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Test 19B - Diagnosing Door Lock & Unlock 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. Lower both front door windows. Using DRB, actuate door locks. If doors do not lock, go to step 5). If doors lock, go to next step.
  2. Turn ignition off. Remove and inspect IOD fuse from Power Distribution Center (PDC). If fuse is blown, go to TEST 28C  . If fuse is okay, go to next step.
  3. Using DRB in voltmeter mode, check voltage on battery feed circuit (Black/Red wire) to IOD fuse in PDC. If voltage is less than 10 volts, repair Black/Red wire as necessary. Perform TEST VER-1B  . If voltage is more than 10 volts, go to next step.
  4. Reinstall IOD fuse. Remove driver's door panel to gain access to left door lock switch. Using DRB in voltmeter mode, backprobe fused battery feed circuit (Pink wire) at left door lock switch. If voltage is less than 10 volts, repair open Pink wire. Perform TEST VER-1B  . If voltage is more than 10 volts, replace left door lock switch. Perform TEST VER-1B  .
  5. Turn ignition off. Remove and inspect fuse No. 10 from fuse panel. If fuse is blown, go to step 8). If fuse is okay, go to next step.
  6. Using DRB in ohmmeter mode, check resistance of battery feed circuit (Red/White wire) to fuse No. 10 connector. If resistance is less than 5 ohms, repair short to ground in Red/White wire. Perform TEST VER-1B  . If resistance is more than 5 ohms, go to next step.
  7. Remove door lock and door unlock relays from micro relay center, located behind center console. Door lock relay is fourth relay from right, bottom row. Door unlock relay is third relay from right, bottom row. Disconnect remote keyless entry module connector (if equipped). Using DRB in ohmmeter mode, check resistance of lock relay output circuit (Orange/Black wire) at lock relay connector. If resistance is less than 5 ohms, repair short to ground in Orange/Black wire. Perform TEST VER-1B  . If resistance is more than 5 ohms, replace fuse No. 10. Perform TEST VER-1B  .
  8. Using DRB in voltmeter mode, check voltage on battery feed circuit (Red/White wire) to fuse No. 10 in fuse panel. If voltage is less than 10 volts, repair Red/White wire as necessary. Perform TEST VER-1B  . If voltage is more than 10 volts, go to next step.
  9. Reinstall fuse No. 10. Remove door lock and door unlock relays from micro relay center located behind center, console. Door lock relay is fourth relay from right, bottom row. Door unlock relay is third relay from right, bottom row. Using DRB in voltmeter mode, check voltage on battery feed circuit (Red/White wire) to fuse No. 10 in fuse panel. If voltage is less than 10 volts, repair open Red/White wire. Perform TEST VER-1B  . If voltage is more than 10 volts, go to next step.
  10. Using an external ohmmeter, check resistance between door lock relay connector terminal "A" (Orange/Black wire) and door unlock relay connector terminal "A" (Pink/Black wire). If resistance is more than 5 ohms, repair Orange/Black wire or Pink/Black wire as necessary. Perform TEST VER-1B  . If resistance is less than 5 ohms, go to next step.
  11. Using DRB in ohmmeter mode, check resistance of all ground circuits (Black wires) at door lock relay connector and door unlock relay connector. If resistance is more than 5 ohms on any circuit, repair appropriate open circuit. Perform TEST VER-1B  . If resistance is less than 5 ohms on all circuits, replace door lock and door unlock relays. Perform TEST VER-1B  .
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