Multi-Function Thermal Sensor / Switch: Testing and Inspection

DIAGNOSIS AND TESTING - RIGHT MULTI-FUNCTION SWITCH
Be certain to perform the diagnosis for the front wiper system, front washer system, rear wiper system, and/or rear washer system before testing the right multi-function switch.

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.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, DRIVER AIRBAG, PASSENGER AIRBAG, SIDE CURTAIN AIRBAG, FRONT IMPACT SENSOR, SIDE 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 SUPPLEMENTAL RESTRAINT SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

1. Disconnect and isolate the battery negative cable.
2. Remove the right multi-function switch from the steering column and disconnect the instrument panel wire harness connector for the switch from the switch connector receptacle.

Fig. 22 Right Multi-Function Switch Tests:

3. Using an ohmmeter, check the right multi-function switch continuity and resistances at the switch terminals as shown in the Right Multi-Function Switch test chart.
4. If the right multi-function switch fails any of the continuity or resistance tests, replace the faulty right multi-function switch as required.