VTSS Will Not Disarm With Tailgate Cylinder Lock Switch

Possible Causes:

• Disarm Switches Disabled
• DTC's Present
• Tailgate Switch Ground Circuit Open
• Tailgate Cylinder Lock Switch MUX Wire Open
• Tailgate Cylinder Lock Switch Open
• Body Control Module

Testing

1. With the DRBIII(R), read DTC's. Are there any Tailgate related codes present? If yes, see POWER DOOR LOCKS/RKE  symptom list 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 Tailgate Cylinder Lock Switch connector. Turn the ignition and all lights off. Measure the resistance between ground and the Tailgate Switch Ground circuit. Is the resistance below 15.0 ohms? If yes, go to next step. If no, repair the Tailgate Switch Ground circuit for an open. Perform VTSS VERIFICATION TEST  .
4. Turn the ignition on. Measure the voltage between ground and the Tailgate Cylinder Lock Switch circuit. Is the voltage above 4.9 volts? If yes, replace the Tailgate Cylinder Lock Switch. Perform VTSS VERIFICATION TEST  . If no, go to next step.
5. Connect a jumper wire between the Tailgate Cylinder Lock Switch MUX circuit in the Lock Motor connector and ground. Disconnect the Body Control Module C2 connector. Measure the resistance between ground and the Tailgate Cylinder Lock Switch MUX circuit in the BCM C2 connector. Is the resistance below 5.0 ohms? If yes, replace and program the Body Control Module. See BODY CONTROL MODULE (BCM)  in REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  . If no, repair the Tailgate Cylinder Lock Switch MUX wire for an open. Perform VTSS VERIFICATION TEST  .