Nige
Senior Member
In the case of the problem persisting, take a look at the wiring between the park brake switch and the ECM.
There are two wires, E734 & E735, between the switch and the ECM. The ECM has to see continuity to ground on E735 and open circuit on E734 with the park brake switch in the ON position, and continuity on E734/open circuit on E735 when it is in the OFF position.
The common is ground wire C214. See below.
There are two wires, E734 & E735, between the switch and the ECM. The ECM has to see continuity to ground on E735 and open circuit on E734 with the park brake switch in the ON position, and continuity on E734/open circuit on E735 when it is in the OFF position.
The common is ground wire C214. See below.