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All Doors Fail To Lock/Unlock From Any Switch

NOTE: Perform POWER DOOR LOCK TEST 2A  before proceeding with this test. For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST: VER-2A  after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Using scan tool, read door lock switch voltage. If scan tool displays voltage greater than .2 volts, go to POWER DOOR LOCK TEST 2C . If scan tool displays voltage of .2 volts or less, go to next step.
  2. Remove door unlock and lock relays from junction block. See Figure. Junction block is located behind left end cap of instrument panel. See Figure. Using external voltmeter, measure voltage between ground and terminal "D" (fused B+) on door lock relay socket. If voltage is 10 volts or less, repair open fused B+ circuit between Power Distribution Center (PDC) and lock relay. If voltage is more than 10 volts, go to next step.
  3. Measure voltage between ground and terminal "C" (fused B+) on door lock relay socket. If voltage is 10 volts or less, repair open fused B+ circuit between PDC and lock relay. If voltage is more than 10 volts, go to next step.
  4. Turn ignition off and ensure all lights are off. Using external ohmmeter, measure resistance between ground and terminal "E" (ground) on lock relay socket. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or greater, repair open ground circuit.
  5. Turn ignition off and ensure all lights are off. Using external ohmmeter, measure resistance between ground and terminal "E" (ground) on unlock relay socket. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or greater, repair open ground circuit.
  6. Using external ohmmeter, measure resistance between terminals "B" and "E" on lock relay. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, replace relay.
  7. Using external ohmmeter, measure resistance between terminals "B" and "E" on unlock relay. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, replace relay.
  8. Using external ohmmeter, measure resistance between terminals "A" and "C" on unlock relay. If resistance is 65-90 ohms, go to next step. If resistance is not 65-90 ohms, replace relay.
  9. Using external ohmmeter, measure resistance between ground terminal "B" (lock relay output circuit) on lock relay socket. If resistance is less than 20 ohms, repair lock relay output circuit for short to ground. If resistance is 20 ohms or greater, go to next step.
  10. Measure resistance between ground terminal "B" (unlock relay output circuit) on unlock relay socket. If resistance is less than 20 ohms, repair unlock relay output circuit for short to ground. If resistance is 20 ohms or greater, go to next step.
  11. Install unlock relay in junction block. Measure resistance between ground terminal "B" (lock relay output circuit) on lock relay socket. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or greater, repair open lock or unlock relay output circuit.
  12. Connect test light between terminals "A" and "C" on lock relay socket. Using scan tool, actuate door lock relay. If test light flashes during actuation, replace relay. If test light does not flash during actuation, go to next step.
  13. Stop actuation. Remove Body Control Module (BCM). BCM is mounted to junction block. Inspect junction block 20-pin internal connector. Repair as needed. If connector is okay, replace BCM.
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