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Test 19D - Diagnosing Door Lock Circuit

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article in this section.
CAUTION: Always turn ignition off prior to disconnecting or connecting any module connector.
  1. Using DRB, 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 DRB, read key-in ignition status. If DRB does not display KEY IN IGN:OPEN, go to TEST 39B  . If DRB displays KEY IN IGN:OPEN, go to next step.
  3. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Using DRB in voltmeter mode, check voltage on switched battery feed circuit (Orange/Violet wire) at Blue BCM connector terminal No. 8. Observe DRB voltage while depressing each power door lock switch to LOCK position. If voltage is more than 10 volts when each switch is depressed, replace BCM. Perform TEST VER-1B  . If voltage is less than 10 volts when each switch is depressed, repair open Orange/White wire. Perform TEST VER-1B  .
  4. Stop door lock actuation. Gain access to Body Control Module (BCM). BCM is located behind center console. Using DRB in voltmeter mode, backprobe door lock relay control circuit (Orange/White wire) at Blue BCM connector terminal No. 17. If voltage does not pulsate between zero and more than 10 volts, replace BCM. Perform TEST VER-1B  . 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 control circuit (Orange/White wire) at door lock relay connector. Using DRB, actuate door locks while observing DRB voltage. If voltage does not pulsate between zero and more than 10 volts, repair open Orange/White wire. Perform TEST VER-1B  . If voltage pulsates between zero and more than 10 volts, go to next step.
  6. Stop door lock actuation. Using DRB in voltmeter mode, check voltage on fused battery feed circuit (Red wire) at door lock relay connector. If voltage is less than 10 volts, repair open Red wire. Perform TEST VER-1B  . If voltage is more than 10 volts, go to next step.
  7. Using DRB in ohmmeter mode, check resistance of lock relay ground circuit (Black wire) at door lock relay connector terminal "E". If resistance is more than 5 ohms, repair open Black wire. Perform TEST VER-1B  . If resistance is less than 5 ohms, go to next step.
    NOTE: Ensure door unlock relay is installed in following step.
  8. Check resistance of door lock relay output circuit (Orange/Black wire) at door lock relay connector (Orange/Black wire). If resistance is less than 5 ohms, replace door lock relay. Perform TEST VER-1B  . If resistance is more than 5 ohms, go to next step.
  9. Remove door unlock relay (third relay from right, bottom row) from micro relay center, located behind center console. Using DRB in ohmmeter mode, check resistance of system ground circuit (Black wire) at door unlock relay connector terminal "D". If resistance is more than 5 ohms, repair open Black wire. Perform TEST VER-1B  . If resistance is less than 5 ohms, replace door unlock relay. Perform TEST VER-1B  .
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