Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, and Front Passenger's Power Window Switch) Input Test (2018-19)

NOTE:

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 (2018-19) .
Before testing, make sure the No. A29 (10 A) fuse in the under-hood fuse/relay box is OK.
Before testing, make sure the No. B1 (7.5 A), B5 (7.5 A), B19 (10 A), B20 (10 A), B21 (10 A), B22 (10 A), B23 (10 A), B32 (20 A), B33 (20 A), B41 (10 A), and No. B42 (20 A) fuses in the under-dash fuse/relay box are 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. B21 and No. B23 fuses, No. B19 and No. B22 fuses, No. B20 and No. B41 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 under-dash fuse/relay box connectors.Under-dash fuse/relay box connector A (5P) (female terminals) :

Under-dash fuse/relay box connector D (44P) (female terminals) :

Under-dash fuse/relay box connector E (36P) (female terminals) :

Under-dash fuse/relay box connector F (18P) (female terminals) :

Under-dash fuse/relay box connector P (24P) (female terminals) :

Under-dash fuse/relay box connector S (18P) (female terminals) :

Under-dash fuse/relay box connector T (10P) (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 result is not obtained
T2	GRY	Connect battery power *1 to T2 (or T8), and terminal T8 (or T2) 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
T8	YEL
S3	RED	Connect battery power *1 to S3 (or S6), and terminal S6 (or S3) 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
S6	LT GRN
D2	TAN	Connect battery power *1 to D2 (or D11), and terminal D11 (or D2) 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
D11	YEL
D17	ORN	Connect battery power *1 to D17 with a jumper wire.	Check actuator operation: The trunk lid release actuator should work.	Faulty trunk lid release actuator Poor ground (G403) or an open in the ground wire An open or high resistance in the wire
E34	YEL	Under all conditions	Connect to ground with a jumper wire: The horns should sound.	Blown No. A18 (10 A) fuse in the under-hood fuse/relay box Faulty horn relay Faulty horn An open or high resistance in the wire
E17 *2	GRY	TCM 58P connector disconnected	Check for continuity between terminal E17 and the TCM 58P connector terminal No. 32: There should be continuity.	An open or high resistance in the wire
P22	PNK	Keyless access/TPMS control unit connector A (32P) disconnected	Check for continuity between terminal P22 and the keyless access/TPMS control unit connector A (32P) terminal No. 2: There should be continuity.	An open or high resistance in the wire

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

*2: V6 engine

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 result is not obtained
E23	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A29 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
A1	BRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. A2-5 (30 A) fuse in the under-hood fuse/relay box Faulty under-dash subrelay box An open or high resistance in the wire
F1	RED	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A2-3 (60 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
E6	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G202) An open or high resistance in the ground wire
D3	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G403) An open or high resistance in the ground wire
D30	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G404) 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 (G307) An open or high resistance in the ground wire
D22	BRN	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
D22	BRN	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 Faulty MICU
S13	LT GRN	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
S13	LT GRN	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 Faulty MICU
D23	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
D23	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 Faulty MICU
S14	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
S14	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 Faulty MICU
D29	GRY	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 (G404) or an open in the ground wire An open or high resistance in the wire
D29	GRY	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 Faulty MICU
S17	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 (G501) or an open in the ground wire An open or high resistance in the wire
S17	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 Faulty MICU
D37	WHT	Trunk open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty trunk lid latch switch Poor ground (G403) or an open in the ground wire An open or high resistance in the wire
D37	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 Faulty MICU
E15	PNK	Hood closed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty security hood switch Poor ground (G203) or an open in the ground wire An open or high resistance in the wire
E15	PNK	Hood open	Measure the voltage to ground: There should be about 5 V.	Faulty security hood switch A short to ground in the wire Faulty MICU
E17 *	GRY	Shift position/mode in P	Measure the voltage to ground: There should be less than 0.2 V.	Faulty transmission range switch Poor ground (G101) or an open in the ground wire An open or high resistance in the wire
E17 *	GRY	Shift position/mode in any other position/mode than P	Measure the voltage to ground: There should be about 5 V.	Faulty transmission range switch A short to ground in the wire Faulty MICU

*: L4 engine

Door Multiplex Control Unit

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

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

POWER WINDOW MASTER SWITCH 37P CONNECTOR (female terminals)

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 result is not obtained
36	LT BLU	Disconnect the front passenger's power window switch 37P connector and the 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 (P/W) 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 (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 result is not obtained
25	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. B1 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
26	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A29 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
4	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B32 (20 A) fuse in the 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 (G306) An open or high resistance in the ground wire
31	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G306) An open or high resistance in the ground wire
35	PUR	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 (G306) or an open in the ground wire An open or high resistance in the wire
35	PUR	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 Faulty power window master switch
34	RED	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 (G306) or an open in the ground wire An open or high resistance in the wire
34	RED	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 Faulty power window master switch
33	BLU	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 (G306) or an open in the ground wire An open or high resistance in the wire
33	BLU	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 Faulty power window master switch
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 (G306) 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 Faulty power window master switch

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.

FRONT PASSENGER'S POWER WINDOW SWITCH 37P CONNECTOR (female terminals)

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 result is not obtained
34	LT BLU	Disconnect the power window master switch 37P connector and the moonroof control unit/motor 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 moonroof control unit/motor 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	GRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B33 (20 A) fuse in the 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 (G501) An open or high resistance in the ground wire
29	PUR	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 (G301) or an open in the ground wire An open or high resistance in the wire
29	PUR	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 Faulty front passenger's power window switch

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