MICU Input Test

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
Before testing, make sure the No. B21 (15 A) and No. B29 (10 A) fuses 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, G, H, N, 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 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
G2	PNK	Disconnect the gauge control module 32P connector	Check for continuity between terminal G2 and gauge control module 32P connector terminal No. 23: There should be continuity.	An open in the B-CAN wire
G3	BLU	Disconnect the gauge control module 32P connector	Check for continuity between terminal G3 and gauge control module 32P connector terminal No. 24: There should be continuity.	An open in the B-CAN wire
G2	PNK	Disconnect the climate control unit 32P connector	Check for continuity between terminal G2 and climate control unit 32P connector terminal No. 6: There should be continuity.	An open in the B-CAN wire
G3	BLU	Disconnect the climate control unit 32P connector	Check for continuity between terminal G3 and climate control unit 32P connector terminal No. 7: There should be continuity.	An open in the B-CAN wire
G2	PNK	Disconnect the automatic lighting control unit/sensor 7P connector	Check for continuity between terminal G2 and automatic lighting control unit/sensor 7P connector terminal No. 6: There should be continuity.	An open in the B-CAN wire
G3	BLU		Check for continuity between terminal G3 and automatic lighting control unit/sensor 7P connector terminal No. 7: There should be continuity.	An open in the B-CAN wire
G2^*1	PNK	Disconnect the immobilizer-keyless control unit 7P connector	Check for continuity between terminal G2 and immobilizer-keyless control unit 7P connector terminal No. 4: There should be continuity.	An open in the B-CAN wire
G3^*1	BLU		Check for continuity between terminal G3 and immobilizer-keyless control unit 7P connector terminal No. 5: There should be continuity.	An open in the B-CAN wire
G2^*2	PNK	Disconnect keyless access control unit connector C (20P)	Check for continuity between terminal G2 and keyless access control unit connector C (20P) terminal No. 1: There should be continuity.	An open in the B-CAN wire
G3^*2	BLU	Disconnect keyless access control unit connector C (20P)	Check for continuity between terminal G3 and keyless access control unit connector C (20P) terminal No. 11: There should be continuity.	An open in the B-CAN wire
G2^*3	PNK	Disconnect audio unit connector B (20P)	Check for continuity between terminal G2 and audio unit connector B (20P) terminal No. 13: There should be continuity.	An open in the B-CAN wire
G3^*3	BLU	Disconnect audio unit connector B (20P)	Check for continuity between terminal G3 and audio unit connector B (20P) terminal No. 3: There should be continuity.	An open in the B-CAN wire
G2^*4	PNK	Disconnect audio unit connector C (24P)	Check for continuity between terminal G2 and audio unit connector C (24P) terminal No. 24: There should be continuity.	An open in the B-CAN wire
G3^*4	BLU	Disconnect audio unit connector C (24P)	Check for continuity between terminal G3 and audio unit connector C (24P) terminal No. 12: There should be continuity.	An open in the B-CAN wire
G2^*5	PNK	Disconnect audio-navigation unit connector B (20P)	Check for continuity between terminal G2 and audio-navigation unit connector B (20P) terminal No. 13: There should be continuity.	An open in the B-CAN wire
G3^*5	BLU	Disconnect audio-navigation unit connector B (20P)	Check for continuity between terminal G3 and audio-navigation unit connector B (20P) terminal No. 3: There should be continuity.	An open in the B-CAN wire
D13	LT BLU	Under all conditions	Check for continuity between terminal D13 and data link connector (DLC) terminal No. 7: There should be continuity.	An open in the K LINE wire

*1: Without keyless access system

*2: With keyless access system

*3: With display audio

*4: With color audio

*5: With navigation

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
Q15	RED	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B29 (10 A) fuse in the under-hood fuse/relay box Faulty under-hood fuse/relay box An open or high resistance in the wire
D23	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
H1	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
N6	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
N38	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