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Home >> GMC >> 1996 >> Forward Control 7.4 J >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Power Door Lock System >> Testing >> All Power Door Lock Motors Do Not Lock

All Power Door Lock Motors Do Not Lock

  1. Remove power door lock relay. Connect test light between relay terminal "F" (Light Blue wire) and ground. Lock all doors at any power door lock switch.
  2. If test light comes on, replace power door lock relay. If test light does not come on, repair open circuit in Light Blue wire.


  1. Remove power door lock relay. Connect test light between relay terminal "F" (Light Blue wire) and ground. Lock all doors at any power door lock switch.
  2. If test light comes on, replace power door lock relay. If test light does not come on, repair open circuit in Light Blue wire.