Gauge Control Module Input Test (2017 2018 2019 2020)

NOTE: 

• Before testing, do the gauge control module self-diagnostic function - Refer to: Gauges Self-Diagnostic Function (2017 2018 2019 2020), , and make sure the B-CAN communication lines are OK.
• If you are troubleshooting multiple DTCs, be sure to follow the instructions in 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, 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 the No. H7 (10 A) fuse in the auxiliary under-dash fuse/relay box are OK.

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

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

Gauge control module connector A (32P) (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 connector 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 results not obtained
A13	RED	Combination light switch ON	Connect to ground with a jumper wire: The dashlights should come on full bright.	Faulty LEDs An open or high resistance in the wire
A14	YEL	Combination light switch ON	Connect to ground with a jumper wire: The dashlights should come on full bright.	Faulty bulbs An open or high resistance in the wire
A18	BLU	Vehicle ON mode, turn signal switch to LEFT	Measure the voltage to ground: There should be battery voltage when the lights are flashing.	Faulty MICU Faulty combination light switch An open or high resistance in the wire
A17	WHT	Vehicle ON mode, turn signal switch to RIGHT	Measure the voltage to ground: There should be battery voltage when the lights are flashing.	Faulty MICU Faulty combination light switch An open or high resistance in the wire
A12	YEL	Parking brake pedal pressed	Check for continuity to ground: There should be continuity.	Faulty parking brake switch An open or high resistance in the wire
		Parking brake pedal released	Check for continuity to ground: There should be no continuity.	Faulty parking brake switch A short to ground in the wire

5. 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, replace the gauge control module .

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
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 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
A32	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G507) An open or high resistance in the ground wire
A11	TAN	Vehicle ON mode, brake fluid is at full level in the reservoir	Measure the voltage to ground: There should be about 5 V.	Faulty brake fluid level switch A short to ground in the wire
		Vehicle ON mode, brake fluid is at lower level in the reservoir	Measure the voltage to ground: There should be less than 0.2 V.	Faulty brake fluid level switch Poor ground (G402) or an open in the ground wire An open or high resistance in the wire
A19	GRY	Vehicle ON mode, dashlights brightness control ILLUMI (+) button pushed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty dashlights brightness control switch Poor ground (G507) or an open in the ground wire An open or high resistance in the wire
		Vehicle ON mode, dashlights brightness control ILLUMI (+) button released	Measure the voltage to ground: There should be about 5 V.	Faulty dashlights brightness control switch A short to ground in the wire
A20	LT BLU	Vehicle ON mode, dashlights brightness control ILLUMI (-) button pushed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty dashlights brightness control switch Poor ground (G507) or an open in the ground wire An open or high resistance in the wire
		Vehicle ON mode, dashlights brightness control ILLUMI (-) button released	Measure the voltage to ground: There should be about 5 V.	Faulty dashlights brightness control switch A short to ground in the wire
A22* 2	TAN	Vehicle ON mode, idle stop OFF switch pushed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty idle stop OFF switch Poor ground (G507) or an open in the ground wire An open or high resistance in the wire
		Vehicle ON mode, idle stop OFF switch released	Measure the voltage to ground: There should be about 5 V.	Faulty idle stop OFF switch A short to ground in the wire
A23	BLU	Vehicle ON mode, integrated dynamics system switch pushed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty integrated dynamics system switch Poor ground (G507) or an open in the ground wire An open or high resistance in the wire
		Vehicle ON mode, integrated dynamics system switch released	Measure the voltage to ground: There should be about 5 V.	Faulty integrated dynamics system switch A short to ground in the wire
A10	GRY	Vehicle ON mode, washer fluid is half or more in the washer reservoir	Measure the voltage to ground: There should be about 5 V.	Faulty washer fluid level switch A short to ground in the wire
		Vehicle ON mode, washer fluid is empty in the washer reservoir	Measure the voltage to ground: There should be less than 0.2 V.	Faulty washer fluid level switch Poor ground (G204) or an open in the ground wire An open or high resistance in the wire

*1: Without auto idle stop system

*2: With auto idle stop system