Safety Indicator System (MICU, Rear MICU, and Gauge Control Module) Input Test (2017 2018 2019 2020)

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 A - Initial Communication and DTC Checks (2017 2018 2019 2020)
Before testing, do the gauge control module self-diagnostic function - Refer to: Gauges Self-Diagnostic Function (2017 2018 2019 2020) to make sure the beeper and the indicators in the gauge control module work properly and the F-CAN lines are OK.
Before testing, make sure the No. C16 (10 A) fuse in the under-hood fuse/relay box is OK.
Without auto idle stop system: Before testing, make sure the No. D11 (7.5 A) fuse in the driver's under-dash fuse/relay box is OK.
With auto idle stop system: Before testing, make sure the No. D24 (7.5 A) fuse in the driver's under-dash fuse/relay box, and No. H7 (10 A) fuse in the auxiliary driver's under-dash fuse/relay box are OK.

MICU

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

2. Disconnect driver's under-dash fuse/relay box connectors.

Driver's under-dash fuse/relay box connector E (44P) (female terminals): Driver's under-dash fuse/relay box connector G (16P) (female terminals): Driver's under-dash fuse/relay box connector H (13P) (female terminals): Driver's under-dash fuse/relay box connector P (24P) (female terminals): Driver's under-dash fuse/relay box connector Q (20P) (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 driver's 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 results not obtained
G6	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G506) 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 (G502) An open or high resistance in the ground wire
P2	BRN	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
Q4	PNK	Disconnect keyless access/TPMS control unit connector A (32P)	Check for continuity between terminal Q4 and keyless access/TPMS control unit connector A (32P) terminal No. 2: There should be continuity.	An open or high resistance in the wire
E24	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
E24	LT BLU	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
E25	LT 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
E25	LT 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

Rear MICU

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

6. Disconnect rear fuse/relay box connectors.

Rear fuse/relay box connector A (49P) (female terminals): Rear fuse/relay box connector B (36P) (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 look OK, go to step 8.

8. 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 9.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A1	BLK/WHT	In all power modes	Check for continuity to ground: There should be continuity.	Poor ground (G605) An open or high resistance in the ground wire
B16	BLK	In all power modes	Check for continuity to ground: There should be continuity.	Poor ground (G605) An open or high resistance in the ground wire
B26	BLK/WHT	In all power modes	Check for continuity to ground: There should be continuity.	Poor ground (G606) An open or high resistance in the ground wire
A29	BLK	In all power modes	Check for continuity to ground: There should be continuity.	Poor ground (G606) An open or high resistance in the ground wire
B12	GRN	Left rear door open	Check for continuity to ground: There should be continuity.	Faulty left rear door switch Faulty left rear door switch ground An open or high resistance in the wire
B12	GRN	Left rear door closed	Check for continuity to ground: There should be no continuity.	Faulty left rear door switch A short to ground in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B11	PNK/WHT	Right rear door open	Check for continuity to ground: There should be continuity.	Faulty right rear door switch Faulty right rear door switch ground An open or high resistance in the wire
B11	PNK/WHT	Right rear door closed	Check for continuity to ground: There should be no continuity.	Faulty right rear door switch A short to ground in the wire
A9	GRN	Power tailgate closer unit connector B (6P) disconnected	Check for continuity between terminal A9 and power tailgate closer unit connector B (6P) terminal No. 5: There should be continuity.	An open or high resistance in the wire

Gauge Control Module

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

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

Gauge control module connector A (32P) (female terminals)

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

11. 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 12.

12. 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 13.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
A1	GRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C16 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
A2* 1	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D11 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire

*1: Without auto idle stop system*2: With auto idle stop system

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired results not obtained
A2* 2	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D24 (7.5 A) fuse in the driver's under-dash fuse/relay box Blown No. H7 (10 A) fuse in the auxiliary driver's under-dash fuse/relay box Faulty DC-DC converter Faulty DC-DC converter IG1 relay1 An open or high resistance in the wire
A16	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

*1: Without auto idle stop system

*2: With auto idle stop system

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