Diagnosis And Testing - Window Switch

The Light-Emitting Diode (LED) illumination lamps for all of the power door lock/window switch paddles receive ignition current through the power window circuit breaker in the relay bank. If all of the LED's are inoperative in either or both power window and lock switch and bezel units and the power windows are inoperative, perform the diagnosis for Power Window System refer to DIAGNOSIS AND TESTING - POWER WINDOWS  . If the power windows operate, but any or all the LED's are inoperative, the power window and lock switch and bezel unit with the inoperative LED(s) is faulty and must be replaced. For circuit descriptions and diagrams, refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

1. Check the circuit breaker in the junction block. If OK, go to Step 2. If not OK, replace the faulty circuit breaker.
2. Turn the ignition switch to the On position. Check for battery voltage at the circuit breaker in the junction block. If OK, turn the ignition switch to the Off position and go to Step 3. If not OK, repair the circuit to the ignition switch as required.
3. Disconnect and isolate the battery negative cable. Remove the power door lock/window switch and bezel from the door trim panel. (Refer to TRIM PANEL ). Unplug the wire harness connector from the switch and bezel unit.
4. Test the power window switch continuity. See the Power Window Switch Continuity is correct in the Neutral, Up and Down switch positions (Fig 1 ) and Power Window Switch Continuity test table. If OK, see DIAGNOSIS AND TESTING - WINDOW MOTOR  . If not OK, replace the faulty switch and bezel.
   Fig 1: Identifying Power Door Lock/Window Switch Connector (Switch Side)

   Courtesy of DAIMLERCHRYSLER CORP.