Power Mirrors (Power Window Master Switch) Input Test (2017 2018 2019 2020)

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 - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2017 2018 2019 2020) .

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

2. Disconnect the power window master switch 37P connector.

Power window master switch 37P connector (female terminals)

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

3. 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.

4. Reconnect the 37P 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 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
26	GRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C16 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
25	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D26 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
4	WHT	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D19 (20 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
3	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G506) An open or high resistance in the ground wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
31	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
11	BLU	Vehicle ON mode, power mirror switch in EXTEND position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
11	BLU	Vehicle ON mode, power mirror switch in RETRACT position	Measure the voltage to ground: There should be about 5 V.	Faulty power mirror switch A short to ground in the wire

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

6. Disconnect the connector from the power window master 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, replace the power window master switch .

NOTE:

After replacing the power window master switch, do the resetting the power window control unit .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
8-9	WHT-GRN	Vehicle ON mode, connect terminals No. 4 to No. 8 (or No. 9) and terminal No. 9 (or No. 8) to body ground with a jumper wire NOTE: if the mirror stops moving, disconnect battery power immediately.	Check the retract actuator operation: The left mirror should retract (or extend).	Faulty left retract actuator An open or high resistance in the wire
15	TAN	Vehicle ON mode, connect terminals No. 4 and No. 15 with a jumper wire	Check the left power mirror defogger operation: The left power mirror defogger should work (the inside lower edge becomes warm).	Faulty left power mirror defogger Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
37	BRN	Vehicle ON mode, connect terminals No. 26 and No. 37 with a jumper wire	Check the power mirror switch light operation: The power mirror switch light should come on.	Faulty LED Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
36	GRY	Disconnect these connectors: Front passenger's power window switch 37P connector Left rear power window switch 14P connector Right rear power window switch 14P connector Moonroof control unit/motor 14P connector	Check for continuity between terminal No. 36 and front passenger's power window switch 37P connector terminal No. 34: There should be continuity.	An open in the LIN(WINDOW) wire
			Check for continuity between terminal No. 36 and left rear power window switch 14P connector terminal No. 9: There should be continuity.	Faulty driver's under-dash fuse/relay box An open in the LIN(WINDOW) wire
			Check for continuity between terminal No. 36 and right rear power window switch 14P connector terminal No. 9: There should be continuity.	Faulty driver's under-dash fuse/relay box An open in the LIN(WINDOW) wire
			Check for continuity between terminal No. 36 and moonroof control unit/motor 14P connector terminal No. 12: There should be continuity.	An open in the LIN(WINDOW) wire
			Check for continuity to ground: There should be no continuity.	A short to ground in the LIN(WINDOW) wire