BMW X3 ABS/ESC LIGHT

I'd tell him I wasn't prepared to work on it, Go down the bodging route and it's a recipe for disaster.
Just remember you have no friends in the motor trade only people you know 

The ABS malfunction. lamp must illuminate and then go out,so as long as not indicating a fault it's a pass
The ESP lamp must also illuminate and then go out ,so as long is not indicating a fault it's a pass.
You won't be able to do anything regards the wiring ,but may be beneficial to cover yourself and make an advisory of the abs and ESP going out same time as charge light which may be unusual .
As a testing station that promotes road safety ,WE would not carry out any work to hide a potential problem and knowingly put a vehicle back on the road that's not roadworthy ,as that's what the guy is asking yous to do and undermines the testing scheme .

I have always been told that if Abs lamps and/or stability control warning lamps indicate faults that the system is disabled,
eg - ABS will not work and Stability control will not work if warning lights are on.

Who would be liable if this vehicle had a crash and killed somebody after wiring the lamps up so they go out with the charge light when the engine is started ?

I would tell him to go elswhere but not as politely.


Wally

Sorry just to be clear ,we haven't been asked to do the Bodge, if it happens he or one of his associates will ,I certainly wouldn't get involved in that sort of thing . I just wanted opinions on the best course of action if it comes back for retesta s described in my op..

There's an even simpler way to fix this fault. Remove the electronic motor on the transfer box, take the cover off and spin the plastic cog round 180 so that the unused and practically brand new gear teeth are now doing the work.

Providing that the control system is not software related and the motor spindle is exactly positioned correctly when the gear wheel is refitted 

I wasn't having a dig Gaz just thinking back to the Montego stepper motors operation, they have a gear wheel fitted but was timed in position using software, it was possible to adjust them but the ECM did not control them correctly afterwards. OK maybe Montego's are before your time, but don't read into it too much I didn't mean anything by it.