Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, Front Passenger's Power Window Switch, and Relay Control Module) Input Test (2018 2019 2020)

NOTE:

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 No. C16 and No. C21 fuses are OK.
Before testing, make sure the No. D1, No. D2, No. D3, No. D4, No. D5, No. D6, No. D7, No. D11, No. D19, and No. D26 fuses are OK.
Before testing, make sure the No. E18 fuse is OK.
Before testing, make sure the headlights, parking lights, side marker lights, taillights, and horns work properly.
There are two pairs of fuses in the same circuit (No. D2 and No. D5 fuses, No. D1 and No. D4 fuses ). If one fuse is blown, make sure to check the other fuse in the same circuit. If necessary, replace the blown fuse (s).

MICU

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

2. Disconnect driver's under-dash fuse/relay box connectors E, F, G, H, M, N, 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 look 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.

NOTE: These are door lock actuator operation tests for keyless entry.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
M1	PUR	Connect battery power * to M1 (or M2), and terminal M2 (or M1) and ground with jumper wires.	Check actuator operation: The driver's door lock actuator should LOCK (or UNLOCK).	Faulty driver's door lock actuator An open or high resistance in the wire
M2	GRN
H13	BRN	Connect battery power * to H13 (or H9), and terminal H9 (or H13) and ground with jumper wires.	Check actuator operation: The front passenger's door lock actuator and right rear door lock actuator should LOCK (or UNLOCK).	Faulty front passenger's door lock actuator Faulty right rear door lock actuator An open or high resistance in the wire
H9	YEL
E15	PUR	Connect terminals F2 * and E15 (or E14), and terminal E14 (or E15) and ground with jumper wires.	Check actuator operation: The left rear door lock actuator should LOCK (or UNLOCK).	Faulty left rear door lock actuator An open or high resistance in the wire
E14	YEL
P6	BLU	Connect terminal P6 and body ground with a jumper wire momentarily.	Check actuator operation: The trunk lid opener solenoid should work.	Faulty trunk lid opener solenoid relay Faulty trunk lid opener solenoid Poor ground (G705, G706) or an open in the ground wire An open or high resistance in the wire

*: Use a fused jumper wire with an appropriate amperage fuse.

5. 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 6.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
F23	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C16 fuse An open or high resistance in the wire
F2	YEL	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B3-5 fuse An open or high resistance in the 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
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
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

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
N4	PUR	Driver's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door switch Faulty driver's door switch ground An open or high resistance in the wire
N4	PUR	Driver's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door switch A short to ground in the wire
N2	RED	Front passenger's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door switch Faulty front passenger's door switch ground An open or high resistance in the wire
N2	RED	Front passenger's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty front passenger's door switch A short to ground in the wire
E26	LT GRN	Left rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty left rear door switch Faulty left rear door switch ground An open or high resistance in the wire
E26	LT GRN	Left rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty left rear door switch A short to ground in the wire
E43	BRN	Right rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty right rear door switch Faulty right rear door switch ground An open or high resistance in the wire
E43	BRN	Right rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty right rear door switch A short to ground in the wire
E28	PNK	Left rear door lock knob switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty left rear door lock knob switch Poor ground (G701) or an open in the ground wire An open or high resistance in the wire
E28	PNK	Left rear door lock knob switch in LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty left rear door lock knob switch A short to ground in the wire
E44	PNK	Right rear door lock knob switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty right rear door lock knob switch Poor ground (G751) or an open in the ground wire An open or high resistance in the wire
E44	PNK	Right rear door lock knob switch in LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty right rear door lock knob switch A short to ground in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
E23	WHT	Trunk open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty trunk lid latch switch Poor ground (G706) or an open in the ground wire An open or high resistance in the wire
E23	WHT	Trunk closed	Measure the voltage to ground: There should be about 5 V.	Faulty trunk lid latch switch A short to ground in the wire
Q18	GRN	Shift position/mode in P	Measure the voltage to ground: There should be less than 0.2 V.	Faulty TCM Poor ground (G101) 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

Door Multiplex Control Unit

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

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

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

8. Inspect the connector and socket terminals to be sure they are all making good contact:

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 9.

9. With the connector 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 10.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
36	BLU	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 motor-control unit 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 (P/W) wire
			Check for continuity between terminal No. 36 and left rear power window switch 14P connector terminal No. 11:There should be continuity.	An open in the LIN (P/W) wire
			Check for continuity between terminal No. 36 and right rear power window switch 14P connector terminal No. 11:There should be continuity.	An open in the LIN (P/W) wire
			Check for continuity between terminal No. 36 and moonroof motor-control unit 14P connector terminal No. 12:There should be continuity.	An open in the LIN (P/W) wire
			Check for continuity to ground: There should be no continuity.	A short to ground in the LIN (P/W) wire

10. Reconnect the connector, 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 11.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
25	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D26 fuse An open or high resistance in the wire
26	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C16 fuse An open or high resistance in the wire
4	GRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. D19 fuse An open or high resistance in the wire
3	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
31	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

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
35	BRN	Driver's door key cylinder switch in LOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door key cylinder switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
35	BRN	Driver's door key cylinder switch in neutral or UNLOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door key cylinder switch A short to ground in the wire
34	LT BLU	Driver's door key cylinder switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door key cylinder switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
34	LT BLU	Driver's door key cylinder switch in neutral or LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door key cylinder switch An open or high resistance in the wire
33	RED	Driver's door lock knob switch in LOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door lock knob switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
33	RED	Driver's door lock knob switch in UNLOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door lock knob switch A short to ground in the wire
32	WHT	Driver's door lock knob switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door lock knob switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
32	WHT	Driver's door lock knob switch in LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door lock knob switch A short to ground in the wire
24	GRY	Trunk lid opener switch button pressed.	Measure the voltage to ground: There should be less than 0.2 V.	Faulty trunk lid opener switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
24	GRY	Trunk lid opener switch button released.	Measure the voltage to ground: There should be about 5 V.	Faulty trunk lid opener switch A short to ground in the wire

Front Passenger's Power Window Switch

11. Turn the vehicle to the OFF (LOCK) mode, open and close the driver's door.

12. Disconnect the front passenger's power window switch 37P connector.

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

13. 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 14.

14. With the connector 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 15.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
34	BLU	Disconnect these connectors: Power window master switch 37P connector Left rear power window switch 14P connector Right rear power window switch 14P connector Moonroof motor-control unit 14P connector	Check for continuity between terminal No. 34 and power window master switch 37P connector terminal No. 36:There should be continuity.	An open in the LIN (P/W) wire
			Check for continuity between terminal No. 34 and left rear power window switch 14P connector terminal No. 11:There should be continuity.	An open in the LIN (P/W) wire
			Check for continuity between terminal No. 34 and right rear power window switch 14P connector terminal No. 11:There should be continuity.	An open in the LIN (P/W) wire
			Check for continuity between terminal No. 34 and moonroof motor-control unit 14P connector terminal No. 12:There should be continuity.	An open in the LIN (P/W) wire
			Check for continuity to ground: There should be no continuity.	A short to ground in the LIN (P/W) wire

15. Reconnect the connector, 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 16.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
4	LT BLU	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. E18 fuse An open or high resistance in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
3	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G505) An open or high resistance in the ground wire
29	LT GRN	Front passenger's door lock knob switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Front passenger's door lock knob switch Poor ground (G505) or an open in the ground wire An open or high resistance in the wire
29	LT GRN	Front passenger's door lock knob switch in LOCK	Measure the voltage to ground: There should be about 5 V.	Front passenger's door lock knob switch A short to ground in the wire

Relay Control Module

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

17. Disconnect relay control module connectors B and D.

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

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

18. 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 19.

19. Reconnect the connector, 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 20.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B10	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C16 fuse An open or high resistance in the wire
B9	TAN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D11 fuse An open or high resistance in the wire
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
B7	LT BLU	Hood closed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty security hood switch Poor ground (G301) or an open in the ground wire An open or high resistance in the wire
B7	LT BLU	Hood open	Measure the voltage to ground: There should be about 5 V.	Faulty security hood switch A short to ground in the wire

20. 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.