I'm currently troubleshooting a power door lock issue on my ‘98 Yukon (4dr). The driver side door and rear cargo door will not lock/unlock. I’ve tested both actuators; they are good. I’ve checked continuity of the door harness; it is good (no broken wires). Power for both the door (and I’m guessing the rear door harness) comes down through the cowl around the hood release handle. I have 12v on the grey wire, nothing on the tan wire coming back from the relay. Same issue in the back, at the rear doors. Does anyone know where these wires tie together, before I start ripping out the dash? According to the schematic, all of the tan wires (for every door actuator) are paralleled together, and all of the grey wires (for every door actuator) are paralleled together after the relay. I believe the wires for the rear cargo doors may run down the driver side sill (found a harness under that kick panel at the hood release, wires tested the same). All of the other three passenger door power locks work fine. Thanks in advance.