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Test 19E - Diagnosing Door Lock & Unlock Circuit

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Perform TEST VER - 1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Using DRB-II, actuate auto door locks. If doors lock, go to step 4). If doors do not lock, turn ignition off. Remove and inspect fuse No. 3. If fuse is blown, go to TEST 28B. If fuse is okay, use DRB-II in voltmeter mode to measure voltage of battery feed circuit (Black/Red wire) to fuse No. 3 in fuse panel.
  2. If voltage is less than 10 volts, repair Black/Red wire as necessary. If voltage is more than 10 volts, reinstall fuse No. 3. Remove driver's door panel to gain access to left door lock switch.
  3. Measure voltage of fused battery feed circuit at left door lock switch (Pink wire). If voltage is less than 10 volts, repair open Pink wire. If voltage is more than 10 volts, replace left door lock switch.
  4. Turn ignition off. Remove and inspect fuse No. 24. If fuse is blown, go to step 8). If fuse is okay, use DRB-II in voltmeter mode to measure voltage of battery feed circuit (Red/White wire) to fuse No. 24 in fuse panel.
  5. If voltage is less than 10 volts, repair Red/White wire as necessary. If voltage is more than 10 volts, reinstall fuse No. 24. Measure voltage of fused battery feed circuit at door lock relay connector terminal No. 10 (Red wire).
  6. If voltage is less than 10 volts, repair open Red wire. If voltage is more than 10 volts, disconnect lock and unlock relays. Using an external ohmmeter, measure resistance of switched door lock/unlock motor feed circuit between door lock relay connector terminal No. 6 (Orange/Black wire) and terminal No. 11 (Pink/Black wire).
  7. If resistance is more than 5 ohms, repair open in switched door lock/unlock motor feed circuit. If resistance is less than 5 ohms, replace lock and unlock relays.
  8. Using DRB-II in ohmmeter mode, measure resistance of battery feed circuit (Red/White wire) to fuse No. 24 in fuse block. If resistance is less than 5 ohms, repair short to ground in Red/White wire. If resistance is more than 5 ohms, disconnect lock and unlock relays.
  9. Measure resistance of switched door lock motor feed circuit. If resistance is less than 5 ohms, repair short to ground in switched door lock/unlock motor feed circuit. If resistance is more than 5 ohms, replace fuse No. 24.
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