Turn the ignition switch to LOCK (0), and remove the under-hood fuse/relay box under cover (see REMOVAL AND INSTALLATION ).
Disconnect under-hood fuse/relay box connector J (10P).

Fig 1: Identifying Under-Hood Fuseirelay Box Connector J (10P)
Courtesy of AMERICAN HONDA MOTOR CO., 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 look OK, go to step 4.

Reconnect the connector to the under-hood 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.

DTC TEST REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
J10	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G301) An open or high resistance in the ground wire
J8	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire

Disconnect under-hood fuse/relay box connector J (10P), 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, the relay control module must be faulty, replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

DTC TEST REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
J7	LT GRN	Under all conditions	Check for continuity between terminal J7 and driver's under-dash fuse/relay box connector D (17P) terminal No. 11: There should be continuity.	An open or high resistance in the wire
		Under all conditions (Driver's under-dash fuse/relay box connector D(17P) disconnected)	Check for continuity to ground: There should be no continuity.	A short to ground in the wire

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Relay Control Module Input Test