Combination Switch Control Unit Input Test
NOTE:
Before testing, troubleshoot B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
).
- Turn the ignition switch ON (II), remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ), and the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ), then remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
- Disconnect the 8P connector from the wiper/washer switch (combination switch control unit).
- 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 4.
- Reconnect the connector to the wiper/washer switch, 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, go to step 5.
CONNECTOR TERMINALS REFERENCECavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 3 BLK Under all conditions Measure the voltage to ground:
There should be less than 0.5 V.- Poor ground(G501)
- An open in the wire
8 WHT Under all conditions Measure the voltage to ground:
There should be battery voltage.- Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box
- An open in the wire
7 YEL Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage.- Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
- An open in the wire
- Disconnect the 8P connector from the wiper/washer switch, 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, the combination switch control unit must be faulty, replace the wiper/washer switch.
CONNECTOR TERMINALS REFERENCECavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 4 LTGRN Under all conditions Check for continuity between No. 4 terminal and the driver's under-dash fuse/relay box connector N (45P) No. 28 terminal:
There should be continuity.An open in the wire Under all conditions (Driver's under-dash fuse/relay box connector N (45P) disconnected) Check for continuity to ground:
There should be no continuity.A short to ground in the wire