Gauge Control Module Input Test (2015 2017)

NOTE:

Before testing, do the gauge control module self-diagnostic function , 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 .
Before testing, make sure the No. A21 (10 A) fuse in the under-hood fuse/relay box is OK.
Before testing, make sure the No. B5 (10 A) fuse in the under-dash fuse/relay box is OK.

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

2. Disconnect the gauge control module connectors

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 the terminals are OK, go to step 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A15	TAN	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
A16	RED	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
A24	BLU	Turn the vehicle to the 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
A25	GRN	Turn the vehicle to the 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

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 result is not obtained
A1	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A21 (10 A) fuse in the under-hood fuse/relay box Faulty under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
A17	BRN	Turn the vehicle to the ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. B5 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
A32	BRN	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
A4	BRN	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
A11	GRN	Turn the vehicle to the 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
A11	GRN	Turn the vehicle to the 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 (G301) or an open in the ground wire An open or high resistance in the wire
A5 *	BLU	Turn the vehicle to the 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
A5 *	BLU	Turn the vehicle to the 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 (G201) or an open in the ground wire An open or high resistance in the wire
A10	LT GRN	Turn the vehicle to the ON mode, parking brake lever pulled	Measure the voltage to ground: There should be less than 0.2 V.	Faulty parking brake switch Faulty parking brake switch ground An open or high resistance in the wire
A10	LT GRN	Turn the vehicle to the ON mode, parking brake lever released	Measure the voltage to ground: There should be about 5 V.	Faulty parking brake switch A short to ground in the wire

*: Canada model

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A8	WHT	Turn the vehicle to the ON mode, ECON switch pushed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty ECON switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
A8	WHT	Turn the vehicle to the ON mode, ECON switch released	Measure the voltage to ground: There should be about 5 V.	Faulty ECON switch A short to ground in the wire
B3	YEL	Turn the vehicle to the ON mode, EV switch pushed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty EV switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
B3	YEL	Turn the vehicle to the ON mode, EV switch released	Measure the voltage to ground: There should be about 5 V.	Faulty EV switch A short to ground in the wire

*: Canada model