Wipers/Washers (MICU) Input Test (2017 2018 2019)

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 .
• Before testing, make sure the fuses associated with the system is OK.

1. Press the engine start/stop button to select the OFF mode.

2. Disconnect under-dash fuse/relay box connectors.

UNDER-DASH FUSE/RELAY BOX CONNECTOR D (44P) (female terminals): 

UNDER-DASH FUSE/RELAY BOX CONNECTOR E (38P) (female terminals): 

UNDER-DASH FUSE/RELAY BOX CONNECTOR F (18P) (female terminals): 

UNDER-DASH FUSE/RELAY BOX CONNECTOR M (12P) (female terminals): 

UNDER-DASH FUSE/RELAY BOX CONNECTOR N (20P) (female terminals): 

UNDER-DASH FUSE/RELAY BOX CONNECTOR P (24P) (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. With the connectors still disconnected, 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
E16	YEL	Under all conditions	Connect terminals M9 and E34, and terminal E16 and body ground with jumper wires: The windshield wiper motor should run at high speed.	Faulty relay circuit board Faulty windshield wiper motor Poor ground (G352) or an open in the ground wire An open or high resistance in the wire
N9 N11	BLU BLK	Windshield wiper/washer switch (Intermittent dwell time controller) turned ON.	Measure the resistance between terminals N9 and N11: The resistance should vary between 0 to 1 kΩ.	Faulty windshield wiper/washer switch An open or high resistance in the ground wire A short to ground in the wire
E15	GRY	Run the windshield wiper motor by connecting terminals M9 and E34, and terminal E16 and body ground with jumper wires.	Connect terminal E15 to body ground with a jumper wire: The windshield wiper motor speed should change from high speed to low speed.	Faulty relay circuit board Faulty windshield wiper motor An open or high resistance in the wire
E28	RED	Run the windshield wiper motor by connecting terminals M9 and E34, and terminal E16 and body ground with jumper wires.	Check for continuity to ground when a wiper is PARK position and there is no continuity to ground in the other position.	Faulty windshield wiper motor An open or high resistance in the wire

5. Reconnect the connectors to the 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, the MICU must be faulty; replace the under-dash fuse/relay box .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
M9	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
F2	WHT	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
D14	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G601) An open or high resistance in the ground wire
D42	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G601) An open or high resistance in the ground wire
P1	BLK	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

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
E7	PUR	Brake pedal pressed	Measure the voltage to ground: There should be battery voltage.	Faulty brake pedal position switch An open or high resistance in the wire
		Brake pedal released	Measure the voltage to ground: There should be no voltage.	Faulty brake pedal position switch A short to power in the wire
N3 N11	TAN BLK	Windshield wiper/washer switch (INT or LO) ON	Measure the voltage to ground: There should be less than 0.2 V.	Faulty windshield wiper/washer switch An open or high resistance in the wire
		Windshield wiper/washer switch OFF	Measure the voltage to ground: There should be about battery voltage.	Faulty windshield wiper/washer switch A short to ground in the wire
N13 N11	PUR BLK	Windshield wiper/washer switch (MIST) ON	Measure the voltage to ground: There should be less than 0.2 V.	Faulty windshield wiper/washer switch An open or high resistance in the wire
		Windshield wiper/washer switch OFF	Measure the voltage to ground: There should be about battery voltage.	Faulty windshield wiper/washer switch A short to ground in the wire
N2 N11	WHT BLK	Windshield wiper/washer switch (LO or HI) ON	Measure the voltage to ground: There should be less than 0.2 V.	Faulty windshield wiper/washer switch An open or high resistance in the wire
		Windshield wiper/washer switch OFF	Measure the voltage to ground: There should be about battery voltage.	Faulty windshield wiper/washer switch A short to ground in the wire
N12 N11	YEL BLK	Windshield washer switch ON	Measure the voltage to ground: There should be less than 0.2 V.	Faulty windshield wiper/washer switch An open or high resistance in the wire
		Windshield washer switch OFF	Measure the voltage to ground: There should be about battery voltage.	Faulty windshield wiper/washer switch A short to ground in the wire
E27	BLU	Shift position/mode in P	Measure the voltage to ground: There should be less than 0.2 V.	Faulty or improperly adjusted transmission range switch Faulty PCM An open or high resistance in the wire
		Shift position/mode in any position other than P	Measure the voltage to ground: There should be about 5 V.	Faulty or improperly adjusted transmission range switch Faulty PCM A short to ground in the wire