Combination Switch Control Unit Input Test
NOTE:
Check the No. 22 (120 A) No. 23 (60 A), No. 15(40 A) fuse in the under-hood fuse/relay box before testing.
- Before troubleshooting the combination switch control unit, troubleshoot the multiplex integrated control system first, using B-CAN System Diagnosis Test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
- Turn the ignition switch to LOCK (0).
- Remove the steering column covers (see REMOVAL ).
- Disconnect the 12P connector from the 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 6.
- Reconnect all the connector to the control unit, and do the following input tests:
- 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 combination switch (see COMBINATION SWITCH REPLACEMENT ).
WIRE TEST CONDITION REFERENCE CHART
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| 12 | BLK | In all ignition switch positions | Measure the voltage to ground: There should be less than 0.2 V. |
|
| 7 | WHT/RED | Under all conditions | Measure the voltage to ground: There should be battery voltage. |
|
| 1 | YEL | Ignition switch ON (II) | Measure the voltage to ground: There should be battery voltage. |
|
| 3 | LT GRN | Under all conditions | Check for continuity between terminal No. 3 and under-dash fuse/relay box connector X (39P) terminal No. 27: There should be continuity. |
An open or high resistance in the wire |