MICU Input Test (2013)

WARNING: This page is about a different variant/trim than selected.

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.

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF 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 below.

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 below.

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*¹	BLU	Disconnect climate control unit 32P connector	Check for continuity between terminal R9 and climate control unit 32P connector terminal No. 30: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10*¹	PNK	Disconnect climate control unit 32P connector	Check for continuity between terminal R10 and climate control unit 32P connector 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*²	BLU	Disconnect the automatic lighting control unit/sensor 7P connector	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*²	PNK		Check for continuity between terminal R10 and automatic lighting control unit/sensor 7P connector terminal No. 6: There should be continuity.
R9*³	BLU	Disconnect audio unit connector A (24P)	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*³	PNK	Disconnect audio unit connector A (24P)	Check for continuity between terminal R10 and audio unit connector A (24P) terminal No. 4: There should be continuity.
R9*⁴	BLU	Disconnect the power seat control unit connector B (20P)	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*⁴	PNK	Disconnect the power seat control unit connector B (20P)	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 immobilizer control unit 7P connector	Check for continuity between terminal R9 and immobilizer control unit 7P connector terminal No. 5: There should be continuity.	An open or high resistance in the B-CAN wire Faulty center junction box
R10	PNK	Disconnect the immobilizer control unit 7P connector	Check for continuity between terminal R10 and immobilizer control unit 7P connector terminal No. 4: 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: With climate control

*2: With automatic lighting

*3: With audio

*4: With DPMS

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 ignition switch positions or 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 ignition switch positions or 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 ignition switch positions or 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 ignition switch positions or 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