Seat Temperature Switch: Testing and Inspection
HEATED SEAT SWITCHWARNING: DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE 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 .
1. If the problem being diagnosed involves inoperative heated seat switch back lighting and the heated seat elements do heat, disconnect the inoperative switch and check for continuity between the ground pin at the heated seat switch connector and ground. If there is no continuity, repair an open wire between ground and the heated seat switch connector. If there is continuity, replace the inoperative heated seat switch. If the problem being diagnosed involves a heated seat switch indicator lamp that remains illuminated after the heated seat has been turned Off. Also refer to the Body Diagnostic Information for additional diagnosis and testing procedures.
2. Check the fused ignition switch output (run) fuse in the Power Distribution Center (PDC). If OK, go to Step 3. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
3. Turn the ignition switch to the On position. Check for battery voltage at the fused ignition switch output (run) fuse in the PDC. If OK, go to Step 4. If not OK, repair the open fused ignition switch output (run) circuit to the ignition switch as required.
4. Disconnect and isolate the battery negative cable. Disconnect the wire harness connector from the connector receptacle on the back of the heated seat switch to be tested. Reconnect the battery negative cable. Turn the ignition switch to the Run position. Check for battery voltage at the fused ignition switch output (run) circuit cavity of the heated seat switch. If OK, go to Step 5. If not OK, repair the open fused ignition switch output (run) circuit to the PDC fuse as required.
5. Check the continuity and resistance values of the heated seat switch in the Neutral, Low and High positions as shown in the Heated Seat Switch Continuity chart below. If OK, Refer to ELECTRICAL/HEATED SEATS/ HEATED SEAT MODULE - DIAGNOSIS AND TESTING. Also refer to the Body Diagnostic Information for additional diagnosis and testing procedures. If not OK, replace the faulty heated seat switch.
HEATED SEAT SWITCH CONTINUITY CHART