Commodore warning light problem

Today I would like to talk about a common fault on Commodores from VT to VY series.

The typical symptom is the dashboard warning lights all coming on and if you present your car to a workshop and they try to hook up their scanner they find that they can not communicate with anything on the car.

The fault is actually caused by the ABS control unit and we sell them by the bucketload! You can confirm the fault by disconnecting the multi pin plug on the ABS unit and if all the dash lights go out (with the exception of the ABS and TRAC OFF light, if fitted) and you now have communication with all modules (except ABS of course) then you have found the problem. It is caused by an internal fault where the serial data line is corrupted, hence the symptoms.

Just a short one this time, but hopefully it could save you a lot of time down the track.

The Doctor.

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