Jeep Cherokee

 Service Manual

Power lock systems » Diagnosis and testing
Remote keyless entry receiver

If the problem being diagnosed is an inoperative Remote Keyless Entry (RKE) horn chirp feature, be certain that the horn chirp feature has not been disabled.

See Remote Keyless Entry Receiver Programming in this group for the procedures. Also be certain that the vehicle horn system is operational. Refer to Group 8G - Horn Systems for more information.

If the problem being diagnosed is an inoperative RKE illuminated entry system, be certain that the interior courtesy lamp system is operational. Refer to Group 8L - Lamps for more information.

Before you proceed with diagnosis of the RKE receiver, see the diagnosis for Remote Keyless Entry Transmitter in this group. For circuit descriptions and diagrams, refer to 8W-61 - Power Door Locks in Group 8W - Wiring Diagrams.

(1) Check the fuses in the Power Distribution Center (PDC) and the junction block. If OK, go to Step 2.

If not OK, repair the shorted circuit or component as required and replace the faulty fuse.

(2) Disconnect and isolate the battery negative cable. Remove the Remote Keyless Entry (RKE) receiver from the headliner. Unplug the wire harness connector from the RKE receiver.

(3) Check the wire harness connector and the receptacle in the RKE receiver for loose, corroded, or damaged terminals and pins. If OK, go to Step 4. If not OK, repair as required.

(4) Check for continuity between each of the two ground circuit cavities of the RKE receiver wire harness connector and a good ground. In each case, there should be continuity. If OK, go to Step 5. If not OK, repair the circuit to ground as required.

(5) Connect the battery negative cable. Check for battery voltage at each of the two fused B(+) circuit cavities of the RKE receiver wire harness connector.

If OK, go to Step 6. If not OK, repair the open circuit to the PDC or the junction block as required.

(6) If the problem being diagnosed involves only the RKE horn chirp feature, go to Step 10. If the problem being diagnosed involves only the RKE illuminated entry feature, go to Step 9. If the problem being diagnosed involves only the RKE power lock feature, go to Step 7.

(7) Disconnect and isolate the battery negative cable. Unplug the 8-way Passenger Door Module (PDM) wire harness connector. Check for continuity between the lock request circuit cavity of the RKE receiver wire harness connector and a good ground.

Repeat the test between the unlock request circuit cavity of the RKE receiver wire harness connector and a good ground. In each case, there should be no continuity. If OK, go to Step 8. If not OK, repair the shorted circuit as required.

(8) Check for continuity between the lock request circuit cavities of the RKE receiver wire harness connector and the 8-way PDM wire harness connector.

Repeat the test between the unlock request circuit cavities of the RKE receiver wire harness connector and the 8-way PDM wire harness connector. In each case, there should be continuity. If OK, replace the faulty RKE receiver. If not OK, repair the open circuit as required.

(9) Check for continuity between the door ajar circuit cavity of the RKE receiver wire harness connector and a good ground with the driver door closed.

There should be no continuity until the driver door is opened. If OK, replace the faulty RKE receiver. If not OK, repair the circuit or replace the faulty driver door ajar switch as required.

(10) Unplug the horn relay from the junction block. Check for continuity between the horn relay output circuit cavity of the RKE receiver wire harness connector and a good ground. There should be no continuity. If OK, go to Step 11. If not OK, repair the short circuit to the horn relay as required.

(11) Check for continuity between the horn relay output circuit cavity of the RKE receiver wire harness connector and the junction block cavity for the horn relay coil ground terminal (85). There should be continuity. If OK, replace the faulty RKE receiver. If not OK, repair the open circuit to the junction block as required.

Power lock system and remote keyless entry system

Door module

Power lock motor

Remote keyless entry transmitter

Remote keyless entry receiver