MICU Input Test (2012 - 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 the indicated DTCs first.

1. Turn the ignition switch to LOCK (0).

2. Disconnect under-dash fuse/relay box connectors A, B, D, K, M, Q, and W - Refer to: Under-Dash Fuse/Relay Box Removal and Installation (KA models with Keyless Access System), or Under-Dash Fuse/Relay Box Removal and Installation (KA KX models without Keyless Access System) .

NOTE: All connector views are shown from wire side of female terminals.

Courtesy of HONDA, U.S.A., INC.

3. 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 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
K1	BLU	Disconnect the climate control unit 32P connector	Check for continuity between terminal K1 and climate control unit 32P connector terminal No. 27: There should be continuity.	An open in the B-CAN wire
K2	PNK		Check for continuity between terminal K2 and climate control unit 32P connector terminal No. 26: There should be continuity.	An open in the B-CAN wire
K1	BLU	Disconnect the immobilizer-keyless control unit 7P connector	Check for continuity between terminal K1 and immobilizer-keyless control unit 7P connector terminal No. 5: There should be continuity.	An open in the B-CAN wire
K2	PNK		Check for continuity between terminal K2 and immobilizer-keyless control unit 7P connector terminal No. 4: There should be continuity.	An open in the B-CAN wire
M1	BLU	Disconnect audio unit connector B (20P)	Check for continuity between terminal M1 and audio unit connector B (20P) terminal No. 3: There should be continuity.	An open in the B-CAN wire
M2	PNK		Check for continuity between terminal M2 and audio unit connector B (20P) terminal No. 13: There should be continuity.	An open in the B-CAN wire
M1	BLU	Disconnect the automatic lighting control unit 14P connector	Check for continuity between terminal M1 and automatic lighting control unit 14P connector terminal No. 4: There should be continuity.	An open in the B-CAN wire
M2	PNK		Check for continuity between terminal M2 and automatic lighting control unit 14P connector terminal No. 3: There should be continuity.	An open in the B-CAN wire
K1	BLU	Disconnect the gauge control module (tach) 32P connector	Check for continuity between terminal K1 and gauge control module (tach) 32P connector terminal No. 31: There should be continuity.	An open in the B-CAN wire
K2	PNK		Check for continuity between terminal K2 and gauge control module (tach) 32P connector terminal No. 30: There should be continuity.	An open in the B-CAN wire
Q6	BLU	Disconnect multi-information display unit connector A (32P)	Check for continuity between terminal Q6 and multi-information display unit connector A (32P) terminal No. 15: There should be continuity.	An open in the B-CAN wire
Q5	PNK		Check for continuity between terminal Q5 and multi-information display unit connector A (32P) terminal No. 31: There should be continuity.	An open in the B-CAN wire
Q14	LT BLU	Under all conditions	Check for continuity between terminal Q14 and data link connector (DLC) terminal No. 7: There should be continuity.	An open in the K-LINE wire

5. Reconnect the connectors to the 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, the MICU must be faulty; replace the under-dash fuse/relay box - Refer to: Under-Dash Fuse/Relay Box Removal and Installation (KA models with Keyless Access System), or Under-Dash Fuse/Relay Box Removal and Installation (KA KX models without Keyless Access System) .
NOTE: These are power and ground tests for the MICU.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A3	BLU	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
D28	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
W6	BLK	In all ignition switch positions	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
B32	BLK	Under all conditions	Measure the voltage to ground: There should be less than 0. 2 V.	Poor ground (G602) An open or high resistance in the ground wire