Sunroof - Motor Switch Binds

NO.
101

GROUP
83

SECTION

DATE: JUNE 1988

RE:
SUNROOF MOTOR/SWITCH

740/760

THIS BULLETIN APPLIES TO THE U.S. AND CANADA
REFERENCE: NONE

A binding switch for the sunroof can cause failure of the sunroof motor solenoid. Before replacing a faulty sunroof motor, perform the following test to determine if the fault in the motor is due to a faulty solenoid.

- Make sure that the motor is properly grounded.
- Make sure that one of the terminals in the 2-pole connector has current when the switch is pushed in one direction. At the same time the other terminal should be grounded. When pushing the switch in the other direction, the polarity should change between the terminals.





- If no fault is found, listen to the motor while operating the switch. If the solenoid in the motor is ok, a "click" should be heard indicating another type of fault.

- If no "clicking" sound can be heard the solenoid is faulty, most likely caused by a binding switch. In this case replace the switch along with the sunroof motor.

NOTE:
Always confirm that the sunroof switch doesn't bind before replacing the sunroof motor alone.