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Test 72A - Doors Fail To Lock From Any Switch

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  in this article. For appropriate wiring diagram, see WIRING DIAGRAMS  section at the end of this article. Perform TEST VER-1B  after each repair.
CAUTION: Always turn ignition off prior to disconnecting or connecting any module connector.
  1. Using scan tool, actuate door locks. If doors do not lock, go to step 4). If doors lock, turn ignition off and remove key. Go to next step.
    NOTE: Ensure left front door remains open in following step.
  2. Using scan tool, read key-in ignition status. If scan tool does not display KEY IN IGN OPEN, go to TEST 72B . If scan tool displays KEY IN IGN OPEN, go to next step.
  3. Disconnect Body Control Module (BCM) Blue connector. BCM is located behind left side knee panel. Using scan tool in voltmeter mode, check voltage on BCM Blue connector terminal No. 4 (Orange/Violet wire). Observe scan tool voltage while pressing each power door lock switch to LOCK position. If voltage is more than 10 volts when each switch is pressed, replace BCM. If voltage is less than 10 volts when each switch is pressed, repair open Orange/Violet wire.
  4. Stop door lock actuation. Gain access to Body Control Module (BCM). BCM is located behind left side knee panel. Using scan tool in voltmeter mode, backprobe BCM Blue connector terminal No. 21 (Orange/White wire). If voltage does not pulsate between zero and more than 10 volts, replace BCM. If voltage pulsates between zero and more than 10 volts, go to next step.
  5. Stop door lock actuation. Remove door lock relay (fourth relay from right, bottom row) from micro relay center, located behind center console. Check voltage on door lock relay connector (Orange/White wire). Using scan tool, actuate door locks while observing scan tool voltage. If voltage does not pulsate between zero and more than 10 volts, repair open Orange/White wire. If voltage pulsates between zero and more than 10 volts, go to next step.
  6. Stop door lock actuation. Using scan tool in voltmeter mode, check voltage on door lock relay connector (Red wire). If voltage is less than 10 volts, repair open Red wire. If voltage is more than 10 volts, go to next step.
  7. Using scan tool in ohmmeter mode, check resistance of door lock relay connector terminal "E" (Black wire). If resistance is more than 5 ohms, repair open Black wire. If resistance is less than 5 ohms, go to next step.
    NOTE: Ensure door unlock relay is installed in following step. Door unlock relay is third relay from right, bottom row in micro relay center (located behind center console).
  8. Check resistance of door lock relay connector (Orange/Black wire). If resistance is less than 5 ohms, replace door lock relay. If resistance is more than 5 ohms, go to next step.
  9. Remove door unlock relay. Using scan tool in ohmmeter mode, check resistance of at door unlock relay connector terminal "D" (Black wire). If resistance is more than 5 ohms, repair open Black wire. If resistance is less than 5 ohms, replace door unlock relay.
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