Wabco 4s/4m ABS problem.

Kiaora.
I have an issue with a wabco ABS self test.
On ign on the unit will not self test. No 3sec flash. It’s not the bulb.
After checking it over I found there’s no power
to the ECU test switch on the unit.

Another head scratch. There is 12.5 Volts at the wheel spin signal pin. 18 pin plug. Pin 16.
I can’t find any info on what pin should have what voltage.
Any Wabco experts out there.

 

Thanks. Yep. Not legal.
There’s 12.5 volts on both pin inputs in ECU so I think it’s alive.
I gotta figure out what powers the ECU test switch. The wires to that that are dead.

Thanks for commenting

 

Roger that. Will do. Soon