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Power Door Lock Test 2A - All Doors Fail To Lock & Unlock From Any Switch

NOTE: Perform POWER DOOR LOCK TEST 1A before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION  . For wiring diagrams, refer to WIRING DIAGRAMS  . Perform, after each repair, TEST VER-1A - VERIFICATION PROCEDURE  .
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Ensure windows are down, key is removed from ignition and doors are unlocked. Using scan tool, actuate door locks. If door locks operate, go to next step. If door locks did not operate, go to POWER DOOR LOCK TEST 2B  .
  2. Using scan tool, read door lock switch voltage. If voltage is 0.5 volt or less, go to next step. If voltage is more than 0.5 volt, repair short to battery voltage in circuit between left or right door lock switch and Body Control Module (BCM).
  3. Hold left door lock switch in lock position. Using scan tool, read door lock switch voltage. If voltage is more than 10 volts, replace BCM. If voltage is 10 volts or less, go to next step.
  4. Disconnect left front door lock switch White 4-pin connector and ensure connector is clean and not damaged. Using external voltmeter, measure voltage on switch connector terminal No. 1 (Pink wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Pink wire.
  5. Disconnect BCM 20-pin connector located at junction block and ensure connector is clean and not damaged. See Figure and Figure in CHIME TESTS 2A and 3A. Using an external ohmmeter, measure resistance between terminal No. 8 (White/Dark Green wire) on BCM 20-pin connector and terminal No. 4 (White/Dark Green wire) on left door lock switch White 4-pin connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in White/Dark Green wire.
  6. Reconnect left front door lock switch White 4-pin connector. Using external voltmeter, measure voltage between ground and terminal No. 8 (White/Dark Green wire) on BCM 20-pin connector. Depress left front door lock switch to LOCK position and measure voltage. If voltage is 10 volts or less, replace both door lock switches. If voltage is more than 10 volts, replace BCM.
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