Headlamp Dimmer Switch: Testing and Inspection

MULTI-FUNCTION SWITCH

WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.





1. Remove the multi-function switch from the switch mounting housing on the steering column. Multifunction Switch - Removal.
2. Disconnect the wire harness connector from the back of the multi-function switch.
3. Using an ohmmeter, test the resistance between the terminals of the switch as shown in the Multi-Function Switch Tests table.





4. If the switch fails any of the tests, replace the ineffective multi-function switch as required.