Power lock motor. Remote keyless entry transmitter

Power lock motor

Before you proceed with this diagnosis, confirm proper power lock switch, Central Timer Module (CTM) and power lock switch output circuit operation.

See Power Lock Switch and Central Timer Module in the Diagnosis and Testing section of this group. Remember, the CTM circuitry controls the output to each of the power lock motors. For circuit descriptions and diagrams, refer to 8W-61 - Power Door Locks in Group 8W - Wiring Diagrams.

(1) Check each power lock motor for correct operation while moving the power lock switch to both the Lock and Unlock positions. If all of the power lock motors are inoperative, go to Step 2. If one power lock motor is inoperative, go to Step 3.

(2) If all of the power lock motors are inoperative, the problem may be caused by one shorted motor.

Unplugging a shorted power lock motor from the power lock circuit will allow the good power lock motor to operate. Unplug each power lock motor wire harness connector, one at a time, and recheck both the lock and unlock functions by operating the power lock switch. If all of the power lock motors are still inoperative after the above test, check for a short or open circuit between the power lock motors and the CTM. If unplugging one power lock motor causes the other motor to become functional, go to Step 3 to test the unplugged motor.

(3) Once it is determined which power lock motor is inoperative, that motor can be tested as follows.

Unplug the wire harness connector at the inoperative power lock motor. Apply 12 volts to the motor terminals to check its operation in one direction. Reverse the polarity to check the operation in the other direction.

If OK, repair the short or open circuits between the power lock motor and the CTM as required. If not OK, replace the faulty power lock motor.

Remote keyless entry transmitter

(1) Replace the Remote Keyless Entry (RKE) transmitter batteries. See Remote Keyless Entry Transmitter Battery Replacement in the Service Procedures section of this group. Test each of the transmitter functions. If OK, discard the faulty batteries.

If not OK, go to Step 2.

(2) Program the suspect RKE transmitter and another known good transmitter into the RKE module.

Use a DRB scan tool, as described in the proper Diagnostic Procedures manual. See Remote Keyless Entry Transmitter Programming in the Service Procedures section of this group.

(3) Test the RKE system operation with both transmitters. If both transmitters fail to operate the power lock system, use a DRB scan tool and the proper Diagnostic Procedures manual for further diagnosis of the RKE system. If the known good transmitter operates the power locks and the suspect transmitter does not, replace the faulty transmitter.

NOTE: Be certain to perform the Remote Keyless Entry Transmitter Programming procedure again following this test. This procedure will erase the access code of the test transmitter from the RKE receiver.