Control Unit Input Test: MICU

Turn the ignition switch OFF.
Remove the left front door sill trim and left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
Disconnect the under-dash fuse/relay box connectors.
NOTE: All connector views are wire side of female terminals.

Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors And Terminals Numbers
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, make these input tests at the connectors.

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

If the input tests prove OK, go to step 6.

PROBLEM SYMPTOM CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
K2	YEL/GRN	Connect the battery positive terminal to K12 (K2) terminal, and K2(K12) terminal to H9 terminal	Check actuator operation: The driver's door lock actuator should lock (unlock).	Faulty driver's door lock actuator An open in the wire
K12	YEL/BLK			Faulty driver's door lock actuator An open in the wire
N7	YEL/BLK	Connect the battery positive terminal to N7 (N9) terminal, and N9 (N7) terminal to H9 terminal	Check actuator operation: The front passenger's door lock actuator should lock (unlock).	Faulty front passenger's door lock actuator An open in the wire
N9	YEL
H3	YEL/BLK	Connect the battery positive terminal to H3 (H10) terminal, and H10(H3) terminal to H9 terminal	Check actuator operation: The left rear door lock actuator should lock (unlock).	Faulty left rear door lock actuator An open in the wire
H10	YEL			Faulty left rear door lock actuator An open in the wire
E2	YEL/BLK	Connect the battery positive terminal to E2 (E8) terminal, and E8 (E2) terminal to H9 terminal	Check actuator operation: The right rear door lock actuator should lock (unlock).	Faulty right rear door lock actuator An open in the wire
E8	YEL			Faulty right rear door lock actuator An open in the wire
F5	RED/WHT	Connect the battery positive terminal to F5 terminal with the trunk lid main switch ON	Check actuator operation: The in-bed trunk lid actuator should unlock.	Poor ground(G601) Faulty in-bed trunk lid main switch Faulty in-bed trunk lid actuator An open in the wire
J14	BLK/YEL	Under all conditions	Attach to ground: The security indicator should come on.	Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box Faulty security indicator An open in the wire
N5	BLK/YEL	Under all conditions	Check for continuity between the N5 terminal and the gauge control module connector B(14P) No. 7 terminal: There should be continuity.	An open in the wire
N5	BLK/YEL	Gauge control module connector B(14P) disconnected	Check for continuity to ground: There should be no continuity.	Short to ground

Reconnect all connectors to the under-dash fuse/relay box. Turn the ignition switch ON (II), and make these input tests at the appropriate connectors on the 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 7.

PROBLEM SYMPTOM CHART

Cavity

Wire

Test condition

Test: Desired result

Possible cause if result is not obtained

BLK

Under all conditions

Check for voltage to ground There should be less than 0.5 V

Poor ground (G403)
An open in the wire

BLK

Under all conditions

Check for voltage to ground: There should be less than 0.5 V.

Poor ground (G501)
An open in the wire

P29⁽¹⁾

BRN/WHT

Front passenger's door lock knob switch unlocked

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

Poor ground (G402)
Faulty front passenger's door lock knob switch
An open in the wire

Front passenger's door lock knob switch locked

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

Faulty front passenger's door lock knob switch
Short to ground

PNK/BLU

Front passenger's door lock switch unlocked

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

Poor ground (G402)
Faulty front passenger's door lock switch
An open in the wire

Front passenger's door lock switch in neutral

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

Faulty front passenger's door lock switch
Short to ground

P25

PNK/BLK

Front passenger's door lock switch locked

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

Poor ground (G402)
Faulty front passenger's door lock switch
An open in the wire

Front passenger's door lock switch in neutral

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

Faulty front passenger's door lock switch
Short to ground

Q2⁽¹⁾

BLK/WHT

Left rear door lock knob switch unlocked

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

Poor ground (G501)
Faulty left rear door lock knob switch
An open in the wire

Left rear door lock knob switch locked

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

Faulty left rear door lock knob switch
Short to ground

Q3⁽¹⁾

BLK/RED

Right rear door lock knob switch unlocked

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

Poor ground (G501)
Faulty right rear door lock knob switch
An open in the wire

Right rear door lock knob switch locked

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

Faulty right rear door lock knob switch
Short to ground

Q12

RED/BLU

In-bed trunk lid handle switch ON

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

Poor ground (G602)
Faulty in-bed trunk lid handle switch
An open in the wire

In-bed trunk lid handle switch OFF

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

Faulty in-bed trunk lid handle switch
Short to ground

Q4⁽²⁾

GRY/BLU

In-bed trunk lid key cylinder switch unlocked

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

Poor ground (G602)
Faulty In-bed trunk lid key cylinder switch
An open in the wire

In-bed trunk lid key cylinder switch in neutral

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

Faulty In-bed trunk lid key cylinder switch
Short to around

P27⁽²⁾

RED/WHT

Under all conditions

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

Poor ground (G404)
Faulty connections at the audio unit
Faulty CD changer (with navigation system)
Faulty audio unit (without navigation system)
An open in the wire

P13

RED/WHT

Ignition key inserted into the ignition switch

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

Poor ground (G401)
Faulty ignition key switch
An open in the wire

Ignition switch OFF and ignition key removed from the ignition switch⁽³⁾

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

Faulty ignition key switch
Short to ground

E15

GRN

Driver's door open

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

Faulty driver's door switch
An open in the wire

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

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

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

Right rear door closed

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

Faulty right rear door switch
Short to ground

BLU/YEL

In-bed trunk lid open

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

Poor ground (G601)
Faulty In-bed trunk lid latch switch
An open in the wire

In-bed trunk lid closed

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

Faulty In-bed trunk lid latch switch
Short to ground

Q11

BLU/ORN

Tailgate open

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

Poor ground (G602)
Faulty tailgate switch
An open in the wire

Tailgate closed

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

Faulty tailgate switch
Short to ground

⁽¹⁾	RTS, RTL, and EXL models

⁽²⁾	RTS, RTL, and EXL models

⁽³⁾	After testing, insert the key into the ignition switch and turn the ignition switch ON (II) before continuing to the next step.

Relay Control Module

Turn the ignition switch OFF.
Remove the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).
Remove the under cover from the under-hood fuse/relay box, and disconnect the connector H (18P).

Fig 2: Identifying Under-Hood Fuse/Relay Box Connector H 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 11.

With the connector still disconnected, make these input tests at the connectors.

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 12.

PROBLEM SYMPTOM CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
H1 (H9)	BLU/RED	Under all conditions	Connect the battery power to the H1 H9 terminal momentarily: There horn should sound.	Faulty horn An open in the wire

Reconnect the connector to the under-hood fuse/relay box, turn the ignition switch ON (II) and make the input test at the appropriate connector on the under-hood fuse/relay box.

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

If the input test proves OK, go to step 13.

PROBLEM SYMPTOM CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
H2	GRN/BLK	Hood open	Check for voltage to ground: There should be less than 1 V.	Poor ground(G201) Faulty hood switch An open in the wire
H2	GRN/BLK	Hood closed	Check for voltage to ground: There should be 5 V or more.	Faulty hood switch Short to ground

Door Multiplex Control Unit

Turn the ignition switch OFF.
Remove the power window master switch (see PASSENGER'S POWER WINDOW MOTOR TEST ).
Disconnect the 23P connector from the power window master switch.

Fig 3: Identifying Door Multiplex Control Unit 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 17.

With the connector still disconnected, make these input tests at the connector.

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

If the input tests prove OK, go to step 18.

PROBLEM SYMPTOM CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
16	BRN/BLK	Under all conditions	Check for continuity between the No. 16 terminal and under-dash fuse/relay box connector J (21P) No. 4 terminal: There should be continuity.	An open in the wire
16	BRN/BLK	Under all conditions	Check for continuity between the No. 16 terminal and body ground: There should be no continuity.	A short in the wire

Reconnect the connector to the door multiplex control unit. Turn the ignition switch ON (II) and make these input tests at the connectors.

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 19.

PROBLEM SYMPTOM CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
1	BLK	Under all conditions	Check for voltage to ground: There should be less than 0.5 V.	Poor ground(G501) An open in the wire
15	WHT/RED	Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box. An open in the wire
20	YEL	Ignition switch ON (II)	Check for voltage to ground: There should be battery voltage.	Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box. An open in the wire
7	WHT/BLK	Driver's door lock knob switch unlocked	Check for voltage to ground: There should be less than 1 V.	Poor ground(G401) Faulty driver's door lock knob switch An open in the wire
7	WHT/BLK	Driver's door lock knob switch locked	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock knob switch Short to ground
22	YEL/RED	Driver's door lock knob switch locked	Check for voltage to ground: There should be less than 1 V.	Poor ground(G401) Faulty driver's door lock knob switch An open in the wire
22	YEL/RED	Driver's door lock knob switch unlocked	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock knob switch Short to ground
8	WHT/RED	Driver's door key cylinder switch in LOCK	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door key cylinder switch Poor ground(G401) An open in the wire
		Driver's door key cylinder switch in neutral	Check for voltage to ground: There should be 5 V or more.	Short to ground Faulty driver's door key cylinder switch
		Driver's door key cylinder switch in UNLOCK	Check for voltage to ground: There should be 5 V or more.	Short to ground Faulty driver's door key cylinder switch
21	WHT	Driver's door key cylinder switch in UNLOCK	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door key cylinder switch Poor ground(G401) An open in the wire
		Driver's door key cylinder switch in neutral	Check for voltage to ground: There should be 5 V or more.	Short to ground Faulty driver's door key cylinder switch
		Driver's door key cylinder switch in LOCK	Check for voltage to ground: There should be 5 V or more.	Short to ground Faulty driver's door key cylinder switch

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) (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), go to the B-CAN system input and output index (see B-CAN SYSTEM UNIT INPUT/OUTPUT DEVICE CONTROLLED ). If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU). If input failures are related to a particular control unit, replace that control unit.