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All Doors Failing To Lock & Unlock One Any Switch

  1. If vehicle is equipped with Vehicle Theft Security System (VTSS), go to next step. If vehicle is not equipped with VTSS, go to step  9 .
  2. Lock and unlock vehicle using key in driver's and passenger's door lock cylinders. If vehicle does not lock and unlock properly from door lock cylinders, go to next step. If vehicle locks and unlocks properly from door lock cylinders, go to step  9 .
  3. Turn ignition off. Disconnect inoperative door lock cylinder switch harness connector. Measure voltage at terminal No. 2 (Pink wire) at door lock cylinder switch harness connector. If battery voltage exists, go to next step. If battery voltage does not exist, repair power distribution circuit as necessary. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  4. Disconnect Body Control Module (BCM) harness connector C4. Measure resistance between ground and terminal No. 1 (Light Green/Orange wire on driver's side; Dark Green/Orange wire on passenger's side) at door lock cylinder switch harness connector. If resistance is greater than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short to ground in appropriate wire between door lock cylinder switch and BCM.
  5. If driver's door lock cylinder switch is malfunctioning, go to next step. If passenger's door lock cylinder switch is malfunctioning, go to step  7 .
  6. Measure resistance in Light Green/Orange wire between terminal No. 1 at driver's door lock cylinder switch harness connector and terminal No. 13 at BCM harness connector C4. See Figure . If resistance is 5 ohms or less, go to step  8 . If resistance is greater than 5 ohms, repair open in Light Green/Orange wire between door lock cylinder switch and BCM.
  7. Measure resistance in Dark Green/Orange wire between terminal No. 1 at passenger's door lock cylinder switch harness connector and terminal No. 3 at BCM harness connector C4. See Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Dark Green/Orange wire between door lock cylinder switch and BCM.
  8. Connect BCM harness connector C4. Connect scan tool to Data Link Connector (DLC). Using a fused jumper wire, connect terminals No. 1 and 2 at appropriate door lock cylinder switch harness connector. Using scan tool, check door disarm switch voltage. If greater than 9 volts is displayed, replace appropriate door lock cylinder switch. If 9 volts or less is display, replace BCM.
  9. Disconnect malfunctioning door lock switch harness connector. Measure voltage at terminal No. 1 (Pink wire) at appropriate door lock switch harness connector. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair power distribution circuit as necessary. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  10. If driver's door lock switch is malfunctioning, go to next step. If passenger's door lock switch is malfunctioning, go to step  12 .
  11. Turn ignition off. Disconnect Body Control Module (BCM) harness connector C4. Measure resistance in White/Light Green wire between terminal No. 4 at driver's door lock switch harness connector and terminal No. 5 at BCM harness connector C4. See Figure and Figure . If resistance is 5 ohms or less, go to step  13 . If resistance is greater than 5 ohms, repair open in White/Light Green wire between driver's door lock switch and BCM.
  12. Turn ignition off. Disconnect Body Control Module (BCM) harness connector C4. Measure resistance in White/Dark Green wire between terminal No. 4 at passenger's door lock switch harness connector and terminal No. 12 at BCM harness connector C4. See Figure and Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in White/Dark Green wire between passenger's door lock switch and BCM.
  13. Connect BCM harness connector C4. Connect scan tool to Data Link Connector (DLC). Using a fused jumper wire, connect terminals No. 1 and 4 at appropriate door lock switch harness connector. Using scan tool, check door lock switch voltage. If greater than 9 volts is displayed, replace appropriate door lock switch. If 9 volts or less is display, replace BCM.
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