MICU Input Test

NOTE:

Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.
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 .
Before testing, make sure the No. A21 (10 A) fuse in the under-hood fuse/relay box is OK.

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

2. Disconnect under-dash fuse/relay box connectors D, E, P, and R

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 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
R9	BLU	Disconnect the gauge control module connector A (32P)	Check for continuity between terminal R9 and gauge control module connector A (32P) terminal No. 31: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box Faulty driver's junction box
R10	PNK	Disconnect the gauge control module connector A (32P)	Check for continuity between terminal R10 and gauge control module connector A (32P) terminal No. 30: There should be continuity.
R9	BLU	Disconnect climate control unit connector A (32P)	Check for continuity between terminal R9 and climate control unit connector A (32P) terminal No. 30: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect climate control unit connector A (32P)	Check for continuity between terminal R10 and climate control unit connector A (32P) terminal No. 32: There should be continuity.
R9	BLU	Disconnect the power window master switch 37P connector	Check for continuity between terminal R9 and power window master switch 37P connector terminal No. 30: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect the power window master switch 37P connector	Check for continuity between terminal R10 and power window master switch 37P connector terminal No. 28: There should be continuity.
R9	BLU	Disconnect the automatic lighting control unit/sensor 7P connector *1	Check for continuity between terminal R9 and automatic lighting control unit/sensor 7P connector terminal No. 7: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box Faulty driver's junction box
R10	PNK		Check for continuity between terminal R10 and automatic lighting control unit/sensor 7P connector terminal No. 6: There should be continuity.
R9	BLU	Disconnect the automatic lighting/rain sensor 5P connector *2	Check for continuity between terminal R9 and automatic lighting/rain sensor 5P connector terminal No. 3 There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box Faulty driver's junction box
R10	PNK		Check for continuity between terminal R10 and automatic lighting/rain sensor 5P connector terminal No. 4: There should be continuity.
R9	BLU	Disconnect the auto high-beam control unit 6P connector *3	Check for continuity between terminal R9 and auto high-beam control unit 6P connector terminal No. 3: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box Faulty driver's junction box
R10	PNK	Disconnect the auto high-beam control unit 6P connector *3	Check for continuity between terminal R10 and auto high-beam control unit 6P connector terminal No. 2: There should be continuity.
R9	BLU	Disconnect the parking and back-up sensor control unit 24P connector *4	Check for continuity between terminal R9 and parking and back-up sensor control unit 24P connector terminal No. 10: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box Faulty driver's junction box
R10	PNK		Check for continuity between terminal R10 and parking and back-up sensor control unit 24P connector terminal No. 22: There should be continuity.
R9	BLU	Disconnect the wireless charger 7P connector *5	Check for continuity between terminal R9 and wireless charger 7P connector terminal No. 2: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect the wireless charger 7P connector *5	Check for continuity between terminal R10 and wireless charger 7P connector terminal No. 3: There should be continuity.
R9	BLU	Disconnect the power seat control unit connector B (20P) *6	Check for continuity between terminal R9 and power seat control unit connector B (20P) terminal No. 17: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box Faulty driver's junction box
R10	PNK	Disconnect the power seat control unit connector B (20P) *6	Check for continuity between terminal R10 and power seat control unit connector B (20P) terminal No. 16: There should be continuity.
R9	BLU	Disconnect the keyless access control unit connector B (28P)	Check for continuity between terminal R9 and keyless access control unit connector B (28P) terminal No. 7: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box Faulty driver's junction box
R10	PNK		Check for continuity between terminal R10 and keyless access control unit connector B (28P) terminal No. 6: There should be continuity.
R9	BLU	Disconnect audio unit connector A (24P) *7	Check for continuity between terminal R9 and audio unit connector A (24P) terminal No. 2: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect audio unit connector A (24P) *7	Check for continuity between terminal R10 and audio unit connector A (24P) terminal No. 4: There should be continuity.
R9	BLU	Disconnect audio-navigation unit connector A (24P) *8	Check for continuity between terminal R9 and audio-navigation unit connector A (24P) terminal No. 2: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect audio-navigation unit connector A (24P) *8	Check for continuity between terminal R10 and audio-navigation unit connector A (24P) terminal No. 4: There should be continuity.
R9	BLU	Disconnect audio unit connector A (24P) *9	Check for continuity between terminal R9 and audio unit connector A (24P) terminal No. 2: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect audio unit connector A (24P) *9	Check for continuity between terminal R10 and audio unit connector A (24P) terminal No. 4: There should be continuity.
R9	BLU	Disconnect audio unit connector B (20P) *10	Check for continuity between terminal R9 and audio unit connector B (20P) terminal No. 3: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect audio unit connector B (20P) *10	Check for continuity between terminal R10 and audio unit connector B (20P) terminal No. 13: There should be continuity.
R9	BLU	Disconnect audio-navigation unit connector B (20P) *11	Check for continuity between terminal R9 and audio-navigation unit connector B (20P) terminal No. 3: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect audio-navigation unit connector B (20P) *11	Check for continuity between terminal R10 and audio-navigation unit connector B (20P) terminal No. 13: There should be continuity.
R12	LT BLU	Under all conditions	Check for continuity between terminal R12 and data link connector (DLC) terminal No. 7: There should be continuity.	An open or high resistance in the K LINE wire Faulty center junction box

*1: Without automatic wiper

*2: With automatic wiper

*3: With auto high-beam system

*4: With parking and back-up sensor

*5: With wireless charger

*6: With DPMS

*7:'14-15Without navigation

*8:'14-15With navigation

*9:'17Without display audio

*10:'17Without navigation with display audio

*11:'17With navigation system

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
E23	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A21 (10 A) fuse in the under-hood fuse/relay box Faulty 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 (G401) 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 (G601) 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 (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 (G501) An open or high resistance in the ground wire

*:'14-15