Multiplex Integrated Control Unit

Turn the ignition switch OFF.
Remove the left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
Disconnect the driver's under-dash fuse/relay box connectors E and H (see DRIVER'S UNDER-DASH FUSE/RELAY BOX ).

Fig 1: Identifying Driver's 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 look OK, go to step 5.

Reconnect the connectors to the driver's under-dash fuse/relay box. Turn the ignition switch ON (II) and make the input tests shown in CONTROL UNIT INPUT TEST DESCRIPTION , at the appropriate connectors on the driver's under-dash fuse/relay box.

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 6.

CONTROL UNIT INPUT TEST DESCRIPTION

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
E15	GRN	Driver's door open	Check for voltage to ground: There should be less then 1 V.	Faulty driver's door switch An open in the wire
E15	GRN	Driver's door closed	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door switch Short to ground
H12	LT GRN/RED	Front passenger's door open	Check for voltage to ground: There should be less than 1 V.	Faulty front passenger's door switch An open in the wire
H12	LT GRN/RED	Front passenger's door closed	Check for voltage to ground: There should be 5 V or more.	Faulty front passenger's door switch Short to ground
E14	GRN/YEL	Left rear door open	Check for voltage to ground: There should be less than 1 V.	Faulty left rear door switch An open in the wire
E14	GRN/YEL	Left rear door closed	Check for voltage to ground: There should be 5 V or more.	Faulty left rear door switch Short to ground
H13	GRN/WHT	Right rear door open	Check for voltage to ground: There should be less than 1 V.	Faulty right rear door switch An open in the wire
H13	GRN/WHT	Right rear door closed	Check for voltage to ground: There should be 5 V or more.	Faulty right rear door switch Short to ground

Gauge Control Module

Turn the ignition switch OFF.
Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).
Disconnect the gauge control module connector A (30P).

Fig 2: Identifying Gauge Control Module Connector A (30P)
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 10.

Reconnect the connector to the gauge control module, turn the ignition switch ON (II) and, make the input tests shown in CONTROL UNIT INPUT TEST DESCRIPTION , 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, go to step 11.

CONTROL UNIT INPUT TEST DESCRIPTION

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
A5	YEL	Ignition switch ON (II)	Check for voltage to ground: There should be battery voltage.	Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire
A6	WHT/RED	Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire
A21	BLK	Under all conditions	Check for voltage to ground: There should be less than 1 V.	Poor ground (G502) An open in the wire

MICU-Rear Junction Box

Remove the right rear side trim (see TRIM REMOVAL/INSTALLATION - REAR SIDE AREA ).
Disconnect the MICU-rear junction box connector F (13P).

Fig 3: Identifying MICU-Rear Junction Box Connector F (13P)
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 14.

Reconnect the connector to the MICU-rear junction box. Turn the ignition switch ON (II) and make the input tests shown in CONTROL UNIT INPUT TEST DESCRIPTION , at the appropriate connectors on the MICU-rear junction box.

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 15.

CONTROL UNIT INPUT TEST DESCRIPTION

Cavity

Wire

Test condition

Test: Desired result

Possible cause if result is not obtained

F3 ⁽¹⁾

LT GRN/BLK

Tailgate open

Check for voltage to ground:
There should be less than 1 V.

Faulty tailgate closer unit
An open in the wire

Tailgate closed

Check for voltage to ground:
There should be 5 V or more.

Faulty tailgate closer unit
Short to ground

F3 ⁽²⁾

GRN/BLK

Tailgate open

Check for voltage to ground:
There should be less than 1 V.

Poor ground (G701)
Faulty tailgate latch switch
An open in the wire

Tailgate closed

Check for voltage to ground:
There should be 5 V or more.

Faulty tailgate latch switch
Short to ground

⁽¹⁾	With power tailgate

⁽²⁾	Without power tailgate

If all the input tests prove OK, and no DTCs were found during multiplex integrated control system troubleshooting (B-CAN System Diagnostic Test Mode A), go to the B-CAN system input and output index (see B-CAN SYSTEM UNIT INPUT/OUTPUT INDEX ). If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the MICU). If input failures are related to particular control unit, replace the control unit.