Wipers/Washers (MICU, Windshield Wiper Control Unit, and Relay Control Module) Input Test (2018 2019 2020)

MICU

NOTE:

Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .

1. Turn the vehicle to the OFF (LOCK) mode.

2. Disconnect driver's under-dash fuse/relay box connectors F, G, H, P, and Q.

NOTE: All connector views are shown from the wire side of the female terminals.

Courtesy of HONDA, U.S.A., INC.

3. Inspect the connectors 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 are OK, go to step 4.

4. Reconnect the connectors to the driver's under-dash fuse/relay box, 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.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
G3	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) An open or high resistance in the ground wire
H1	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) An open or high resistance in the ground wire
P2	BLK	In all power modes	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
F7	GRN	Brake pedal pressed	Measure the voltage to ground: There should be battery voltage.	Blown No. C19 fuse Faulty brake pedal position switch Faulty brake light relay An open or high resistance in the wire
F7	GRN	Brake pedal released	Measure the voltage to ground: There should be no voltage.	Faulty brake pedal position switch Faulty brake light relay A short to power in the wire
P10P3	ORNRED	Windshield wiper/washer switch (INT or LO) ON	Measure the voltage between terminals P10 and P3: There should be less than 0.2 V.	Faulty windshield wiper/washer switch An open or high resistance in the wire
P10P3	ORNRED	Windshield wiper/washer switch OFF	Measure the voltage between terminals P10 and P3: There should be about 5 V.	Faulty windshield wiper/washer switch A short to ground in the wire
P9P3	LT GRNRED	Windshield wiper/washer switch (MIST) ON	Measure the voltage between terminals P9 and P3: There should be less than 0.2 V.	Faulty windshield wiper/washer switch An open or high resistance in the wire
P9P3	LT GRNRED	Windshield wiper/washer switch OFF	Measure the voltage between terminals P9 and P3: There should be about 5 V.	Faulty windshield wiper/washer switch A short to ground in the wire
P16P3	YELRED	Windshield wiper/washer switch (LO or HI) ON	Measure the voltage between terminals P16 and P3: There should be less than 0.2 V.	Faulty windshield wiper/washer switch An open or high resistance in the wire
P16P3	YELRED	Windshield wiper/washer switch OFF	Measure the voltage between terminals P16 and P3: There should be about 5 V.	Faulty windshield wiper/washer switch A short to ground in the wire
P8P3	WHTRED	Windshield washer switch ON	Measure the voltage between terminals P8 and P3: There should be less than 0.2 V.	Faulty windshield wiper/washer switch An open or high resistance in the wire
P8P3	WHTRED	Windshield washer switch OFF	Measure the voltage between terminals P8 and P3: There should be about 5 V.	Faulty windshield wiper/washer switch A short to ground in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
Q18	GRN	Shift position/mode in P	Measure the voltage to ground: There should be less than 0.2 V.	Faulty TCM Poor ground (G401) or an open in the ground wire An open or high resistance in the wire
Q18	GRN	Shift position/mode in any position/mode other than P	Measure the voltage to ground: There should be about 5 V.	Faulty TCM A short to ground in the wire

5. Turn the vehicle to the OFF (LOCK) mode.

6. Disconnect the connectors from the driver's under-dash fuse/relay box, 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 7.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
F17	YEL	Disconnect the windshield wiper control unit/motor 6P connector	Check for continuity between terminal F17 and windshield wiper control unit/motor 6P connector terminal No. 4: There should be continuity	An open or high resistance in the wire

Relay Control Module

7. Turn the vehicle to the OFF (LOCK) mode.

8. Disconnect relay control module connectors B and D.

NOTE: All connector views are shown from the wire side of the female terminals.

Courtesy of HONDA, U.S.A., INC.

9. Inspect the connectors 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 are OK, go to step 4.

10. Reconnect the connectors to the relay control module, 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.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B1	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
D12	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G301) An open or high resistance in the ground wire
D2	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C18 fuse An open or high resistance in the wire

11. Turn the vehicle to the OFF (LOCK) mode.

12. Disconnect the connectors from the relay control module, 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 13.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
D3	GRN	Under all conditions	Connect terminals D3 and D2 with a jumper wire: The windshield washer motor should run.	Faulty windshield washer motor Poor ground (G201) or an open in the ground wire An open or high resistance in the wire

Windshield Wiper Control Unit

13. Turn the vehicle to the OFF (LOCK) mode.

14. Disconnect the windshield wiper control unit/motor 6P connector.

Courtesy of HONDA, U.S.A., INC.

15. 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 16.

16. Reconnect the connector to the control unit, 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 17.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
2	YEL	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C31 fuse An open or high resistance in the wire
6	BLU	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C7 fuse An open or high resistance in the wire
1	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire

17. Turn the vehicle to the OFF (LOCK) mode.

18. Disconnect the connector from the windshield wiper control unit/motor, 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 19.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
4	YEL	Disconnect driver's under-dash fuse/relay box connector F (32P)	Check for continuity between terminal No. 4 and driver's under-dash fuse/relay box connector F (32P) terminal No. 17: There should be continuity	An open or high resistance in the wire

19. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the MICU) . If input failures are related to a particular control unit, replace the control unit.