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Test 88B - All Doors Fail To Lock & Unlock From Any Switch

NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER  section in this article. Perform TEST VER-1  VERIFICATION TEST after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Using scan tool, read door lock switch voltage. If voltage is more than 0.2 volt, go to TEST 88C  . If voltage is 0.2 volt or less, remove door lock relay and door unlock relay from junction block. See Figure . Junction block is located behind end cover, on left side of instrument panel. Go to next step.
  2. Using scan tool in voltmeter mode, check voltage on door lock relay connector terminal "B" (Red wire). If voltage is 10 volts or less, repair open Red wire. If voltage is more than 10 volts, go to next step.
  3. Using scan tool in ohmmeter mode, check resistance of door lock relay connector and door unlock relay connector terminals "D" (Black wire) and "E" (Black wire). If resistance is 5 ohms or greater at any terminal, repair open Black wire. If resistance is less than 5 ohms, go to next step.
  4. Using an external ohmmeter, check resistance between door lock relay terminals "A" (Orange/Black wire) and terminal "D" (Black wire), and between door unlock relay terminals "A" (Pink/Black wire) and terminal "D" (Black wire). If resistance is more than 5 ohms, replace relay. If resistance is less than 5 ohms, go to next step.
  5. Using an external ohmmeter, check resistance between door lock relay terminals "C" (Orange/White wire) and terminal "E" (Black wire), and between door unlock relay terminals "C" (Pink/Violet wire) and terminal "E" (Black wire). If resistance is not 65-85 ohms, replace relay. If resistance is 65-85 ohms, go to next step.
  6. Disconnect Remote Keyless Entry (RKE) module. See Figure . Using scan tool in ohmmeter mode, check resistance of door lock relay connector terminal "A" (Orange/Black wire). If resistance is less than 5 ohms, repair short to ground in Orange/Black wire. If resistance is 5 ohms or greater, go to next step.
  7. Check resistance of door unlock relay connector terminal "A" (Pink/Black wire). If resistance is less than 5 ohms, repair short to ground in Pink/Black wire. If resistance is 5 ohms or greater, go to next step.
  8. Reinstall door unlock relay. Check resistance of door lock relay connector terminal "A" (Orange/Black wire). If resistance is 5 ohms or greater, repair open Orange/Black wire. If resistance is less than 5 ohms, go to next step.
  9. Gain access to Body Control Module (BCM). BCM is located behind right kick panel. Leave BCM connectors connected. Using test light, backprobe BCM Gray connector terminal No. 18 (Orange/White wire). Using scan tool, actuate door lock relay. If test light flashes, repair open Orange/White wire. If test light does not flash, go to next step.
  10. Stop relay actuation. Turn ignition off. Disconnect and inspect BCM Gray connector. Repair connector as necessary. If connector is okay, replace BCM.
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