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Home >> GMC >> 1996 >> Forward Control 6.5 Y, Automatic >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Power Door Lock System >> Testing >> Left Front Door Does Not Lock/Unlock Electrically
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Left Front Door Does Not Lock/Unlock Electrically

  1. Disconnect left front door lock actuator motor connector. Connect test light between motor connector terminal "A" (Tan wire) and ground. Lock all doors at any power door lock switch. If test light comes on, go to next step. If test light does not come on, repair open circuit in Tan wire.
  2. Connect test light between left front door lock actuator motor connector terminal "B" (Gray wire) and ground. Unlock all doors at any power door lock switch. If test light comes on, replace left front door lock actuator motor. If test light does not come on, repair open circuit in Gray wire.