Turn the ignition switch to LOCK (0), 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).

Fig 1: Identifying Combination Switch Control Unit 8P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 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, go to step 5.

DTC TEST REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
3	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the ground wire
8	WHT	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 (10 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
7	PNK	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 or high resistance in the wire

Disconnect the 8P connector from the wiper/washer switch, 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 wiper/washer switch.

DTC TEST REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
4	LT GRN	Under all conditions	Check for continuity between terminal No. 4 and driver's under-dash fuse/relay box connector N (45P) terminal No. 28: There should be continuity.	An open or high resistance 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

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Combination Switch Control Unit Input Test