Mirrors - Power: Other GMC C3500 HD

Left or Right Power Mirror Inoperative

Check power mirror switch, power mirror, motor(s), wiring and ground.

Memory Function Does Not Return To Memorized Position

Ensure memorized position set in driving position switch. Check driving position switch. Check tilt and telescoping ECU. Check mirror ECU. Check mirror sensors. Check wiring and ground.

BOTH POWER MIRRORS DO NOT OPERATE

1. Disconnect outside power mirror switch. Connect test light between Orange wire and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open circuit in Orange wire.
2. Connect test light between Orange and Black wires. If test light illuminates, repair open circuit in Red wire. If Red wire is okay, replace power mirror switch. If test light does not illuminate, repair open circuit in Black wire.

LEFT POWER MIRROR DOES NOT MOVE LEFT AND RIGHT

1. Disconnect left power mirror. Press switch in LEFT position. Connect test light between Red wire and ground. If test light illuminates, go to next step. If test light does not illuminate, check for open circuit in Red wire. If Red wire is okay, replace mirror switch.
2. Press switch in RIGHT position. Connect test light between Light Blue wire and ground. If test light illuminates, replace left power mirror. If test light does not illuminate, repair open circuit in Light Blue wire. If Light Blue wire is okay, replace mirror switch.

LEFT POWER MIRROR DOES NOT MOVE UP AND DOWN

1. Disconnect left power mirror. Press switch in UP position. Connect test light between Red wire and ground. If test light illuminates, go to next step. If test light does not illuminate, check for open circuit in Red wire. If Red wire is okay, replace mirror switch.
2. Press switch in DOWN position. Connect test light between Light Blue wire and ground. If test light illuminates, replace left power mirror. If test light does not illuminate, repair open circuit in Light Blue wire. If Light Blue wire is okay, replace mirror switch.

RIGHT POWER MIRROR DOES NOT MOVE LEFT AND RIGHT

1. Disconnect right power mirror. Press switch in RIGHT position. Connect test light between Red wire and ground. If test light illuminates, go to next step. If test light does not illuminate, check for open circuit in Red wire. If Red wire is okay, replace mirror switch.
2. Press switch in LEFT position. Connect test light between Gray wire and ground. If test light illuminates, replace right power mirror. If test light does not illuminate, repair open circuit in Gray wire. If Gray wire is okay, replace mirror switch.

RIGHT POWER MIRROR DOES NOT MOVE UP AND DOWN

1. Disconnect right power mirror. Press switch in UP position. Connect test light between Red wire and ground. If test light illuminates, go to next step. If test light does not illuminate, check for open circuit in Red wire. If Red wire is okay, replace mirror switch.
2. Press switch in DOWN position. Connect test light between Purple/White wire and ground. If test light illuminates, replace right power mirror. If test light does not illuminate, repair open circuit in Purple/White wire. If Purple/White wire is okay, replace mirror switch.