Seat belt indicator not showing unbuckled seat belt

   #1  

nhaas

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Last Winter on a super cold night in the Colorado mountains my Airbag light came on. Upon scanning with VCDS I had the following code:

65535 - Internal Control Module Memory Error

VCDS cannot clear this code so I sent my Airbag control module to Airbag Systems in Texas where they we able to clear the DTC. The tech there said he's seen this error thrown in Cold weather. I'm preparing this car for my son in Florida so hopefully it won't happen again! I installed the cleared Airbag module and everything seems fine, but then I noticed that the seatbelt light comes on at startup and then disappears. The car no longer seems to know whether my seatbelt is buckled or not. Has anyone encountered this? Again, there are no fault codes for the Airbag system, but when I went into the measuring blocks I found the following:

Occupied Seat Sensor Pass. Side "Too High"
Belt Inquiry Front Driver Side "Too High"
Belt Inquiry Front Pass. Side "Too High"

This is concerning as I would assume if it's not sensing a passenger, the airbag will not deploy.

Has anyone encountered this? Any advice is much appreciated.

Norbert

PS: If you have suggestions for the Exhaust temp and O2 sensor codes below, I'd love to hear them.

Here's my Scan:

Code:
Saturday,31,July,2021,19:38:46:20629
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.3.0.0 (x64)  HEX-V2 CB: 0.4544.4
Data version: 20210226 DS325.0
www.Ross-Tech.com


VIN:    License Plate: GOLDIE
Mileage: 147299   Repair Order:



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


Chassis Type: 4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005)
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
          75 76 77

-------------------------------------------------------------------------------
Address 01: Engine        Labels: 078-907-551-AZA.lbl
   Part No: 4B0 907 551 L
   Component: 2.7l V6/5VT     G   0003 
   Coding: 06652
   Shop #: WSC 02325 
   VCID: 2D040351A4043733145-513C

5 Faults Found:
17862 - Exhaust Gas Temp Sensor 1 (G235)
            P1454 - 35-00 - Short to Ground
17870 - Exhaust Gas Temp Regulation for Bank 2
            P1462 - 35-10 - Implausible Signal - Intermittent
17864 - Exhaust Gas Temp Regulation for Bank 1
            P1456 - 35-10 - Limit Reached - Intermittent
17521 - Oxygen (Lambda) Sensor; B1 S1
            P1113 - 35-10 - Internal Resistance too High - Intermittent
17539 - Oxygen (Lambda) Sensor; B2 S1
            P1131 - 35-10 - Internal Resistance too High - Intermittent
Readiness: 0000 1000

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 01V-927-156.lbl
   Part No: 4B0 927 156 DJ
   Component: AG5 01V 2.7l5VT USA 1717 
   Coding: 00002
   Shop #: WSC 00000 
   VCID: 72BED02D7DBA28CB897-513C

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8E0-614-111-EDS.lbl
   Part No: 8E0 614 111 A
   Component: ABS/EDS 5.3 QUATTRO D10 
   Shop #: BB 24334 
   VCID: 1C62DE95CFBECEBB73B-51CE

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 4B0-820-043-MY1.lbl
   Part No: 4B0 820 043 L
   Component: A6-Klimavollautomat D64 
   Coding: 00160
   Shop #: WSC 02325 
   VCID: 2310E569F2C0F143B21-2596

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4B0-959-655-AI8.lbl
   Part No: 4B0 959 655 F
   Component: Airbag Front+Kopf  1002 
   Coding: 00406
   Shop #: WSC 02325 
   VCID: 33301529422061C3421-5118

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 4B0-907-487.lbl
   Part No: 4B0 907 487
   Component: E Lenkrad Elektronik D03 
   VCID: 698CB741506CEB1338D-4BBA

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
   Part No: 4B0 920 980 M
   Component: C5-KOMBIINSTR. VDO D11  
   Coding: 02264
   Shop #: WSC 00000 
   VCID: 2F381959AE084523269-513C

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 4B0-962-258.clb
   Part No: 4B0 962 258 J
   Component: Central Lock/Alarm  D33 
   Coding: 15885
   Shop #: WSC 02325 
   VCID: 303A1A25B3365ADB3F3-4EC8

1 Fault Found:
01561 - Rear left door
            59-00 - Can't Unlock

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: None
   Part No: 4B0 959 760 A
   Component: Sitzmemory          D05 
   VCID: 2B000D499A1039030A1-4AE0

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation        Labels: 4B0-919-887-BNS3.lbl
   Part No: 4B0 919 887 B
   Component: Navigation     BNO 0001 
   VCID: 323E102DBD3A68CB497-4AE0

1 Fault Found:
65535 - Internal Control Module Memory Error
            00-00 - -

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 4B0-951-178.lbl
   Part No: 4B0 951 178 A
   Component: Innenraumueberw.    D04 
   Coding: 00101
   Shop #: WSC 02325 
   VCID: 2616FC7D81F2046BD5F-5184

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8D0-035-1xx-56.lbl
   Part No: 4B0 035 195 A
   Component:  Radio              D00 
   Coding: 00205
   Shop #: WSC 02325 
   VCID: 1E66D49DD9A2DCAB9DF-4AE0

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 4B0-919-283.lbl
   Part No: 8D0 919 283
   Component: Parkingsystem A6 USA D05 
   Coding: 01126
   Shop #: WSC 02325 
   VCID: 6C82CE555F9EFE3B43B-51F2

No fault code found.

End----------(Elapsed Time: 04:29, VBatt start/end: 12.3V/12.3V)-----------
 
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   #2  

Uwe

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I'm preparing this car for my son in Florida so hopefully it won't happen again!
Check the grounds for the airbag module. Poor grounding is something that's been known to cause this fault.
Occupied Seat Sensor Pass. Side "Too High"
Belt Inquiry Front Driver Side "Too High"
Belt Inquiry Front Pass. Side "Too High"
I'm really skeptical that a 4B A6 would have a passenger seat occupancy sensor.
Do Belt Inquiry measuring values not change when the belts are buckled and unbuckled? If so, you might want to disconnect the airbag module again and check those circuits with a meter.

Given all those engine sensor faults, I would start by checking a wiring diagram to see if perhaps the EGT sensor 1 and the Lambda sensors have anything in common.

-Uwe-
 
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