The owner reports the abs and brake warning lights flashing on together intermittantly while driving. No faults are stored and now the abs light does not come on at all, even when the ignition is turned off an back on. No codes listed. All feeds/earths to abs module ok.
We thought we had found the fault when we wiggled a grey wire on the abs module plug and the abs light flashed but now it doesn't do anything. A/D doesn't have any mention of this wire or the two wires next to it unless the vehicle has ESP/TCS, which it hasn't. There is no voltage on these wires.
I do have 10.5v on the wire for the ABS light which then occasionally drops to 0.2v. I'm assuming the ABS module earths the light to illuminate it but with the abs module disconnected and an earth supplied the abs light still does not come on.
I suspect a fault with the instrument cluster and I can't get comms with it.
The dealers have previously had the vehicle for 4 days and have told the customer it is a wiring fault and they will need it for at least a week.