Diagnosis And Testing - Multi-Function Switch

Refer to the appropriate wiring information.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, SEAT BELT TENSIONER, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. SEE AIR BAG RESTRAINT SYSTEMS BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

Remove the multi-function switch from the switch mounting housing on the steering column. (Refer to MULTI-FUNCTION SWITCH - REMOVAL ).
Using an ohmmeter, perform the continuity and resistance tests at the terminals in the multi-function switch connector receptacle as shown in the Multi-Function Switch Tests chart (Fig 1 ).

Fig 1: Identifying Multi-Function Switch Terminals
Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: Multi-Function Switch Continuity Table
Courtesy of DAIMLERCHRYSLER CORP.
If the multi-function switch fails any of the continuity or resistance tests, replace the faulty switch unit as required.