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Drivers Door Key Fails To Disarm VTSS

Possible Causes are:

  1. Using the DRBIII(R) in VTSS, Sensor Display, read the Driver Key Cylinder Sw voltage. Rotate the key in the Door Key Cylinder from the normal position to the unlock position. Does the Driver Key Cylinder Sw voltage change from 5.0 to 1.6 volts? If yes, go to next step. If no, go to step  3 .
  2. Reset the DDM by removing and reinstalling the JB POWER Fuse No. 12 in the Power Distribution Center. Attempt to disarm the VTSS using the door key. Can the VTSS now be disarmed using the door key? If yes, resetting the Driver Door Module has corrected the problem. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, replace the Driver Door Module. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
  3. Disconnect the Driver Cylinder Lock Switch harness connector. Using a 12-volt test light connected to 12 volts, check the Driver Cylinder Lock Switch Ground circuit. Does the test light illuminate? If yes, go to next step. If no, repair the Driver Cylinder Lock Switch Ground circuit for an open. Perform VTSS VERIFICATION TEST 1A  under VERIFICATION TESTS.
  4. Disconnect the Driver Door Module C1 harness connector. Disconnect the Driver Cylinder Lock Switch harness connector. Using a 12-volt test light connected to 12 volts, check the Driver Cylinder Lock Switch Sense circuit. Does the test light illuminate? If yes, repair the Driver Door Cylinder Lock Switch Sense circuit for a short to ground. Perform VTSS VERIFICATION TEST 1A  under VERIFICATION TESTS. If no, go to next step.
  5. Disconnect the Driver Door Module C1 harness connector. Disconnect the Driver Cylinder Lock Switch harness connector. Measure the resistance of the Sense circuit. Is the resistance less than 5 ohms? If yes, replace the Driver Cylinder Lock Switch. Perform VTSS VERIFICATION TEST 1A  under VERIFICATION TESTS. If no, repair the Driver Cylinder Lock Switch Sense circuit for an open. Perform VTSS VERIFICATION TEST 1A  under VERIFICATION TESTS.
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