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Thread: 2015 MK7 Golf Sportwagen Fog Lights

  1. #1
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    2015 MK7 Golf Sportwagen Fog Lights

    I have installed my foglights but now need to code them. I used pins C3 (Leuchte17TFL R BLK SRB3TFL R BLK SRKC3) and C9 (Leuchte16BLK SLB25BLK SL KC9) on the BCM/CECM but am having a hard time coding it in. Pins B5 and B45 are not on my BCM, so I am using a different channel. Initially I was going to use the front side marker lights but would prefer not to lose that function.

    My CECM part number is 5Q0 937 087 Q, is it even possible to have foglights with this or should I just buy a different CECM?

    I am using HEX+CAN with VCDS 18.1

  2. #2
    Benevolent Dictator Uwe's Avatar
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    It would be appropriate to post an Auto-Scan for context here.

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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  4. #3
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    Sorry, I meant to follow up but I got distracted by reading a manual.

    Code:
    Saturday,30,December,2017,15:13:22:46754
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 17.12.0.1 (x64)
    Data version: 20171213 DS285.1
    www.Ross-Tech.com
    
    
    VIN: 3VWC17AU3FM516313   License Plate: 
    
    
    Chassis Type: AU-VW37 (5Q0)
    Scan: 01 02 03 08 09 15 16 17 19 42 44 52 5F 75
    
    VIN: 3VWC17AU3FM516313   Mileage: 41078km-25524miles
    
    01-Engine -- Status: OK 0000
    02-Auto Trans -- Status: Malfunction 0010
    03-ABS Brakes -- Status: Malfunction 0010
    08-Auto HVAC -- Status: OK 0000
    09-Cent. Elect. -- Status: Malfunction 0010
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: Malfunction 0010
    17-Instruments -- Status: OK 0000
    19-CAN Gateway -- Status: OK 0000
    42-Door Elect, Driver -- Status: Malfunction 0010
    44-Steering Assist -- Status: OK 0000
    52-Door Elect, Pass. -- Status: OK 0000
    5F-Information Electr. -- Status: Malfunction 0010
    75-Telematics -- Status: OK 0000
     
    -------------------------------------------------------------------------------
    Address 01: Engine (J623-CXBB)       Labels:. 06K-907-425-V1.clb
       Part No SW: 5GM 906 264     HW: 06K 907 425 B
       Component: 1.8l R4 TFSI  H13 0001  
       Revision: --H13---    
       Coding: 091A00122424002F0000
       Shop #: WSC 00066 790 00218
       ASAM Dataset: EV_ECM18TFS0205GM906264 001001
       ROD: EV_ECM18TFS0208V0906264F.rod
       VCID: 0407FD108FADBD0AEBA-8050
    
    No fault code found.
    Readiness: 0000 0000
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans (J217)       Labels: 09G-927-749-V2.clb
       Part No SW: 09G 927 749 D    HW: 09G 927 749 D
       Component: AISIN AG6 G3  129 2866  
       Coding: 010200000C000000000000000000000000000000
       Shop #: WSC 00066 790 00218
       ASAM Dataset: EV_TCMAQ250031 002009
       ROD: EV_TCMAQ250031_002_VW25.rod
       VCID: 3A7B43E8BDE93BFAC16-806E
    
    1 Fault Found:
    28269 - Gear Selector 
              P17C5 00 [104] - Implausible Signal
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 4
                        Fault Frequency: 1
                        Reset counter: 39
                        Mileage: 38935 km
                        Date: 2017.12.14
                        Time: 16:39:23
    
                        Engine speed: 922.0 /min
                        Transmission input speed: 909 /min
                        Transmission output speed: 0 /min
                        Engine torque: -4 Nm
                        Transmission fluid temperature: 64 °C
                        Accelerator position: 0.0 %
                        Clutch_C1: Open
                        Clutch_C2: Open
                        Clutch_C3: Open
                        Clutch_C4: Open
                        Clutch_B1: Open
                        Clutch_B2: Open
                        Lock Up Clutch: Open
                        Electrical Oil Pump target revolution: 65534 /min
                        Electrical Oil Pump actual revolution: 65279 /min
                        Engine Speed signal Current: 65279 /min
                        Electrical Oil Pump failure status with Electrical Oil Pump without HV 1: Motor normal stop
                        Electrical Oil Pump target current: 65278 mA
    
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes (J104)       Labels:. 5Q0-907-379-ESP-V1.clb
       Part No SW: 3Q0 907 379 P    HW: 3Q0 907 379 C
       Component: ESC           H32 0385  
       Revision: 00000000    Serial number: 50875000000483
       Coding: 04FA6AA124210972007A020181C6292056249000408194B400430050C002
       Shop #: WSC 01383 790 50316
       ASAM Dataset: EV_Brake1UDSContiMK100ESP 034033
       ROD: EV_Brake1UDSContiMK100ESP_034_VW37.rod
       VCID: 479D2A1CFE1B56124E8-8012
    
    1 Fault Found:
    16401 - Tire Pressure Warning 
              C102D 00 [008] -  - 
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Reset counter: 139
                        Mileage: 32882 km
                        Date: 2017.09.15
                        Time: 17:37:32
    
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J301)       Labels:| 5G0-907-426.clb
       Part No SW: 5GM 907 426     HW: 5GM 907 426 
       Component: AC Manuell    H02 1001  
       Revision: 00001K01    
       Coding: 02020004100100000000000000000000
       Shop #: WSC 01383 790 50316
       ASAM Dataset: EV_ACManueBHBVW37X 003019
       ROD: EV_ACManueBHBVW37X_003_VW37.rod
       VCID: 0501E01484978402FC4-8050
    
       Fresh Air Blower Front: 
    
       Refrigerant Pressure And Temperature Sender: 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. (J519)       Labels:| 5Q0-937-08X-BV1.clb
       Part No SW: 5Q0 937 087 Q    HW: 5Q0 937 087 Q
       Component: BCM PQ37BOSCH 028 0145  
       Revision: --------    Serial number: 86583003150003
       Coding: 000018424041804169E44000000403001000000000000000000000000000
       Shop #: WSC 00066 790 07031
       ASAM Dataset: EV_BodyContrModul1UDSBosc 014004
       ROD: EV_BCMBOSCH_014.rod
       VCID: 49992C24E80FA06258C-801C
    
       Control Unit For Wiper Motor: 
       Subsystem 1 - Part No SW: 5GM 955 119     HW: 5GM 955 119   Labels: 5QX-955-119-V1.CLB
       Component: WWS    150403  043 0581 
       Serial number:         150521102520
       Coding: 0E4DDD
    
    2 Faults Found:
    919560 - Light Switch 
              B126A 29 [136] - Signal Implausible
              MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
    
    329480 - Heated Passenger Seat 
              U95C050 F0 [008] - Safety Shut-Off due to Occupant Detection
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 6
                        Fault Frequency: 126
                        Reset counter: 116
                        Mileage: 12219 km
                        Date: 2016.10.04
                        Time: 11:39:33
    
    
    -------------------------------------------------------------------------------
    Address 15: Airbags (J234)       Labels:| 5Q0-959-655.clb
       Part No SW: 5Q0 959 655 J    HW: 5Q0 959 655 J
       Component: AirbagVW20    009 0825  
       Serial number: 003GCR01LNV5
       Coding: 8CCCFC00000000005000001AC24800000065
       Shop #: WSC 01383 790 50316
       ASAM Dataset: EV_AirbaVW20SMEVW37X 002138
       ROD: EV_AirbaVW20SMEVW37X_VW37.rod
       VCID: 479D2A1CFE1B56124E8-8012
    
       Occupant Detection: 
       Subsystem 1 - Part No SW: 4M0 959 339 B    HW: 4M0 959 339 B
       Component: BF-Gewichtss.  H11 0021 
       Serial number: IBH0000J150002PRED0N
       Coding: 303138
    
       Side Sensor Driver Front: 
       Subsystem 2 - Part No SW: -----------    HW: 480 003 003 15
       Component: SideSensor_Df  001 0887 
       Serial number: 35700000000DCCFCE31B
       Coding: 2D2D2D
    
       Side Sensor Passenger Front: 
       Subsystem 3 - Part No SW: -----------    HW: 480 002 603 15
       Component: SideSensor_Pf  001 0887 
       Serial number: 35800000000C2951931F
       Coding: 2D2D2D
    
       Side Sensor Driver Rear: 
       Subsystem 4 - Part No SW: -----------    HW: 480 403 103 15
       Component: SideSensor_Dr  001 6149 
       Serial number: 3510002C51941315D11O
       Coding: 2D2D2D
    
       Side Sensor Passenger Rear: 
       Subsystem 5 - Part No SW: -----------    HW: 480 403 103 15
       Component: SideSensor_Pr  001 6149 
       Serial number: 3520002A31A878548381
       Coding: 2D2D2D
    
       Front Sensor Driver: 
       Subsystem 6 - Part No SW: -----------    HW: 480 400 104 15
       Component: FrontSensor_D  001 6149 
       Serial number: 3550002AB1A14CA2035+
       Coding: 2D2D2D
    
       Front Sensor Passenger: 
       Subsystem 7 - Part No SW: -----------    HW: 480 400 104 15
       Component: FrontSensor_P  001 6149 
       Serial number: 3560002AB1A14CA5F2CN
       Coding: 2D2D2D
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel (J524)       Labels:| 5Q0-953-549.clb
       Part No SW: 5Q0 953 521 P    HW: 5Q0 953 569 A
       Component: Lenks.Modul   075 0175  
       Revision: FF032032    Serial number: 20150327500211
       Coding: 0410
       Shop #: WSC 66564 385 16448
       ASAM Dataset: EV_SMLSVALEOMQB 001015
       ROD: EV_SMLSVALEOMQB.rod
       VCID: 3F8D32FCA6CB1ED2F68-806A
    
    1 Fault Found:
    617752 - Selector Lever Park Position Lock Switch 
              B1162 29 [008] - Signal Implausible
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 4
                        Reset counter: 107
                        Mileage: 37828 km
                        Date: 2017.11.30
                        Time: 16:37:03
    
                        Ubat 30 Voltage: 14.10 V
                        Ignition State: On
                        Terminal 15: 13.30 V
                        A/D #1: 0.00 %
                        A/D #2: 0.00 %
                        A/D #3: 0.00 %
    
    
    -------------------------------------------------------------------------------
    Address 17: Instruments (J285)       Labels:| 5G0-920-XXX-17.clb-SRI3
       Part No SW: 5G1 920 840     HW: 5G1 920 840 
       Component: KOMBI         243 4270  
       Coding: 0BB5110A2180CF0502086A001000000000000000
       Shop #: WSC 00066 790 00218
       ASAM Dataset: EV_DashBoardVDDMQBAB 009037
       ROD: EV_DashBoardVDDMQBAB_009_VW37.rod
       VCID: 64C7DD906FED1D0A4BA-8030
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway (J533)       Labels:| 5Q0-907-530-V1.clb
       Part No SW: 5Q0 907 530 AB    HW: 5Q0 907 530 L
       Component: GW MQB Mid    211 2203  
       Revision: --------    Serial number: 30041510000556
       Coding: 0101000820085900FF0000081C0F00000001050000000000000000000000
       Shop #: WSC 00066 790 07027
       ASAM Dataset: EV_GatewConti 011020
       ROD: EV_GatewConti_011_VW37.rod
       VCID: 71E9A4C4A01FB8A230C-8024
    
       Alternator: 
    
       Multi Function Steering Wheel Control Module: 
       Subsystem 2 - Part No SW: 5G0 959 442 P    HW: 5G0 959 442 P  Labels: 3C8-959-537.CLB
       Component: E221__MFL-DC1  H16 0101 
       Serial number: 27140002727850095154
       Coding: 31FFFF
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver (J386)       Labels:| 5QX-959-X93-42.clb
       Part No SW: 5Q0 959 393 B    HW: 5Q0 959 393 B
       Component: TSG FS        020 0025  
       Serial number: 18051506050GBN
       Coding: 003003200000040000000000
       Shop #: WSC 01383 790 50316
       ASAM Dataset: EV_DCUDriveSideEWMINKLO 006003
       ROD: EV_DCUDriveSideEWMAXCONT.rod
       VCID: 3E734FF8A1C117DAFDE-806A
    
       Drivers Door Rear Control Module: 
       Subsystem 1 - Part No SW: 5Q4 959 811 D    HW: 5Q4 959 811 D  Labels: 5QX-959-81X-V1.CLB
       Component: Fond FHSG DRV  007 0002 
       Serial number: 00000000000001182805
       Coding: 011000
    
    1 Fault Found:
    65588 - Motor for Window Regulator 
              B1487 54 [008] - Missing Calibration / Basic Setting
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 89
                        Mileage: 39911 km
                        Date: 2017.12.18
                        Time: 07:33:45
    
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist (J500)       Labels:| 5Q0-909-144.clb
       Part No SW: 5Q0 909 144 R    HW: 5Q0 909 144 R
       Component: EPS_MQB_ZFLS  126 1061  
       Coding: 0102
       Shop #: WSC 00066 790 00218
       ASAM Dataset: EV_SteerAssisMQB 012140
       ROD: EV_SteerAssisMQB_012_VW37.rod
       VCID: 43853E0CCA237A32920-8016
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass. (J387)       Labels:| 5QX-959-X92-52.clb
       Part No SW: 5Q0 959 392 B    HW: 5Q0 959 392 B
       Component: TSG BFS       020 0025  
       Serial number: 1505150605098O
       Coding: 003003208C00040000000000
       Shop #: WSC 01383 790 50316
       ASAM Dataset: EV_DCUPasseSideEWMINKLO 006003
       ROD: EV_DCUPasseSideEWMAXCONT.rod
       VCID: 3D7148F4ACC70CC2E44-8068
    
       Passengers Rear Door Control Module: 
       Subsystem 1 - Part No SW: 5Q4 959 812 D    HW: 5Q4 959 812 D  Labels: 5QX-959-81X-V1.CLB
       Component: Fond FHSG PSG  007 0002 
       Serial number: 00000000000001160412
       Coding: 091000
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 5F: Information Electr. (J794)       Labels:| 5G0-035-MIB-STD1.clb
       Part No SW: 5G0 035 844     HW: 5G0 035 844 
       Component: MU-S-S-US     014 0655  
       Serial number: V7B01504153511
       Coding: 02730200FF00000021220001001800001F0100040100010002
       Shop #: WSC 47844 001 1048576
       ASAM Dataset: EV_MUStd4CPASE 002040
       ROD: EV_MUStd4CPASE_VW37.rod
       VCID: 64C7DD906FED1D0A4BA-8030
    
       Operating And Display Unit 1: 
       Subsystem 1 - Part No SW: 5G0 919 605 H    HW: 5G0 919 605 H
       Component: ABT_Std_Plus  H60 0030 
       Serial number: VWZ8Z9RS501QCL      
    
    1 Fault Found:
    0020 - Tuner for Satelite Radio 
              B11CF 53 [009] - Deactivated
              Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 4
                        Fault Frequency: 1
                        Reset counter: 182
                        Mileage: 12200 km
                        Date: 2016.10.03
                        Time: 21:11:48
    
                        Voltage terminal 30: 11.9 V
                        Satellite radio tuner status-Satellite radio antenna status: Electrical OK
                        Satellite radio tuner status-Channel selection for satellite radio: 0
                        Satellite radio tuner status-Audio Signal: Not available
                        Satellite radio tuner status-Antenna current: 0 mA
                        Satellite radio tuner status-Reception quality: Not available
                        Satellite radio tuner status-SDARS Flash Regional code: US_Audio_Traffic_Travellink
    
    
    -------------------------------------------------------------------------------
    Address 75: Telematics (J949)       Labels:| 5QE-035-285.clb
       Part No SW: 5QE 035 285 A    HW: 5QE 035 285 A
       Component: OCULowMQBUS   007 0564  
       Coding: 02730202C2821A017F1E06000000
       Shop #: WSC 00066 790 00323
       ASAM Dataset: EV_OCULowMQB 001003
       ROD: EV_OCULowMQB.rod
       VCID: 43853E0CCA237A32920-8016
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 03:25)--------------------------

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  6. #4
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    I was able to get the bulbs to function but as soon as I drive away the fog lights will blink then stay off and then I get an error message on the dash and the "CAR" menu in the center display.

    Here is the adaptations and what I have changed:

    Code:
    C9 - Lasstyp set to 23 allgemeine Scheinwerfer
    C9 - Lampendefektbitposition set to 38
    C9 - Fehlerort mittleres Byte DTC-DFCC set to 22
    C9 - Lichtfunktion A - Set to Nebellicht links
    C9 - Lichtfunktion B - Set to Abbiegelicht links
    C9 - Lichtfunktion C through H - Set to Not Active
    C9 - Dimmwert AB - Set to 100
    C9 - Dimming Direction AB - Set to maximize
    C9 - Dimmwert CD, EF, GH - Set to 0
    C9 - Lichtansteuerung HD AB - Set to Always
    
    C3 - Lasstyp set to 23 allgemeine Scheinwerfer
    C3 - Lampendefektbitposition set to 42
    C3 - Fehlerort mittleres Byte DTC-DFCC set to 23
    C3 - Lichtfunktion A - Set to Nebellicht rechts
    C3 - Lichtfunktion B - Set to Abbiegelicht rechts
    C3 - Lichtfunktion C through H - Set to Not Active
    C3 - Dimmwert AB - Set to 100
    C3 - Dimmwert CD, EF, GH - Set to 0
    C3 - Lichtansteuerung HD AB - Set to Always
    Here is the snippet from a scan after the fault codes show up:

    Code:
    8711 - Bulb for Left Fog Lamp 
              B121F 11 [009] - Short to Ground
              Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 4
                        Fault Frequency: 2
                        Reset counter: 157
                        Mileage: 43858 km
                        Date: 2018.02.11
                        Time: 20:56:59
    
    8967 - Bulb for Right Fog Lamp 
              B1220 11 [008] - Short to Ground
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 4
                        Fault Frequency: 2
                        Reset counter: 197
                        Mileage: 43858 km
                        Date: 2018.02.11
                        Time: 20:56:59
    Last edited by Chimuel; 02-11-2018 at 09:07 PM.

  7. #5
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    ^^^ I'm guessing, but (Leuchte17TFL R BLK SRB3TFL R BLK SRKC3) and C9 (Leuchte16BLK SLB25BLK SL KC9) are factory set to operate ONLY for LED tail-light fittings (they are the inner turn-signal Leuchte-sets). These 2 x Leuchte-sets are not intended for incandescent lamps. Have you installed LED front fogs or incandescent? If the latter - I wonder if the threashold settings for lamp monitoring can accomodate the higher currents?

    If your retro-fitted fogs are LED, try changing Lasstyp to 6 - LED Lichtmodul.

    Don
    Last edited by DV52; 02-12-2018 at 01:05 AM.
    VW Golf MkVII (103TSI) my13

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  9. #6
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    Quote Originally Posted by DV52 View Post
    ^^^ I'm guessing, but (Leuchte17TFL R BLK SRB3TFL R BLK SRKC3) and C9 (Leuchte16BLK SLB25BLK SL KC9) are factory set to operate ONLY for LED tail-light fittings (they are the inner turn-signal Leuchte-sets). These 2 x Leuchte-sets are not intended for incandescent lamps. Have you installed LED front fogs or incandescent? If the latter - I wonder if the threashold settings for lamp monitoring can accomodate the higher currents?

    If your retro-fitted fogs are LED, try changing Lasstyp to 6 - LED Lichtmodul.

    Don
    Good idea... I only have incandescent bulbs in there for the moment but I guess I'll be upgrading to LEDs sooner than planned! It does seem like a circuit protection scheme is superseding my settings (which I expect since like you said this particular circuit is for LED lights).

    The LED bulbs I ordered have a "black box" attached to a wire that goes to the LED on one end and the other end goes to the regular plug, do I need to change the Lasstyp to 6- LED if I install that type of bulb?

    Don, I am very thankful for your thorough documentation... it helped me understand the lighting settings much better!

  10. #7
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    ^^^ "black box"? hmm..... normally LEDs have a simple series resistor as ballast for electrical current flow. Yours sounds like they might have a constant current ciruit (very fancy).

    Here's the factory wattage numbers for an OEM LED tail light fitting.



    As you can see, "Section 2" has a LED cluster with a load of 5.5 Watts for the inner turn signal. So, I suspect that the lamp monitoring ciruit in the BCM for pins #3 & #9 on the C socket is tailored for this electrical load.

    I suggest that you make sure that your LED fog lamps have a watt value around this number. And yes - change the Lastyp channel to the LED setting

    Don
    VW Golf MkVII (103TSI) my13

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  12. #8
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    Don, the LED bulbs I ordered are these:



    The other circuit I was going to use boxed in red (another user in the golfmk7 forums, Basemodel, used it) was for the NAR front side marker lamps, would you happen to have the watt rating that circuit can handle? I don't want to lose that functionality and I may just go back and switch C3 and C9 to pins B10 and B21.



    I am also trying to avoid adding relays but I think if all the above fails I will install a relay triggered by pins C3 and C9 (assuming they are 12V) for each of the front fogs.

    EDIT: I may be straying off the main topic here but would you also be able to tell me what pin the light in the blue box is linked to? It is a rear side marker light but since I have converted to the RoW outer taillights I no longer have them and would like to use that pin/channel set for LED rear fogs.

    Last edited by Chimuel; 02-12-2018 at 08:27 AM.

  13. #9
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    Chimuel: I must warn (again) that my hypothesis is just that. Your retrofit is "innovative" - I've not heard of anyone doing this before, so I'm just guessing (the BCM has 3 x pin sizes which infer electrical current capacity - I suspect that C3 & C9 are the smallest size pins)

    So a few comments on your last post above. My knowledge of NAR models isn't good but I believe that B10/B21 pins are intended for the orange "parking lights" below the orange reflector on US cars with Halogen lights. I have quite a few "yanky" cars in my database and the Leuchte-sets for these pins are invariably set-up for LED lamps. But I was able to find a NAR admap that had the lasstyp channel set to 8 - allgemeine Glühlampe 12W (2016 Sport Wagon S) for B10/B21. The normal incandescent fog light on a mk7 is a H11 fitting with a 55 Watt lamp. But if you are retrofitting a LED lamp into the fog light base, there does appear to be more headroom in these pins

    As to your suggestion for a relay sub-circuit - you could have the opposite problem (i.e. open-circuit error, instead of short-circuit error). The operating current for the coil in a 12V electo-mechanical relay is typically of the order of 100 milli-amps. The lamp monitoring circuits on C3/C9 may see this small current as an open ciruit - so you might need to add a resistor in parallel with the relay coil to fool the monitoring ciruit. A bit of basic theory: the expected load on C3/C9=5.5 Watts=V^2/R. Assuming a nominal rail voltage of 13V, R=14 ohms. Be aware that the long term heat dissipation of this resistor will be 5.5 Watts, so to keep everything cool, perhaps choose a 20W resistor. The added resistor might not be needed (try without first), but the calculation might be useful if this is not the case.


    Don
    Last edited by DV52; 02-12-2018 at 05:19 PM.
    VW Golf MkVII (103TSI) my13

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  15. #10
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    Quote Originally Posted by DV52 View Post
    Chimuel: I must warn (again) that my hypothesis is just that. Your retrofit is "innovative" - I've not heard of anyone doing this before, so I'm just guessing (the BCM has 3 x pin sizes which infer electrical current capacity - I suspect that C3 & C9 are the smallest size pins)

    So a few comments on your last post above. My knowledge of NAR models isn't good but I believe that B10/B21 pins are intended for the orange "parking lights" below the orange reflector on US cars with Halogen lights. I have quite a few "yanky" cars in my database and the Leuchte-sets for these pins are invariably set-up for LED lamps. But I was able to find a NAR admap that had the lasstyp channel set to 8 - allgemeine Glühlampe 12W (2016 Sport Wagon S) for B10/B21. The normal incandescent fog light on a mk7 is a H11 fitting with a 55 Watt lamp. But if you are retrofitting a LED lamp into the fog light base, there does appear to be more headroom in these pins

    As to your suggestion for a relay sub-circuit - you could have the opposite problem (i.e. open-circuit error, instead of short-circuit error). The operating current for the coil in a 12V electo-mechanical relay is typically of the order of 100 milli-amps. The lamp monitoring circuits on C3/C9 may see this small current as an open ciruit - so you might need to add a resistor in parallel with the relay coil to fool the monitoring ciruit. A bit of basic theory: the expected load on C3/C9=5.5 Watts=V^2/R. Assuming a nominal rail voltage of 13V, R=14 ohms. Be aware that the long term heat dissipation of this resistor will be 5.5 Watts, so to keep everything cool, perhaps choose a 20W resistor. The added resistor might not be needed (try without first), but the calculation might be useful if this is not the case.


    Don
    Don! Thanks for the write up. Amazon pulled through with same-day delivery and now I have fully functional front fog lights! The lights worked when I had Lasstyp set to 10 and Dimmwert was set to 100. I have gone ahead and changed those two settings to Lasstyp 6 and Dimmwert 127 to tidy up the programming.

    C3 and C9 pins are exactly the same size as the B5, B45, B10, and B21 pins so I thought there would be higher headroom for amperage --my wiring harness is OEM with the proper pins.

    I am very glad I did not need to add relays, that was my last resort! --My engineering background would have come in handy but I'm a little rusty after having worked in IT for a few years now.

    Only issue I am running into now is that when I have the light controls pulled to the first detent, after I start driving the fog lights turn off and only turn on to the side I am turning to when I turn the steering wheel. I imagine I set the cornering lights on, should I change the "B" in the AB pair to "not active"?

    Thanks for the insight and responses, much appreciated!

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