Safety Indicator System (MICU and Gauge Control Module) Input Test

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
Before testing, do the gauge control module self-diagnostic function to make sure the beeper and the indicators in the gauge control module work properly and the F-CAN line are OK.
Before testing, make sure the No. B21 (10 A) fuse in the under-hood fuse/relay box are OK.
Before testing, make sure the No. C34 (7.5 A) fuse in the under-dash fuse/relay box is OK.

MICU

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

2. Disconnect under-dash fuse/relay box connectors D, 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.

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.

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
N23	BRN	Driver's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door switch Faulty driver's door switch ground An open or high resistance in the wire
N23	BRN	Driver's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door switch A short to ground in the wire
N34	GRN	Front passenger's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door switch Faulty front passenger's door switch ground An open or high resistance in the wire
N34	GRN	Front passenger's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty front passenger's door switch A short to ground in the wire
N39	GRY	Left rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty left rear door switch Faulty left rear door switch ground An open or high resistance in the wire
N39	GRY	Left rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty left rear door switch A short to ground in the wire
N37	WHT	Right rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty right rear door switch Faulty right rear door switch ground An open or high resistance in the wire
N37	WHT	Right rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty right rear door switch A short to ground in the wire
N26	PNK	Tailgate open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty tailgate latch switch Poor ground (G504) or an open in the ground wire An open or high resistance in the wire
N26	PNK	Tailgate closed	Measure the voltage to ground: There should be about 5 V.	Faulty tailgate latch switch A short to ground in the wire

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, go to step 6.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
Q15	RED	In all power modes	Measure the voltage to ground: There should be battery voltage.	Blown No. B21 (10 A) fuse in the 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 (G502) 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 (G502) An open or high resistance in the ground wire

Gauge Control Module

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

7. Disconnect the gauge control module 32P connector

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

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 9.

Reconnect the connector, 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
16	RED	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B21 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
15	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C34 (7.5 A) fuse in the under-dash 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
17	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

10. If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU). If input failures are related to a particular control unit, replace the gauge control module .