Combination Switch Control Unit Input Test
NOTE:
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 REMOVAL ).
- 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 4.
- With the connector still disconnected, do these input tests at the following 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.WIRE TEST CONDITION REFERENCE CHART
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 3 LT GRN In all ignition switch positions 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 Disconnect the under-dash fuse/relay box connector X (39P) Check for continuity between terminal No. 3 and body ground: There should be no continuity. A short to ground in the wire
- Reconnect the 12P connector to the combination switch, turn the ignition switch to ON (II) 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, replace the combination switch control unit (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. - Poor ground (G401)
- Faulty under-dash fuse/relay box
- An open or high resistance in the ground wire
7 WHT/RED Under all conditions Measure the 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 or high resistance in the wire
1 YEL Ignition switch ON (ID Measure the voltage to ground: There should be battery voltage. - Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box
- An open or high resistance in the wire
11 GRN/WHT Wiper switch on low and high Measure the voltage to ground: There should be less than 0.2 V. - Faulty combination control unit
- Poor ground (G401) or an open in the ground wire
Wiper switch OFF Measure the voltage to ground: There should be atleast 5 V. An open or high resistance in the wire