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Thread: Will a dead key fob stop the car from starting?

  1. #1
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    Will a dead key fob stop the car from starting?

    My wife has our B8 Audi A4 several hours away, and the car won't start, won't crank, nothing. When the key is pushed in to turn on the ignition, no lights come on except a parking brake light, which turns off after a few minutes, the rear interior lights are on, and one brake light is on. Random. I can't pull a scan because I'm not there, but any thoughts?

    I've had issues with the door locks and 12v sockets not powering, and have attributed those to the J393 Control Module possibly going bad. Could that thing cause the no start and funky light situation I listed above?

    Thank you

  2. #2
    Verified VCDS User Zenerdiode's Avatar
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    If it won't start, it won't start - so she'll have to get recovered. Obviously without a scan, as you've mentioned, we're snookered.

    One thing I can add, is what do you mean by a dead key fob? Do you mean a dead battery within the fob? The battery is not required to release the immobiliser when starting from the receptacle. Is the vehicle battery flat? It sounds like something awry with the BCM2 but that's no more than speculation at this time.

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  4. #3
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    Battery has 12.6v so I’ve eliminated that. I did mean the key fob battery, but the funky electronical issues eliminate that. On to bigger things...

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    Verified VCDS User iichel's Avatar
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    Address 46 (J393 Convenience module) is in some cases part of the immobiliser. If this module has gone bad, it could activate the immobiliser.

  6. #5
    Verified VCDS User Zenerdiode's Avatar
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    Quote Originally Posted by iichel View Post
    Address 46 (J393 Convenience module) is in some cases part of the immobiliser. If this module has gone bad, it could activate the immobiliser.
    It is, Michel. The BCM2 does indeed have both 46-Central Convenience and 05-Access/Start Authorisation together in the same physical box.

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  8. #6
    Benevolent Dictator Uwe's Avatar
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    No, a dead key-fob battery should not prevent the car from starting if the key is inserted in the lock, or on those cars that lack such a lock, is held of against the receptor/antenna pad that is somewhere on the dash.

    -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.

  9. #7
    Verified VCDS User iichel's Avatar
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    A dead key fob is something different than a key fob with a dead battery. Just to be sure we're not mixing stuff up.

  10. #8
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    Quote Originally Posted by iichel View Post
    Address 46 (J393 Convenience module) is in some cases part of the immobiliser. If this module has gone bad, it could activate the immobiliser.
    Update: J393 failed. I had to have it replaced/recoded which brought everything back. Actually, the source of the problem was blocked sunroof drains, which flooded that rear fuse/J393 area. That was a spendy fix. Apparently the drains were cleared but it's raining out today and can't help but thing what might be happening.

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  12. #9
    NostraJackAss Jack@European_Parts's Avatar
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    Did you bag J393 with a snorkel tube and service loop?

    A little forethought goes a long way

    Final & first auto-scan?
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  14. #10
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    Quote Originally Posted by Jack@European_Parts View Post
    Did you bag J393 with a snorkel tube and service loop?

    A little forethought goes a long way

    Final & first auto-scan?
    Hahaha. I should drill some drain holes in there. Here is the post scan result. I am still tracing this door lock issue (no chirp, auto-lock triggering): https://forums.ross-tech.com/showthr...r-fault-faults

    Code:
    Sunday,02,September,2018,21:40:00:02305
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 18.2.1.2 (x64)  HEX-V2 CB: 0.4411.4
    Data version: 20180518 DS287.1
    www.Ross-Tech.com
    
    
    VIN: XXXXXXXXXXXXXXXXX   License Plate: 
    Mileage: 184580km-114692mi   Repair Order: 
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: 8K-AU48 (8T0)
    Scan: 01 02 03 05 08 09 15 16 17 19 42 46 47 52 53 56 62 65 72 77
             
    
    VIN: XXXXXXXXXXXXXXXXX   Mileage: 184580km-114692miles
    
    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: OK 0000
    08-Auto HVAC -- Status: OK 0000
    09-Cent. Elect. -- Status: OK 0000
    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: OK 0000
    46-Central Conv. -- Status: Malfunction 0010
    47-Sound System -- Status: Malfunction 0010
    52-Door Elect, Pass. -- Status: OK 0000
    53-Parking Brake -- Status: OK 0000
    56-Radio -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    65-Tire Pressure -- Status: Malfunction 0010
    72-Door, Rear Right -- Status: Malfunction 0010
    77-Telephone -- Status: OK 0000
    -------------------------------------------------------------------------------
    Address 01: Engine (DL0MA-CAEB)       Labels:| 06H-907-115-CAB.clb
       Part No SW: 8K2 907 115 AL    HW: 8K2 907 115 D
       Component: 2.0l R4/4V TF H14 0001  
       Revision: E1H14---    
       Coding: 010C010A190F0160
       Shop #: WSC 40832 444 999999
       ASAM Dataset: EV_ECM20TFS0118K2907115AL 001001
       ROD: EV_ECM20TFS0118K2907115AL.rod
       VCID: 79AF101F6959C2DF369-802C
    
    No fault code found.
    Readiness: 0000 0000
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans (J217)       Labels:| 0B6-927-156.clb
       Part No SW: 8K0 927 158 C    HW: 0B6 927 156 
       Component: 0B6 20TFSIUSA H04 0050  
       Revision: --H04---    
       Coding: 001002
       Shop #: WSC 06335 000 00000
       ASAM Dataset: EV_TCMAL651 A01004
       ROD: EV_TCMAL651.rod
       VCID: 3635DB2318C7EDA79BB-8062
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes (J104)       Labels:. 8K0-907-379-V1.clb
       Part No SW: 8K0 907 379 AB    HW: 8K0 907 379 AB
       Component: ESP8 quattro  H04 0060  
       Revision: --------    Serial number: --------------
       Coding: 150500
       Shop #: WSC 06335 000 00000
       VCID: 79AF101F69D9C2DF369-802C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
       Part No SW: 8K0 907 064 CS    HW: 8K0 907 064 CS
       Component: BCM2 2.0      H07 0437  
       Revision: 00002001    
       Coding: 090200
       Shop #: WSC 00612 002 1048576
       VCID: 035372F71B15880F6C5-8056
    
       Subsystem 1 - Part No SW: 8T0 959 754 A    HW: 8T0 959 754 A
       Component: FBSAUDIB8 IDG  H37 0060 
       Serial number: 0508000057866019    
    
       Subsystem 2 - Part No SW: 8K0 905 852 D    HW: 8K0 905 852 D
       Component: ELVAUDIB8  H36 0041 
       Serial number: 0208000071974008    
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J255)       Labels: Redir Fail!
       Part No SW: 8T1 820 043 AA    HW: 8T1 820 043 AA
       Component: KLIMA 1 ZONE  H06 0140  
       Revision: A1000000    Serial number: 0106.10.080892
       Coding: 64002000
       Shop #: WSC 06335 000 00000
       VCID: 70B92D3B3AA38397817-8024
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. (J519)       Labels:. 8K0-907-063.clb
       Part No SW: 8K0 907 063 D    HW: 8K0 907 063 D
       Component: BCM1 1.0      H22 0253  
       Revision: 05022001    Serial number: 00000000242883
       Coding: 690000B1063C00010000080300007F5F0F14460800000001000000
       Shop #: WSC 06335 000 00000
       VCID: 3039ED3BFA23C397C17-8064
    
       Subsystem 1 - Part No SW: 8K1 955 119 A    HW: 8T1 955 119   Labels: 1KX-955-119.CLB
       Component: WWS 011008  H06 0070 
       Serial number: SWF08100016732      
       Coding: 00FD11
    
       Subsystem 2 - Part No SW: 8K0 941 531 F    HW: 8K0 941 531 F
       Component: E1 - LDS  H07 0070 
       Serial number: 00000000002909081354
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags (J234)       Labels:| 8K0-959-655.clb
       Part No SW: 8K0 959 655 F    HW: 8K0 959 655 F
       Component: AirbagVW-AU10 H27 0410  
       Serial number: 0039KD149H9%  
       Coding: 303836354230303030304A55304C384B3053
       Shop #: WSC 06335 000 00000
       ASAM Dataset: EV_AirbaECUVWAUDI010 A02007
       ROD: EV_AirbaECUVWAUDI010_A02.rod
       VCID: 40D9BDFB4A035317317-8014
    
       Seat occupied recognition: 
       Subsystem 1 - Part No SW: 8K0 959 339 B    HW: 8K0 959 339 B
       Component: BF-Gewichtss.  H01 0030 
       Serial number: 5810000R0800001AX2
    
       Crash sensor for side airbag: driver side: 
       Serial number: 6334MSME40350507/
    
       Crash sensor for side airbag: front passenger side: 
       Serial number: 6344MSME432108743
    
       Crash sensor for side airbag: rear: driver side: 
       Serial number: 6352QSME7B0E523AT
    
       Crash sensor for side airbag: rear: passenger side: 
       Serial number: 6362QSME4D10401AB
    
       Crash sensor for front airbag: driver side: 
       Serial number: 63732SME5B10483C0
    
       Crash sensor for front airbag: front passenger side: 
       Serial number: 63832SME4B115320R
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel (J527)       Labels:. 8K0-953-568.clb
       Part No SW: 8K0 953 568 F    HW: 8K0 953 568 F
       Component: Lenks.Modul   H13 0013  
       Revision: --------    Serial number: 90319HJ3000CU 
       Coding: 000017
       Shop #: WSC 00612 002 104857
       VCID: 3D27C40F3D713EFF5A1-8068
    
       Component: E221 - MFL  H02 0003 
    
    1 Fault Found:
    01044 - Control Module Incorrectly Coded 
                000 -  -  - Intermittent
                 Freeze Frame:
                        Fault Status: 00100000
                        Fault Priority: 3
                        Fault Frequency: 254
                        Reset counter: 219
                        Mileage: 183542 km
                        Time Indication: 0
                        Date: 2018.08.20
                        Time: 15:03:00
    
    
    -------------------------------------------------------------------------------
    Address 17: Instruments (J285)       Labels:. 8T0-920-xxx-17.clb
       Part No SW: 8K0 920 950 A    HW: 8K0 920 950 A
       Component: KOMBIINSTR.   H17 0224  
       Revision: 00000000    Serial number: 9DR3526A8     
       Coding: 831E11000300D705020000
       Shop #: WSC 00612 002 104857
       VCID: 2D07F44FED11AE7FEA1-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway (J533)       Labels:. 8T0-907-468.clb
       Part No SW: 8T0 907 468 H    HW: 8T0 907 468 H
       Component: GW-BEM 5CAN   H06 0094  
       Revision: 4GB20042    Serial number: 4200G089258155
       Coding: 000303
       Shop #: WSC 06335 000 00000
       VCID: 46D5ABE368A77D270BB-8012
    
       Subsystem 1 - Part No SW: 8K0 915 181 B    HW: 8K0 915 181 B
       Component: J367-BDM  H04 0150 
       Serial number: 18048AFC200908      
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver (J386)       Labels:. 8K0-959-793.clb
       Part No SW: 8K0 959 793 B    HW: 8K0 959 793 
       Component: TSG FA        H10 0170  
       Revision:             Serial number: 0000007770700 
       Coding: 011C03204000410001
       Shop #: WSC 06335 000 00000
       VCID: 3FDBBE07377D2CEF48D-806A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv. (J393)       Labels:. 8K0-907-064-46.clb
       Part No SW: 8K0 907 064 CS    HW: 8K0 907 064 CS
       Component: BCM2 2.0      H07 0437  
       Revision: 00002001    Serial number: 0414121207    
       Coding: 0126023A207A001400B0020000000000
       Shop #: WSC 00612 002 1048576
       VCID: 035372F71B15880F6C5-8056
    
       Subsystem 1 - Part No: 1K0 951 605 C
       Component: LIN BACKUP HO  H03 1301 
    
       Subsystem 2 - Part No SW: 8K0 959 591     HW: 8K0 959 591 
       Component: J245 PS127  H06 0037 
    
       Subsystem 3 - Part No SW: 8K0 959 591     HW: 8K0 959 591 
       Component: J394 PS222  H06 0037 
    
    2 Faults Found:
    02615 - Fuel Tank Cap; Lock 
                009 - Open or Short to Ground
                 Freeze Frame:
                        Fault Status: 01101001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Reset counter: 164
                        Mileage: 183542 km
                        Time Indication: 0
                        Date: 2018.08.20
                        Time: 15:38:52
    
    02616 - Fuel Tank Cap; Unlock 
                009 - Open or Short to Ground
                 Freeze Frame:
                        Fault Status: 01101001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Reset counter: 164
                        Mileage: 183542 km
                        Time Indication: 0
                        Date: 2018.08.20
                        Time: 16:01:54
    
    
    -------------------------------------------------------------------------------
    Address 47: Sound System (J525)       Labels:. 8T0-035-223-ASC.clb
       Part No SW: 8T0 035 223 AB    HW: 8T0 035 223 
       Component: DSP STD       H07 0220  
       Revision: S2100000    
       Coding: 0203010102
       Shop #: WSC 06335 000 00000
       VCID: 6E8533432097956793B-803A
    
    1 Fault Found:
    00417 - Left Front DSP Mid-Bass Speaker (R101) 
                011 - Open Circuit
                 Freeze Frame:
                        Fault Status: 01101011
                        Fault Priority: 5
                        Fault Frequency: 9
                        Reset counter: 194
                        Mileage: 183544 km
                        Time Indication: 0
                        Date: 2018.08.20
                        Time: 17:21:19
    
                 Freeze Frame:
                        Voltage: 10.60 V
                        Temperature: 29.0°C
                        Bin. Bits: 00000001
    
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass. (J387)       Labels:. 8K0-959-792.clb
       Part No SW: 8K0 959 792 B    HW: 8K0 959 792 
       Component: TSG BF        H10 0170  
       Revision:             Serial number: 0000007879759 
       Coding: 011C03204000410001
       Shop #: WSC 00612 002 1048576
       VCID: 3E25C303307725E743B-806A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 53: Parking Brake (J540)       Labels: 8K0-907-801-V1.clb
       Part No SW: 8K0 907 801 E    HW: 8K0 907 801 E
       Component: EPB Audi B8   H05 0060  
       Revision: 00000003    Serial number: 00000000238339
       Shop #: WSC 00000 000 00000
       VCID: 313FE83FF129CA9FCE9-8064
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio (J503)       Labels:. 8Tx-035-1xx-56.clb
       Part No SW: 8T1 035 195 L    HW: 8T1 035 195 L
       Component: Symph3 Sirius H02 0211  
       Revision: 00000004    Serial number: AUZ5Z4H1051362
       Coding: 05020002010285004159070000
       Shop #: WSC 00612 002 104857
       VCID: 40D9BDFB4A835317317-8014
    
       Subsystem 1 - Part No SW: 8T0 919 603 A    HW: 8T0 919 603 A
       Component: Display  
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left (J388)       Labels:. 8K0-959-795.clb
       Part No SW: 8K0 959 795 A    HW: 8K0 959 795 A
       Component: TSG HL        H06 0170  
       Revision:             Serial number: 0000007815169 
       Coding: 010C03204000210001
       Shop #: WSC 06335 000 00000
       VCID: 40D9BDFB4A835317317-8014
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 65: Tire Pressure (J502)       Labels:. 8K0-907-273.clb
       Part No SW: 8K0 907 273 A    HW: 8K0 907 273 A
       Component: J502-RDK      H03 0250  
       Revision: 00001001    Serial number: 13140781839473
       Coding: 0CD154
       Shop #: WSC 06334 000 00000
       VCID: 3039ED3BFA23C397C17-8064
    
    1 Fault Found:
    02214 - Tire Pressure Warning 
                000 -  -  - Intermittent
                 Freeze Frame:
                        Fault Status: 00100000
                        Fault Priority: 1
                        Fault Frequency: 3
                        Reset counter: 232
                        Mileage: 184444 km
                        Time Indication: 0
                        Date: 2018.09.01
                        Time: 09:12:16
    
                 Freeze Frame:
                            73.85
                        Bin. Bits: 00001000 00100101
                        Voltage: 13.70 V
                        Text:  19,0°C; -0,90bar;3443110259;00h; 17°C
    
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right (J389)       Labels:. 8K0-959-794.clb
       Part No SW: 8K0 959 794 A    HW: 8K0 959 795 A
       Component: TSG HR        H06 0170  
       Revision:             Serial number: 0000007912630 
       Coding: 010C03204000210001
       Shop #: WSC 06335 000 00000
       VCID: 3FDBBE07377D2CEF48D-806A
    
    1 Fault Found:
    02115 - Locking Unit for Central Locking 
                008 - Implausible Signal
                 Freeze Frame:
                        Fault Status: 01101000
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 164
                        Mileage: 183542 km
                        Time Indication: 0
                        Date: 2018.08.20
                        Time: 15:38:13
    
    
    -------------------------------------------------------------------------------
    Address 77: Telephone        Labels: 8P0-862-335.lbl
       Part No SW: 8T0 862 336 C    HW: 8T0 862 336 C
       Component: FSE_256x BT     H33 0550  
       Revision: 00000000    Serial number: 00000005021039
       Coding: 0010370
       Shop #: WSC 06335 000 00000
       VCID: 3B23CA172F6530CF645-806E
    
    No fault code found.
    
    End----(Elapsed Time: 01:36, VBatt start/end: 11.9V/11.9V. VIgn 11.9V)-----

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