VTSS Does Not Disarm With The Left Cylinder Lock Switch

Possible Causes:

• Disarm Switched Disabled
• DTC's Present
• Door Lock Switch Ground Circuit Open
• Left Cylinder Lock Switch MUX Wire Open
• Left Cylinder Lock Switch Open
• Body Control Module

Testing

1. With the DRBIII(R), read DTCs. Are there any Left Cylinder Lock Switch related codes present? If yes, see POWER DOOR LOCKS/RKE  for related problems. Perform VTSS VERIFICATION TEST  . If no, go to next step.
2. With the DRBIII(R) in Inputs/Outputs, read the Disarm SW state. Does the DRBIII(R) display Enabled? If yes, go to next step. If no, with the DRBIII(R), enable the Disarm Switches. Perform BODY VERIFICATION TEST  .
3. Disconnect the Left Door Cylinder Lock Switch connector. Turn the ignition and all lights off. Measure the resistance between ground and the Door Lock Switch Ground circuit. Is the resistance below 15.0 ohms? If yes, go to next step. If no, repair the Door Lock Switch Ground circuit for an open. Perform VTSS VERIFICATION TEST  .
4. Disconnect the Left Cylinder Lock Switch connector. Turn the ignition on. Measure the voltage between ground and the Left Cylinder Lock Switch circuit. Is the voltage above 4.9 volts? If yes, replace the Left Cylinder Lock Switch. Perform VTSS VERIFICATION TEST  . If no, go to next step.
5. Disconnect the Left Cylinder Lock Switch connector. Disconnect the Body Control Module C2 connector. Connect a jumper wire between the Left Cylinder Lock Switch MLX circuit in the Left Cylinder Lock Switch connector and ground. Measure the resistance between ground and the Left Cylinder Lock Switch MUX circuit. Is the resistance below 5.0 ohms? If yes, replace the Body Control Module. See BODY CONTROL MODULE (BCM)  in REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  . If no, repair the Left Cylinder Lock Switch MUX wire for an open. Perform VTSS VERIFICATION TEST  .