MICU 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) .

MICU

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

2. Disconnect driver's under-dash fuse/relay box connectors.

Driver's under-dash fuse/relay box connector E (44P) (female terminals):

Driver's under-dash fuse/relay box connector G (16P) (female terminals):

Driver's under-dash fuse/relay box connector H (13P) (female terminals):

Driver's under-dash fuse/relay box connector K (8P) (female terminals):

Driver's under-dash fuse/relay box connector M (8P) (female terminals):

Driver's under-dash fuse/relay box connector P (24P) (female terminals):

Driver's under-dash fuse/relay box connector F (31P) (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
G1	PNK	Disconnect relay control module connector B (16P)	Check for continuity between terminal G1 and relay control module connector B (16P) terminal No. 15: There should be continuity.	An open in the B-CAN wire
G2	BLU	Disconnect relay control module connector B (16P)	Check for continuity between terminal G2 and relay control module connector B (16P) terminal No. 16: There should be continuity.	An open in the B-CAN wire
H5	PNK	Disconnect the power window master switch 37P connector	Check for continuity between terminal H5 and power window master switch 37P connector terminal No. 28: There should be continuity.	An open in the B-CAN wire
H10	BLU	Disconnect the power window master switch 37P connector	Check for continuity between terminal H10 and power window master switch 37P connector terminal No. 30: There should be continuity.	An open in the B-CAN wire
H5	PNK	Disconnect audio-navigation unit connector A (24P)	Check for continuity between terminal H5 and audio-navigation unit connector A (24P) terminal No. 4: There should be continuity.	An open in the B-CAN wire
H10	BLU	Disconnect audio-navigation unit connector A (24P)	Check for continuity between terminal H10 and audio-navigation unit connector A (24P) terminal No. 2: There should be continuity.	An open in the B-CAN wire
H5	PNK	Disconnect keyless access/TPMS control unit connector C (20P)	Check for continuity between terminal H5 and keyless access/TPMS control unit connector C (20P) terminal No. 1: There should be continuity.	An open in the B-CAN wire
H10	BLU		Check for continuity between terminal H10 and keyless access/TPMS control unit connector C (20P) terminal No. 11: There should be continuity.	An open in the B-CAN wire
G1	PNK	Disconnect gauge control module connector A (32P)	Check for continuity between terminal G1 and gauge control module connector A (32P) terminal No. 25: There should be continuity.	An open in the B-CAN wire
G2	BLU	Disconnect gauge control module connector A (32P)	Check for continuity between terminal G2 and gauge control module connector A (32P) terminal No. 26: There should be continuity.	An open in the B-CAN wire

*1: With automatic wiper

*2: With ventilated seat

*3: Without ventilated seat

*4: With second row seat heater

*5: With BSI

*6: With MVCS

*7: With multipurpose camera unit

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
H5	PNK	Disconnect climate control unit connector B (28P)	Check for continuity between terminal H5 and climate control unit connector B (28P) terminal No. 9: There should be continuity.	An open in the B-CAN wire
H10	BLU	Disconnect climate control unit connector B (28P)	Check for continuity between terminal H10 and climate control unit connector B (28P) terminal No. 10: There should be continuity.	An open in the B-CAN wire
H5	PNK	Disconnect the headlight leveling control unit 12P connector	Check for continuity between terminal H5 and headlight leveling control unit 12P terminal No. 9: There should be continuity.	An open in the B-CAN wire
H10	BLU		Check for continuity between terminal H10 and headlight leveling control unit 12P terminal No. 10: There should be continuity.	An open in the B-CAN wire
E31	PNK	Disconnect power seat control unit connector A (20P)	Check for continuity between terminal E31 and power seat control unit connector A (20P) terminal No. 16: There should be continuity.	An open in the B-CAN wire
E32	TAN	Disconnect power seat control unit connector A (20P)	Check for continuity between terminal E32 and power seat control unit connector A (20P) terminal No. 17: There should be continuity.	An open in the B-CAN wire
G1* 1	PNK	Disconnect the automatic lighting/rain sensor 5P connector	Check for continuity between terminal G1 and automatic lighting/rain sensor 5P connector terminal No. 4: There should be continuity.	An open in the B-CAN wire
G2* 1	BLU	Disconnect the automatic lighting/rain sensor 5P connector	Check for continuity between terminal G2 and automatic lighting/rain sensor 5P connector terminal No. 3: There should be continuity.	An open in the B-CAN wire
H5	PNK	Disconnect the parking and back-up control unit 24P connector	Check for continuity between terminal H5 and parking and back-up control unit 16P connector terminal No. 9: There should be continuity.	An open in the B-CAN wire
H10	BLU		Check for continuity between terminal H10 and parking and back-up control unit 16P connector terminal No. 2: There should be continuity.	An open in the B-CAN wire
H5* 6	PNK	Disconnect the multi view camera unit connector A (20P)	Check for continuity between terminal H5 and multi view camera unit connector A (20P) terminal No. 19: There should be continuity.	An open in the B-CAN wire
H10* 6	BLU	Disconnect the multi view camera unit connector A (20P)	Check for continuity between terminal H10 and multi view camera unit connector A (20P) terminal No. 20: There should be continuity.	An open in the B-CAN wire

*1: With automatic wiper

*2: With ventilated seat

*3: Without ventilated seat

*4: With second row seat heater

*5: With BSI

*6: With MVCS

*7: With multipurpose camera unit

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
E31* 2	PNK	Disconnect the ventilated seat control unit 14P connector	Check for continuity between terminal E31 and ventilated seat control unit 14P connector terminal No. 11: There should be continuity.	An open in the B-CAN wire
E32* 2	TAN	Disconnect the ventilated seat control unit 14P connector	Check for continuity between terminal E32 and ventilated seat control unit 14P connector terminal No. 10: There should be continuity.	An open in the B-CAN wire
E31* 3	PNK	Disconnect the front seat heater control unit 14P connector	Check for continuity between terminal E31 and front seat heater control unit 14P connector terminal No. 11: There should be continuity.	An open in the B-CAN wire
E32* 3	TAN	Disconnect the front seat heater control unit 14P connector	Check for continuity between terminal E32 and front seat heater control unit 14P connector terminal No. 10: There should be continuity.	An open in the B-CAN wire
E31* 4	PNK	Disconnect the second row seat heater control unit 14P connector	Check for continuity between terminal E31 and second row seat heater control unit 14P connector terminal No. 11: There should be continuity.	An open in the B-CAN wire
E32* 4	TAN		Check for continuity between terminal E32 and second row seat heater control unit 14P connector terminal No. 10: There should be continuity.	An open in the B-CAN wire
E31	PNK	Disconnect the power tailgate control unit connector C (14P)	Check for continuity between terminal E31 and power tailgate control unit connector C (14P) terminal No. 1: There should be continuity.	An open in the B-CAN wire
E32	TAN		Check for continuity between terminal E32 and power tailgate control unit connector C (14P) terminal No. 2: There should be continuity.	An open in the B-CAN wire
E31* 5	PNK	Disconnect the left side BSI radar unit 6P connector	Check for continuity between terminal E31 and left side BSI radar unit 6P connector terminal No. 3: There should be continuity.	An open in the B-CAN wire
E32* 5	TAN	Disconnect the left side BSI radar unit 6P connector	Check for continuity between terminal E32 and left side BSI radar unit 6P connector terminal No. 5: There should be continuity.	An open in the B-CAN wire

*1: With automatic wiper

*2: With ventilated seat

*3: Without ventilated seat

*4: With second row seat heater

*5: With BSI

*6: With MVCS

*7: With multipurpose camera unit

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
E31* 5	PNK	Disconnect the right side BSI radar unit 6P connector	Check for continuity between terminal E31 and right side BSI radar unit 6P connector terminal No. 3: There should be continuity.	An open in the B-CAN wire
E32* 5	TAN	Disconnect the right side BSI radar unit 6P connector	Check for continuity between terminal E32 and right side BSI radar unit 6P connector terminal No. 5: There should be continuity.	An open in the B-CAN wire
G1* 7	PNK	Disconnect the multipurpose camera unit 20P connector	Check for continuity between terminal G1 and multipurpose camera unit 20P connector terminal No. 6: There should be continuity.	An open in the B-CAN wire
G2* 7	BLU	Disconnect the multipurpose camera unit 20P connector	Check for continuity between terminal G2 and multipurpose camera unit 20P connector terminal No. 7: There should be continuity.	An open in the B-CAN wire
G13	LT BLU	Under all conditions	Check for continuity between terminal G13 and data link connector (DLC) terminal No. 7: There should be continuity.	An open in the K-LINE wire

*1: With automatic wiper

*2: With ventilated seat

*3: Without ventilated seat

*4: With second row seat heater

*5: With BSI

*6: With MVCS

*7: With multipurpose camera unit

5. Reconnect the connectors to 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, the MICU must be faulty; replace the driver's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
G16	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
E21	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
H7* 1	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D11 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
G9	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D11 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
E37	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D11 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire

*1: Without auto idle stop system

*2: With auto idle stop system

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
E19	GRY	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D10 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
G15	BLU	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D23 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
H13	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
E36	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
G8	RED	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D22 (15 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
K3	BLK	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D30 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
M8	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
K7	RED	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D18 (10 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
F31* 2	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D24 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
G6	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
H1	BLK	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	BRN	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

*1: Without auto idle stop system

*2: With auto idle stop system

Rear MICU

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

7. Disconnect rear fuse/relay box connectors.

Rear fuse/relay box connector A (49P) (female terminals):

Rear fuse/relay box connector B (36P) (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 the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
If the terminals look OK, go to step 9.

9. Reconnect the connectors to the rear 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 10.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B4	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 Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
B29	GRY	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D10 (15 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
B36	RED	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B3-3 (60 A) fuse in the main under-hood fuse box An open or high resistance in the wire
A6	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. F13 (7.5 A) fuse in the rear fuse/relay box An open or high resistance in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B20	YEL	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. F7 (20 A) fuse in the rear fuse/relay box An open or high resistance in the wire
B26	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G606) An open or high resistance in the ground wire
A29	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G606) An open or high resistance in the ground wire
B16	BLK/WHT	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G605) An open or high resistance in the ground wire
A1	BLK/WHT	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G605) An open or high resistance in the ground wire

10. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation and/or rear fuse/relay box (has a built-in MICU).

If input failures are related to a particular control unit, replace the control unit.