Combination Switch Control Unit Input Test
- Before troubleshooting the wiper/washer system, troubleshoot B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
- Remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
- Remove the self-tapping screws, then disconnect the 12P connector (A) from the combination switch (B).
- Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 5.
- With the connector still disconnected, make these input tests at the connector.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 6
PROBLEM SYMPTOM CHARTCavity Wire Test condition Test: Desired result Possible cause if result is not obtained 3 LT GRN Under all conditions Check for continuity between the No. 3 terminal and under-dash fuse/relay box connector X (39P) No 27 terminal:
There should be continuity.An open in the wire Disconnect the under-dash fuse/relay box connector X (39P) Check for continuity between the No. 3 terminal and body ground:
There should be no continuity.A short in the wire - Reconnect the 12P connector to the combination switch, turn the ignition switch ON (II) and make these input tests at the connector.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, replace the combination switch control unit.
PROBLEM SYMPTOM CHARTCavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 12 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V.- Poor ground (G401)
- An open in the wire
7 WHT/RED Under all conditions Check for voltage to ground:
There should be battery voltage.- Blown No. 15 (40 A) fuse in the under-hood fuse/relay box
- Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box
- An open in the wire
1 YEL Ignition switch ON (II) Check for voltage to ground:
There should be battery voltage.- Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box
- An open in the wire
11 GRN/WHT Wiper switch on low and high Check for voltage to ground:
There should be less than 1V.- Faulty combination control unit
- Poor ground (G401)
Wiper switch OFF Check for voltage to ground:
There should be more than 5 V.Open in the wire