specific DRL -ON/OFF pin on the BCM (I doubt that the Jetta has such a pin) - and instead use the principle embedded in my "First" point above: use the ON/OFF status for either Parking Lights, or Low beam lights as a surrogate for DRL-OFF/ON respectively. But again, because of the role played by the BCM, multiple dependencies need to be resolved - I think

Don

Don,

Firstly, thank you very much for your input! :)

However, I'm not sure if I understand correctly, even if the LED DRLs are controlled by PWM, there has to be a way for the car to send that PWM signal to the LED right? So the BCM would probably be the one to send that PWM via a wire right?

Now, erWin mentions about some cars having an "LED DRL Module" but even this module needs to be getting an input from somewhere

Another thing, so the DRLs have two different brightness modes in the 2017 Jetta, when the headlights are off, the DRLs are bright and when the headlights are on, the DRLs are still on but get dimmed significantly

So if the DRLs get dimmed, surely the BCM has to have a connection to the LED?

So even if it's a PWM signal, I can wire in an SPST switch to break that circuit and turn off the DRL? I would imagine this would work because otherwise how do the DRLs turn off when I turn on any turn signal, it must be that the BCM has atleast one "control wire" running to each DRL

Your point about the light switch not being in the circuit is correct because removing every pin individually also didn't turn off the DRL, infact interesting side note, if you pull out the rotary light switch and disconnect the 10 pin harness and turn the car on, the car turns on its headlights and taillights which might be a safety feature

Also note: When I say LED DRL i do not mean an LED bulb, the 2017 Jetta has a built in DRL strip into the headlight housing and this DRL cannot be replaced
Reference image of DRLs : https://volkswagenofkamloops.files.wordpress.com/2016/09/wolfsburglights.jpg
 
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   #7  

m87a

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you misunderstood Don, in order to control DRL bcm has 2 wires (2 for positive and a ground in total 3 wires) for left and 3 wires for right module, one is +12V and other is pwm signal and ground, if you "cut" either wire pin4 or pin 10 or ground and add switch, bcm will register open circuit causing bulb out warning to appear on the dash. PWM signal i believe goes from 3v to 12v? (correct me if I'm wrong) and this controls the led brightness. So this is not an easy solution as you would think.
What you could try to search is to turn off drl via vcds and try to wire in a power directly or by relay to wires controling drl and hoping that bcm won't be fried :) of course you do this on your own risk.
 
   #8  

gokarty

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you misunderstood Don, in order to control DRL bcm has 2 wires (2 for positive and a ground in total 3 wires) for left and 3 wires for right module, one is +12V and other is pwm signal and ground, if you "cut" either wire pin4 or pin 10 or ground and add switch, bcm will register open circuit causing bulb out warning to appear on the dash. PWM signal i believe goes from 3v to 12v? (correct me if I'm wrong) and this controls the led brightness. So this is not an easy solution as you would think.
What you could try to search is to turn off drl via vcds and try to wire in a power directly or by relay to wires controling drl and hoping that bcm won't be fried :) of course you do this on your own risk.

Yes, you're right about the bulb warning but that could be coded out using VCDS
Also, the open circuit problem you mention is actually what I need because then the SPST would be the deciding factor of when the circuit is closed so it shouldn't mater if i cut the PWM or Power or Ground wire right? Unless I'm missing something?

I would probably cut/modify the PWM wire since I'm guessing it doesn't carry too much current through it
 
   #9  

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Or.... you could use a dpdt to control both the left and right, tie output of your switch to its normal path. Find out the resistance of the circuit, and install a resistor to simulate it, and attach it to the other side of the dpdt switch when its in the bypass position. Just a thought.
 
   #10  

m87a

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I don't know about NAR vehicles but is it possible to add euro switch and code it so that at 0 drl is off?
 
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   #12  

gokarty

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Received the Hex V2 today!

Auto-Scan below:

(Note this is the first scan I ran on my car, so the malfunction is very strange, however I think it can be ignored for this DRL thread)

Code:
Tuesday,31,March,2020,21:52:34:39190
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64(VirtualBox)
VCDS Version 19.6.2.2 (x64)  HEX-V2 CB: 0.4508.4
Data version: 20200210 DS308.0
www.Ross-Tech.com


VIN: 3VWL17AJ2HM******   License Plate: 
Mileage: 61030km-37922mi   Repair Order: 



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: AJ-VW36 (7E0)
Scan: 01 02 03 04 05 08 09 13 15 17 19 25 2B 3C 44 5F 61 75

VIN: 3VWL17AJ2HM******   Mileage: 61030km-37922miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: Malfunction 0010
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
13-Auto Dist. Reg -- Status: OK 0000
15-Airbags -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
2B-Steer. Col. Lock -- Status: OK 0000
3C-Lane Change -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000
61-Battery Regul. -- Status: OK 0000
75-Telematics -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CPRA)       Labels:. 06K-907-425-V2.clb
   Part No SW: 06K 906 071 BE    HW: 06K 907 425 C
   Component: R4 1.8l TFS   H13 4889  
   Revision: --H13---    
   Coding: 001A0092244400175000
   Shop #: WSC 00066 790 00015
   ASAM Dataset: EV_ECM18TFS02006K906071BE 001009
   ROD: EV_ECM18TFS02006K906071BE.rod
   VCID: 6FBBD54837149D1F20F-803B

No fault code found.
Readiness: 1110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels: 09G-927-749-V2.clb
   Part No SW: 09G 927 158 BC    HW: 09G 927 158 
   Component: AISIN AG6 G3  202 3114  
   Coding: 010200000C000000000000000000000000000000
   Shop #: WSC 00066 790 00015
   ASAM Dataset: EV_TCMAQ250031 002009
   ROD: EV_TCMAQ250031_002_VW26.rod
   VCID: 75B7E7205548A7CFEA3-8021

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 1K0-907-379-60EC1F.clb
   Part No SW: 1K0 907 379 CC    HW: 1K0 907 379 CC
   Component: ESP MK60EC1   H46 0175  
   Revision: 00H46001    
   Coding: A14B400C492B0003851302EA921C004100F0F01A
   Shop #: WSC 00066 790 00295
   VCID: 75B7E72055C8A7CFEA3-8021

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J518)       Labels:| 5K0-959-434.clb
   Part No SW: 5K0 959 434 G    HW: 5K0 959 434 
   Component: VWKESSYPQ35GP 092 1305  
   Revision: 00092000    Serial number: 0418626241
   Coding: 032C0C
   Shop #: WSC 12345 123 61029
   ASAM Dataset: EV_KESSYPQ35G A02717
   ROD: EV_KESSYPQ35G_A02_VW31.rod
   VCID: 392F2B1039D003AFCEB-806D

1 Fault Found:
12715520 - Function Restricted due to Missing Message(s) 
          U1111 00 [137] - -
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 219
                    Mileage: 61035 km
                    Date: 2020.03.31
                    Time: 21:53:28


-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels:| 5K0-907-044.clb
   Part No SW: 1K8 907 044 CL    HW: 1K8 907 044 CL
   Component: Climatronic   H08 0405  
   Revision: 00001K05    
   Coding: 0050011002
   Shop #: WSC 12345 123 61029
   ASAM Dataset: EV_Climatronic A01010
   ROD: EV_ClimaAutoBasis_VW36.rod
   VCID: 7BA3F118736CF1BF9C7-802F

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 7E0-937-BCM-V1.clb
   Part No SW: 7E0 937 190 B    HW: 7E0 937 190 
   Component: BCM PQ25 Max3 H81 0744  
   Revision: B8081001    Serial number: 88003324160043
   Coding: 63994BBA08AB0B00093926C02CC886C5DBC672FE608571F0B0A050032844
   Shop #: WSC 12345 123 61029
   VCID: 2B030158C30CA13F4C7-807F

   Subsystem 1 - Part No: 5K7 955 559 C  Labels: 5K7-955-559.CLB
   Component: RLS 051016 04  42  0106 
   Coding: 0228DD

   Subsystem 2 - Part No SW: 6R0 959 801 DF    HW: 6R0 959 801 DF  Labels: 6R0-959-801.CLB
   Component: J386__TSG_FT  022 1467 
   Serial number: 14102743161111040253
   Coding: 820000

   Subsystem 3 - Part No SW: 6R0 959 802 DJ    HW: 6R0 959 802 DJ  Labels: 6R0-959-802.CLB
   Component: J387__TSG_BT  022 1467 
   Serial number: 14102742161107144632
   Coding: 820000

   Subsystem 4 - Part No SW: 5K0 959 591 A    HW: 6R0 959 591 D
   Component: J245 PS41.402  H03 0004 
   Serial number: 0000FST00183XGP00000
   Coding: 180000

   Subsystem 5 - Part No SW: 6C0 959 442 B    HW: 6C0 959 442 B
   Component: E221__MFL-TAT  H06 0023 
   Serial number: 2771623205202400AF1B
   Coding: 2C0000

   Subsystem 6 - Part No SW: 6R0 959 811 T    HW: 6R0 959 811 T
   Component: J388__TSG_HL  022 1467 
   Serial number: 14102745161111130501
   Coding: 000000

   Subsystem 7 - Part No SW: 6R0 959 812 T    HW: 6R0 959 812 T
   Component: J389__TSG_HR  022 1467 
   Serial number: 14202744161107074551
   Coding: 000000

No fault code found.

-------------------------------------------------------------------------------
Address 13: Auto Dist. Reg (J428)       Labels:| 7N0-907-572.clb
   Part No SW: 7N0 907 572 C    HW: 7N0 907 572 
   Component: ACC Bosch PQx H03 0211  
   Serial number: 24111604380638
   Coding: 01005002FE0779
   Shop #: WSC 00066 790 00295
   ASAM Dataset: EV_ACCBEGVW361 001006
   ROD: EV_ACCBEGVW361_VW32.rod
   VCID: 3635202C08CEECD7239-8063

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:* 561-959-655.clb
   Part No SW: 561 959 655     HW: 561 959 655 
   Component: AirbagVW11    008 0210  
   Serial number: 003RXM09RC9D
   Coding: 8CCCF000000000005000001AC20800000065
   Shop #: WSC 00066 790 00015
   ASAM Dataset: EV_AirbaVW11SMEVW411 001002
   ROD: EV_AirbaVW11SMEVW411_VW32.rod
   VCID: 6393A978EBDC297FB47-8037

   Seat occupied recognition: 
   Subsystem 1 - Part No SW: 4M0 959 339 B    HW: 4M0 959 339 B
   Component: BF-Gewichtss.  H13 0022 
   Serial number: IBH0000000000063C6NA
   Coding: 303146

   Crash sensor for side airbag: driver side: 
   Subsystem 2 - Part No SW: -----------    HW: 480 002 510 16
   Component: SideSensor_Df  001 0887 
   Serial number: 3570000000075D84DE1.

   Crash sensor for side airbag: front passenger side: 
   Subsystem 3 - Part No SW: -----------    HW: 480 002 510 16
   Component: SideSensor_Pf  001 0887 
   Serial number: 3580000000094784DE1X

   Crash sensor for side airbag: rear: driver side: 
   Subsystem 4 - Part No SW: -----------    HW: 480 020 810 16
   Component: SideSensor_Dr  000 0148 
   Serial number: 3510001B72303C93847-

   Crash sensor for side airbag: rear: passenger side: 
   Subsystem 5 - Part No SW: -----------    HW: 480 020 810 16
   Component: SideSensor_Pr  000 0148 
   Serial number: 3520001B72303C93883.

   Crash sensor for front airbag: driver side: 
   Subsystem 6 - Part No SW: -----------    HW: 480 022 710 16
   Component: FrontSensor_D  000 0189 
   Serial number: 3550001C1223536345FW

   Crash sensor for front airbag: front passenger side: 
   Subsystem 7 - Part No SW: -----------    HW: 480 022 710 16
   Component: FrontSensor_P  000 0189 
   Serial number: 35600019D22AFFC6626R

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 5K0-920-xxx-17.clb-SRI1
   Part No SW: 5C6 920 976 D    HW: 5C6 920 976 D
   Component: KOMBI         H02 1104  
   Serial number: 00000000000000
   Coding: 221A010000
   Shop #: WSC 12345 123 61029
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A05733
   ROD: EV_Kombi_UDS_VDD_RM09_005_VW25.rod
   VCID: 333319381BBCF9FF047-8067

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 7E0-909-901.clb
   Part No SW: 7E0 909 901     HW: 7E0 937 190 
   Component: GW-K-CAN TP20 H81 0744  
   Revision: B8081001    
   Coding: 102203
   Shop #: WSC 12345 123 61029
   VCID: 6889BE54127A4A27615-803D

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer (J334)       Labels:| 5K0-920-xxx-25.clb
   Part No SW: 5K0 953 234     HW: 5K0 953 234 
   Component: IMMO          H02 1104  
   Serial number:               
   Coding: 000007
   Shop #: WSC 00066 790 00318
   ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03710
   ROD: EV_Immo_UDS_VDD_RM09.rod
   VCID: 6A8DC45C0CF67837771-803F

No fault code found.

-------------------------------------------------------------------------------
Address 2B: Steer. Col. Lock (J764)       Labels:* 5K0-905-861.clb
   Part No SW: 5K0 905 861 D    HW: 5K0 905 861 D
   Component: ELV-PQ35      H22 0240  
   Revision: 00000000    Serial number: 16000164262007
   Coding: 4900000000000000
   Shop #: WSC 00066 790 00318
   ASAM Dataset: EV_ELVMarquMPVW36X A01001
   ROD: EV_ELVMarquMPVW36X.rod
   VCID: 313F1330E1A0CBEF76B-8065

No fault code found.

-------------------------------------------------------------------------------
Address 3C: Lane Change (J1086)       Labels:| 5Q0-907-686.clb
   Part No SW: 5Q0 907 686 B    HW: 5Q0 907 686 B
   Component: HRE_Master    H12 0071  
   Serial number: 0419928869
   Coding: 01011101
   Shop #: WSC 00066 790 00295
   ASAM Dataset: EV_HREntryHella 001028
   ROD: EV_HREntryHella_VW32.rod
   VCID: 3C21320436E23687D5D-8069

   Lane Change Assistant 2: 
   Subsystem 1 - Part No SW: 5Q0 907 685 B    HW: 5Q0 907 685 B
   Component: HRE_Slave  H12 0071 
   Serial number: 0417102021          
   Coding: 010111

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1K0-909-14x-GEN3.clb
   Part No: 1K0 909 144 R
   Component: EPS_ZFLS Kl. 306    3501  
   Revision: 00H22000    
   Shop #: WSC 02069 000 90108
   VCID: 392F2B10355003AFCEB-806D

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:| 5G0-035-MIB-STD2.clb
   Part No SW: 5C0 035 684 B    HW: 5C0 035 684 B
   Component: MU-S-NS-US    H31 0359  
   Serial number: VWZAZ2S0626354
   Coding: 02630102BE00000051220001001808009F0100D400200105C6
   Shop #: WSC 00066 790 00015
   ASAM Dataset: EV_MUStd4CTSAT 001022
   ROD: EV_MUStd4CTSAT_VW36.rod
   VCID: 2411EA64AE526E478DD-8071

   Data medium: 
   Subsystem 1 - Part No SW: 3G0 919 866 BB    HW: -----------
   Component: NAR 2017  --- 0525 
   Serial number: --------------------

No fault code found.

-------------------------------------------------------------------------------
Address 61: Battery Regul. (J840)       Labels:. 1K0-907-534.clb
   Part No SW: 7E0 907 534     HW: 7E0 937 190 
   Component: Batt.regelung H81 0744  
   Serial number: 88003324160043
   Coding: 01240859
   Shop #: WSC 45359 001 1048576
   VCID: 6889BE54127A4A27615-803D

No fault code found.

-------------------------------------------------------------------------------
Address 75: Telematics (J949)       Labels:| 12E-035-284.clb
   Part No SW: 561 035 285 A    HW: 561 035 285 A
   Component: OCULowUSA     020 0160  
   Serial number: 000003554140557
   Coding: 02630102C24232107F1606000000
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_OCULow 002010
   ROD: EV_OCULow_002.rod
   VCID: 1471BAA47EF21EC77DD-8041

No fault code found.

End----------(Elapsed Time: 01:39, VBatt start/end: 14.3V/14.3V)-----------
 
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   #13  

Dana

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Thanks for the scan. I replied to this thread with suggestions for some conflicts I spotted. Please try those suggestions first in an attempt to get all coding values back to a factory-like condition before we try making additional modifications.
 
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Dana

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Using the latest condition 09 coding as the baseline

Address 09: Cent. Elect. (J519) Labels:. 7E0-937-BCM-V1.clb
Part No SW: 7E0 937 190 B HW: 7E0 937 190
Component: BCM PQ25 Max3 H81 0744
Revision: B8081001 Serial number: 88003324160043
Coding: 7B994B9A08AB0B000939268024C886C54BC6720E60A571F0B0A050032844
Shop #: WSC 12345 123 61029
VCID: 2B030158C30CA13F4C7-807F

... I would try enabling Byte 12, Bit 1 Daytime Running Light (DRL) adjustable (Manually AND/OR Instrument Cluster) to see if it adds a new MFA/Cluster menu at all, and if so, if that new menu happens to toggle on/off DRLs. That would result in:

Code:
7B994B9A08AB0B000939268026C886C54BC6720E60A571F0B0A050032844

If it doesn't you might want to undo that change.

The only other coding specific DRL option I see that may be worth experimenting with isn't in the English file: LC,23,5,Tagfahrlicht aktiv wenn Standlicht aktiv

23/5 is enabled so it may be worth turning it off just to see what the end results are.
 
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gokarty

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Using the latest condition 09 coding as the baseline



... I would try enabling Byte 12, Bit 1 Daytime Running Light (DRL) adjustable (Manually AND/OR Instrument Cluster) to see if it adds a new MFA/Cluster menu at all, and if so, if that new menu happens to toggle on/off DRLs. That would result in:

Code:
7B994B9A08AB0B000939268026C886C54BC6720E60A571F0B0A050032844

If it doesn't you might want to undo that change.

The only other coding specific DRL option I see that may be worth experimenting with isn't in the English file: LC,23,5,Tagfahrlicht aktiv wenn Standlicht aktiv

23/5 is enabled so it may be worth turning it off just to see what the end results are.

Dana, thank you for your help

I tried both the changes:

1) Turning on DRL adjustable in Instrument Cluster: This did not work and I did not get an extra menu, On Googling I found out that people say that PQ25 does not support the "Convenience" Menu so this doesn't work for non-PQ35 cars

2) Byte 23 Bit 5: This turned off the DRL permanently and the LED strip in the headlight never illuminates even on AUTO or OFF or LOWBEAM
 
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Dana

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Thanks for testing both. Now that you mention it .. I thought it was possible to enable some cluster menus on non-PQ35 cars but that must have been for non MFA cars rather than the objective here with factory MFA. Upon reflection I found this https://forums.vwvortex.com/showthread.php?5660041-HUGE-DISCOVERY-Activate-Full-MFD-on-your-MK6


Moving forward, I don't have any other coding suggestions to offer.

From the hardware point of view the AW0 (i.e PQ25) wiring diagram I located lacks proper identification of the connections to E1 but T10h/8 is terminal 30 (and a larger gauge wire) so I'm going to assume that this applies to the internal function of your switch: 8 & 9 = Constant in off position (DRL/TFL)

Useful sources for comparison include Don's contributions in posts 13+ here: https://forums.ross-tech.com/showth...hase-of-HEX-V2&p=196256&viewfull=1#post196256

.. and this oldie which may go a long way when you pull the E1 headlight switch: https://forums.vwvortex.com/showthr...light-Switch-to-run-parking-lights-(MkVI-GTi)

Keep in mind that both the well-labeled example wiring diagram Don used -and- JTwGTI's car were both PQ35s however the info should be useful if you decide to remove the switch and pull the green/white wire out of terminal T10h/9 to see if that disables DRLs when you plug it back in. That was the easiest way to disable early (2011 - 2012era) Mk6 Jetta models per the Daytime Running Lights (DRL) section here: http://wiki.ross-tech.com/wiki/index.php/VW_Jetta_(16/AJ)_Tweaks#Lighting

If it happens to disable them you could either shop for a switch that has extra functions or just put a new switch in-between the headlight switch and the BCM on that wire which would allow you to turn them off manually.
 
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gokarty

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Thanks for testing both. Now that you mention it .. I thought it was possible to enable some cluster menus on non-PQ35 cars but that must have been for non MFA cars rather than the objective here with factory MFA. Upon reflection I found this https://forums.vwvortex.com/showthread.php?5660041-HUGE-DISCOVERY-Activate-Full-MFD-on-your-MK6


Moving forward, I don't have any other coding suggestions to offer.

From the hardware point of view the AW0 (i.e PQ25) wiring diagram I located lacks proper identification of the connections to E1 but T10h/8 is terminal 30 (and a larger gauge wire) so I'm going to assume that this applies to the internal function of your switch: 8 & 9 = Constant in off position (DRL/TFL)

Useful sources for comparison include Don's contributions in posts 13+ here: https://forums.ross-tech.com/showth...hase-of-HEX-V2&p=196256&viewfull=1#post196256

.. and this oldie which may go a long way when you pull the E1 headlight switch: https://forums.vwvortex.com/showthr...light-Switch-to-run-parking-lights-(MkVI-GTi)

Keep in mind that both the well-labeled example wiring diagram Don used -and- JTwGTI's car were both PQ35s however the info should be useful if you decide to remove the switch and pull the green/white wire out of terminal T10h/9 to see if that disables DRLs when you plug it back in. That was the easiest way to disable early (2011 - 2012era) Mk6 Jetta models per the Daytime Running Lights (DRL) section here: http://wiki.ross-tech.com/wiki/index.php/VW_Jetta_(16/AJ)_Tweaks#Lighting

If it happens to disable them you could either shop for a switch that has extra functions or just put a new switch in-between the headlight switch and the BCM on that wire which would allow you to turn them off manually.

Alright thanks! I'll remove pin 9 from the switch and update you with the results!
 
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@Dana: Galvanized into action by your intriguing research - I had to take a look at how the Golf version before the mk6 (my previous WD extract) managed the LDS function wrt the DRL. The arrangement for the Golf mk5 looks a bit like this:

f8M0Eot.png


So - based on the WD s for a cohort of 2 x Golfs models (actually, it's 3 x Golf models because the mk7 is the same), it would appear that there has been a consistent design approach accross the models regarding how the DRLs are wired: the 0 position on the LDS consistently applies a T30 Voltage to the "TFL" pin and it's the absence of this voltage that switches-off the DRLs (with the consequence of turning-on some variant of the night-time lights). Compelling stuff, IMO!

Don
 
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gokarty

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@Dana: Galvanized into action by your intriguing research - I had to take a look at how the Golf version before the mk6 (my previous WD extract) managed the LDS function wrt the DRL. The arrangement for the Golf mk5 looks a bit like this:

f8M0Eot.png


So - based on the WD s for a cohort of 2 x Golfs models (actually, it's 3 x Golf models because the mk7 is the same), it would appear that there has been a consistent design approach accross the models regarding how the DRLs are wired: the 0 position on the LDS consistently applies a T30 Voltage to the "TFL" pin and it's the absence of this voltage that switches-off the DRLs (with the consequence of turning-on some variant of the night-time lights). Compelling stuff, IMO!

Don

Dana, Don

Disconnecting pin 9 at the head-light switch just made the car turn on the low-beams and the tail-lights

Disconnecting pin 9 made the car act the same as if the entire headlight switch was not plugged in

Thank you both for your help

Also, Don, where do you get your WDs from? The WD I got from erWin does not show the internal wires of the light switch. It shows me the lamps and the switches but not the wire connections or the wire connections to the terminals
 
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DV52

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^^^gokarty: the amount of intra-switch information on erWin WD s seems to vary with the particular car and with the specific model: some WD s simply show the LDS as a "black-box", while others are more generous in their depiction of the inner working of the part.

I have no idea how those in the "Vaterland" decide which approach to adopt (I learnt long ago that the will of these omnipotent deities is well beyond the fragile reasoning of our feeble minds! ;))

Don
 
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