Jeep Cherokee

 Service Manual

Power window systems » Diagnosis and testing
Power window system

For circuit descriptions and diagrams, refer to 8W-60 - Power Windows in Group 8W - Wiring Diagrams.

ALL WINDOWS INOPERATIVE

(1) Check the circuit breaker in the junction block, as described in this group. If OK, go to Step 2. If not OK, replace the faulty circuit breaker.

(2) Disconnect and isolate the battery negative cable. Remove the driver side front door trim panel and unplug the Driver Door Module (DDM) wire harness connectors from the DDM. Check for continuity between the ground circuit cavity of the 8-way DDM wire harness connector and a good ground. If OK, go to Step 3. If not OK, repair the circuit to ground as required.

(3) Connect the battery negative cable. Turn the ignition switch to the On position. Check for battery voltage at the master switch power feed (run/acc) circuit cavity of the 12-way DDM wire harness connector.

If OK, see the diagnosis for the Door Module in this group. If not OK, repair the open circuit to the circuit breaker in the junction block as required.

ONE WINDOW INOPERATIVE

The window glass must be free to slide up and down for the power window motor to function properly.

If the glass is not free to move up and down, the motor will overload and trip the integral circuit breaker. To determine if the glass is free, disconnect the regulator plate from the glass. Then slide the window up and down by hand.

There is an alternate method to check if the glass is free. Position the glass between the up and down stops. Then, shake the glass in the door. Check that the glass can be moved slightly from side to side, front to rear, and up and down. Then check that the glass is not bound tight in the tracks. If the glass is free, proceed with the diagnosis that follows. If the glass is not free, refer to Group 23 - Body for the door window glass and hardware service and adjustment procedures.

(1) Check the power window switch continuity as described in the diagnosis for the Door Module (front doors) or Power Window Switch (rear doors) in this group. If OK and the driver side front window is inoperative, see the Power Window Motor diagnosis in this group. If OK and the inoperative window is other than the driver side front, go to Step 2. If not OK, replace the faulty door module or switch.

(2) Refer to the circuit diagrams in 8W-60 - Power Windows in Group 8W - Wiring Diagrams. Check the continuity in each circuit between the inoperative Passenger Door Module (PDM) or power window switch wire harness connector cavities and the corresponding Driver Door Module (DDM) wire harness connector cavities. If OK, see the diagnosis for the Power Window Motor in this group. If not OK, repair the open circuit(s) as required.

NOTE: All individual power window switches receive their battery and ground feeds through the Driver Door Module (DDM) and wire harness connectors.

Power window system

Circuit breaker

Door module

Power window switch

Power window motor