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Home >> GMC >> 1996 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Keyless Entry System - Remote >> Testing >> Keyless Entry Does Not Operate

Keyless Entry Does Not Operate

  1. If right door lock operates from either power door lock switch, go to next step. If right door lock does not operate from either power door lock switch, see appropriate DOOR LOCKS - POWER article.
  2. If rear window operates from vehicle's rear window release switch, go to next step. If rear window does not operate from vehicles rear window release switch, problem is not remote keyless entry related.
  3. If left power door lock operates from either of vehicle's power door lock switches, go to step 8). If left power door lock does not operate from either of vehicle's power door lock switches, go to next step.
  4. Connect jumper wire between keyless entry module connector C1, terminal "D" (Tan wire) and ground. If either power door lock does not lock from either power door lock switch, go to step 6). If left power door lock now locks from either power door lock switch, go to next step.
  5. Connect ohmmeter between Black wire at keyless entry module connector C1 and ground. If continuity is present, replace keyless entry module. Reprogram replacement module. See PROGRAMMING  . If continuity is not present, repair open circuit in Black wire.
  6. Measure voltage between left front door lock motor terminal "A" (Gray wire) and ground. Hold either power door lock switch in LOCK position. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in Gray wire.
  7. Measure voltage between left front door lock motor connector terminals "B" (Tan wire) and "A" (Gray wire). Hold power door lock switch in LOCK position. If battery voltage is present, replace left door lock motor. If battery voltage is not present, repair open circuit in Tan wire.
  8. If luggage compartment release function operates, go to next step. If luggage compartment release function does not operate, go to ONLY REAR WINDOW CARGO DOOR RELEASE FUNCTION DOES NOT OPERATE.
  9. If any transmitter functions operate, go to next step. If any transmitter functions do not operate, go to TRANSMITTER FUNCTIONS DO NOT OPERATE  .
  10. Connect a jumper wire between program connector. Using a known-good transmitter, operate transmitter by pressing a single button once. Disconnect jumper wire from program connector. If known-good transmitter operates all remote keyless entry functions, go to step 12). If transmitter does not operate all remote keyless entry functions, repair open circuit in White wire and reprogram keyless entry module.
  11. Measure voltage between keyless entry module connector C2, terminal "E" (White wire) and ground while pressing either power door lock switch in UNLOCK position. If battery voltage is present, go to step 12) If battery voltage is not present, repair open circuit in White wire and reprogram keyless entry module. See PROGRAMMING  .
  12. Measure voltage between keyless entry module connector C2, terminal "D" (Light Blue wire) and ground while pressing either power door lock switch in LOCK position. If battery voltage is present, replace keyless entry module. If battery voltage is not present, repair open circuit in Light Blue wire. Reprogram keyless entry module. See PROGRAMMING  .
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