Combination Switch Control Unit Input Test
- Remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
- Disconnect the 8P connector from the wiper/washer switch.
- 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, 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.
COMBINATION SWITCH CONTROL UNIT INPUT TEST - REFERENCE DATACavity Wire Test condition Test: Desired result Possible cause if result is not obtained 3 BLK Under all conditions Check for voltage to ground:
There should be less than 1 V.- Poor ground (G503, G601)
- An open in the wire
8 WHT/RED Under all conditions Check for voltage to ground:
There should be battery voltage.- Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box
- An open in the wire
7 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
- Disconnect the 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.
COMBINATION SWITCH CONTROL UNIT INPUT TEST - REFERENCE DATA
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if result is not obtained |
|---|---|---|---|---|
| 4 | LT GRN | Under all conditions | Check for continuity between No. 4 terminal and the under-dash fuse/relay box connector X (39P) No. 27 terminal: There should be continuity. |
An open in the wire |