Reminder Systems (MICU and Gauge Control Module) Input Test

NOTE:

Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS) .
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. A26 , No. B1-6 , No. C29 , and No. D4 fuses are OK.

MICU

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

2. Disconnect under-dash fuse/relay box connectors.Under-dash fuse relay box connector D (44P) (female terminals):

Under-dash fuse relay box connector F (18P) (female terminals):

Under-dash fuse relay box connector M (12P) (female terminals):

Under-dash fuse relay box connector N (20P) (female terminals):

Under-dash fuse relay box connector P (24P) (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.

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 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
M9	WHT	Under all conditions	Measure the voltage to ground:There should be battery voltage.	Blown No. A26 fuse An open or high resistance in the wire
F2	WHT	Vehicle ON mode	Measure the voltage to ground:There should be battery voltage.	Blown No. B1-6 fuse Faulty IG1B relay An open or high resistance in the wire
D14	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
D42	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 (G401) An open or high resistance in the ground wire
D35	LT BLU	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
D35	LT BLU	Driver's door closed	Measure the voltage to ground:There should be about battery voltage.	Faulty driver's door switch A short to ground in the wire
D37	BLU	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
D37	BLU	Front passenger's door closed	Measure the voltage to ground:There should be about battery voltage.	Faulty front passenger's door switch A short to ground in the wire
D34	PNK	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
D34	PNK	Left rear door closed	Measure the voltage to ground:There should be about battery voltage.	Faulty left rear door switch A short to ground in the wire
D28	GRN	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
D28	GRN	Right rear door closed	Measure the voltage to ground:There should be about battery voltage.	Faulty right rear door switch A short to ground in the wire

*1: With power tailgate*2: Without power tailgate

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
D39	PNK	Power tailgate closer unit connector B (6P) disconnected* 1	Check for continuity between terminal D39 and power tailgate closer unit connector B (6P) terminal No. 1:There should be continuity.	An open or high resistance in the wire
		Tailgate open* 2	Measure the voltage to ground:There should be less than 0.2 V.	Faulty tailgate latch switch Poor ground (G604) or an open in the ground wire An open or high resistance in the wire
		Tailgate closed* 2	Measure the voltage to ground:There should be about battery voltage.	Faulty tailgate latch switch A short to ground in the wire
P22	PNK	Disconnect keyless access/TPMS control unit connector A (32P)	Check for continuity between terminal P22 and keyless access/TPMS control unit connector A (32P) terminal No. 2: There should be continuity.	An open or high resistance in the wire
N18N1	PNKBRN	Combination light switch OFF	Measure the voltage between terminals N18 and N1:There should be less than 0.2 V.	Faulty combination light switch An open or high resistance in the wire
N18N1	PNKBRN	Combination light switch in any position other than OFF	Measure the voltage between terminals N18 and N1:There should be about battery voltage.	Faulty combination light switch A short to ground in the wire
N20N1	WHTBRN	Combination light switch (PARKING position) ON	Measure the voltage between terminals N20 and N1:There should be less than 0.2 V.	Faulty combination light switch An open or high resistance in the wire
N20N1	WHTBRN	Combination light switch OFF	Measure the voltage between terminals N20 and N1:There should be about battery voltage.	Faulty combination light switch A short to ground in the wire
N19N1	BRNBRN	Combination light switch (headlight) ON	Measure the voltage between terminals N19 and N1:There should be less than 0.2 V.	Faulty combination light switch An open or high resistance in the wire
N19N1	BRNBRN	Combination light switch OFF	Measure the voltage between terminals N19 and N1:There should be about battery voltage.	Faulty combination light switch A short to ground in the wire

*1: With power tailgate

*2: Without power tailgate

Gauge Control Module

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

6. Disconnect the gauge control module connector A (32P).

Gauge Control Mndule Connector A (32P) (female terminals)

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 8.

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 9.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
A1	WHT	Under all conditions	Measure the voltage to ground:There should be battery voltage.	Blown No. A26 fuse An open or high resistance in the wire
A17	GRN	Vehicle ON mode	Measure the voltage to ground:There should be battery voltage.	Blown No. D1 fuse An open or high resistance in the wire
A4	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
A32	BRN	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

9. If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box - Refer to: Under-Dash Fuse/Relay Box Removal and Installation (2019) or Under-Dash Fuse/Relay Box Removal and Installation (includes the MICU). If input failures are related to a particular control unit, replace the gauge control module .