Control Unit Input Test

NOTE:

Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
Before testing, make sure the No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box is OK.

Driver's MICU

Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ).
Disconnect driver's under-dash fuse/relay box connectors D, Q, and R.
NOTE: All connector views are wire side of female terminals.

Fig 1: Identifying Driver'S Under-Dash Fuse/Relay Box Connector Terminals
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.

With the connectors still disconnected, do the following input test:

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.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
D5	PUR	Power tailgate closer unit connector B (6P) disconnected	Check for continuity between terminal D5 and power tailgate closer unit connector B (6P) terminal No. 2: There should be continuity.	An open or high resistance in the wire

Reconnect the connectors to the driver's under-dash fuse/relay box, and do the following input tests.

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

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 8.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
Q1	BRN	In all ignition switch positions or all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
Q2	BLK	In all ignition switch positions or all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground(G402) An open or high resistance in the ground wire
R2	BLK	In all ignition switch positions or all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G402) An open or high resistance in the ground wire
R5	ORN	In all ignition switch positions or all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground(G401) An open or high resistance in the ground wire
D4	LT GRN	Left rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty left rear door switch Faulty left rear door switch ground An open or high resistance in the wire
D4	LT GRN	Left rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty left rear door switch A short to ground in the wire
D12	GRN	Driver's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door switch Faulty driver's door switch ground An open or high resistance in the wire
D12	GRN	Driver's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door switch A short to ground in the wire

Passenger's MICU

Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Remove the passenger's kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
Disconnect passenger's under-dash fuse/relay box connectors A and H.
NOTE: All connector views are wire side of female terminals.

Fig 2: Identifying Passenger'S Under-Dash Fuse/Relay Box Connector Terminals
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 12.

Reconnect the connectors to the passenger's under-dash 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 14.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A14	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 15 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
A35	BRN	Ignition switch ON (II), or power mode ON	Measure the voltage to ground: There should be battery voltage.	Blown No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
H3	LT BLU	Front passenger's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door switch Faulty front passenger's door switch ground An open or high resistance in the wire
H3	LT BLU	Front passenger's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty front passenger's door switch A short to ground in the wire
H25	ORN	Right rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty right rear door switch Faulty right rear door switch ground An open or high resistance in the wire
H25	ORN	Right rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty right rear door switch A short to ground in the wire

Gauge Control Module

Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ), and disconnect connector A (32P) from it.

Fig 3: Identifying Gauge Control Module Connector A (32P)
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 16.

Reconnect connector A (32P) to the gauge control module, 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 17.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A16	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 15 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
A15	BRN	Ignition switch ON (II), or power mode ON	Measure the voltage to ground: There should be battery voltage.	Blown No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
A1	GRY	In all ignition switch positions or all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G402) An open or high resistance in the ground wire

If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the driver's MICU) (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION ). If input failures are related to a particular control unit, replace the gauge control unit (see GAUGE CONTROL MODULE REPLACEMENT ).