Control Unit Input Test

Before testing, troubleshoot the multiplex control system (see TROUBLESHOOTING ).
Remove the dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
Disconnect the under-dash fuse/relay box connectors B, F, G, J, X and Y.
NOTE: All connectors are shown from wire side of female terminals.

Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors
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 are OK, go to step 5.

Reconnect the connectors, and make these input tests at the connector.

If any test indicates a problem, find and correct the cause, then recheck the system.

If all the input tests prove OK, the multiplex control unit must be faulty; replace the under-dash fuse/relay box assembly.

TEST CONDITION TABLE

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
J4	BLK	Under all conditions	Measure voltage to ground: There should be less than 0.5 V.	Poor ground(G401) An open in the wire
Y6	BLK	Under all conditions	Measure voltage to ground: There should be less than 0.5 V.	Poor ground(G502) An open in the wire
B1	WHT/GRN	Ignition switch ON (II) and washer switch ON	Measure voltage to ground: There should be battery voltage.	Blown No. 20 (20 A) fuse in the under-dash fuse/relay box Faulty wiper/washer switch An open in the wire
X7	BLU/BLK	Ignition switch ON (II) and wiper switch in INT	Measure voltage to ground: There should be battery voltage.
B6	BLU/RED	Ignition switch ON (II), wiper switch in OFF or INT, and when the motor is not in operation.	Measure voltage to ground: There should be battery voltage.	Blown No. 20 (20 A) fuse in the under-dash fuse/relay box Faulty wiper/washer switch Faulty windshield wiper motor An open in the wire
G7	BLU/WHT	Ignition switch ON (II) and wipers in park position	Measure voltage to ground: There should be battery voltage.	Blown No. 20 (20 A) fuse in the under-dash fuse/relay box Faulty windshield wiper motor An open in the wire
B1 F6	WHT/GRN	Jump B1 to F6 terminals, then ignition switch ON (II) and washer switch ON	Check windshield washer motor operation: The washer motor should run.	Poor ground(G201) Blown No. 20 (20 A) fuse in the under-dash fuse/relay box Faulty wiper/washer switch Faulty windshield washer motor Faulty under-dash fuse/relay box An open in the wire