SRS & Multifunction Faults

[pete12345]

Firstly, I should say I'm using a China Delphi CDP Autocom to read & clear faults. I believe the car is W203, but when I read out the VIN Delphi selects a 2008 CLC which it's definitely not.

SRS fault seems to be the drivers airbag has high-resistance. Will look at the connector when it stops raining !!

Multifunction diags give a whole bunch of faults, but as far as we can tell everything on the car works fine. It's also reporting parking aid faults, but the car doesn't have parking sensors !!

Here's just the SAM list. Car was running at the time, so not sure why I'm getting over & under voltage at same time !! Similar fault list from "Front SAM" ??

Multifunction (SAM - Rear (Signal Acquisition and Control Module - Rear) -
SAMH203 (Signal Acquisition and Control Module - Rear) - MT/AT)
B1043 - Terminal 30: undervoltage< 8 V - Permanent

B1093 - Fault in CAN communication with control unit Left front door. If fault code occurs with no complaint reported and no malfunctions, erase fault memory and
perform a function check - Permanent

B1045 - Overvoltage - Permanent

B1078 - Fault in communication with alarm signal siren with additional battery or there is a cable fault - Permanent

B1044 - Terminal 30: undervoltage< 10,5 V - Permanent

B1066 - Left turn signal; short circuit or Open circuit. - Permanent

B1089 - Fault in CAN communication with control unit Instrument cluster. If fault code occurs with no complaint reported and no malfunctions, erase fault memory and perform a function check - Permanent

B1054 - Left stop light; short circuit or open circuit - Permanent

B1091 - Fault in CAN communication with control unit AAC pushbutton. If fault code occurs with no complaint reported and no malfunctions, erase fault memory and perform a function check. - Permanent

 

[BlackC55]

The over and under voltage faults are probably historic. Most are what we call BS codes. To be sure measure the output of the alternator when running.

If you have no faults, no symptoms then ignore the codes.

You will probably have to do some wiring checks for the air bag fault. You will need wiring diagrams and possibly a device that makes a resistance like this: https://cpc.farnell.com/c/test-equi...ulti-meter or resistance and continuity meter.

Are there any faults with the steering wheel buttons? Any codes in the SWCM?

 

[pete12345]

Yes, I have several Multimeters (and 40+ years of electonic experience !! ), so should be able to figure the SRS fault.

The thing I find wierd are the faults from non-existent ECU's. Mybe it's just a quirk with the China Delphi CDP clone ?

The oddity with the VIN is strange. The "read VIN" function matches the car and V5C document, but CDP identifies the VIN as a w203 CLC 2008 onwards !!

 

[Ted]

The oddity with the VIN is strange. The "read VIN" function matches the car and V5C document, but CDP identifies the VIN as a w203 CLC 2008 onwards !!

Which would cause me to question the quality/reliability of the Chinese clone.

 

[pete12345]

I tend to agree. It's pretty good with most cars, but I do suspect the offline VIN decode is questionable. US decoders generally get UK or European decodes wrong and bitch about wrong check digits !! This one gets it correct. https://www.vindecoderz.com/

BTW, the SRS fault has disapperaed this evening . Prob temperature & damp related, so definitely gonna clean the connector(s).