BCM not communicating

[StephenM]

I have brought this up before. BCM will not communicate through the OBD port. I checked current and continuity so the wiring from port to BCM seems OK. 12v from power (16) and 5.5v from the BCM. Good earth continuity. However there is only one earth on the port. Every thing I have seen says two. My research suggest a faulty BCM (Snap on Tools documentation). If I get a new BCM does the kay have to be programmed to it or does the key programme to the PCM? The car is running a bit rich and occassional stalls at low revs. I have earthed BCM as suggested inother threads re running rich. Many thanks, Steve

 

[woteva]

What are you connecting to the port ?
You will need an ALDL interface as the VR/VS do not use OBD 1 or 2 protocol.

 

[BlackVXGTS]

Have you diagnosed using the tried and true "paper clip" method? Also check out the attached pdf files.

Checking error codes VR/VS (Revised)

Checking your Computer for Faults (VR - VS) Locate the diagnostic connector under the the steering column on the drivers side. Grab a paper clip and bridge pins number 5 & 6 'black' and 'white with black stripes' respectively on the ALDL (Assembly Line Diagnostic Link) connected which are...

forums.justcommodores.com.au

 

[StephenM]

What are you connecting to the port ?
You will need an ALDL interface as the VR/VS do not use OBD 1 or 2 protocol.

A mechanic tried with his machine. The Holden dealer also could not communicate.

 

[StephenM]

Have you diagnosed using the tried and true "paper clip" method? Also check out the attached pdf files.

http://[URL]https://forums.justcommodores.com.au/threads/checking-error-codes-vr-vs-revised.22307/

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Paper clip says 12. However since the BCM will not communicate, and it is running rich, it seems unlikely nothing is wrong.