Reminder Systems (MICU and Gauge Control Module) Input Test (2020 2021 2022 2023)

NOTE:

Before testing, troubleshoot the multiplex integrated control unit first, using 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 fuses and relays associated with the system 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 E (36P) (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.

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.

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 result is not obtained
M9	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
F2	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
E32	BRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	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
P19	PNK	In-bed trunk lid open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty in-bed trunk lid latch switch Poor ground (G701) or an open in the ground wire An open or high resistance in the wire
P19	PNK	In-bed trunk lid closed	Measure the voltage to ground: There should be about battery voltage.	Faulty in-bed trunk lid latch switch A short to ground in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
P22	LT BLU	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
N18*N1	PNK*BRN	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
N18*N1	PNK*BRN	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
N20*N1	WHT*BRN	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
N20*N1	WHT*BRN	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
N19*N1	BRN*BRN	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
N19*N1	BRN*BRN	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

Gauge Control Module

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

6. Disconnect the gauge control module 32P connector.

GAUGE CONTROL MODULE 32P CONNECTOR (female terminals)

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

7. 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.

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 result is not obtained
1	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
17	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
4	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
32	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 (includes the MICU). If input failures are related to a particular control unit, replace the gauge control module .