Honda Accord: MICU Input Test - Safety Indicator System - Body Electrical - Honda Accord MK8 2008-2012 Service ManualHonda Accord: MICU Input Test

NOTE: # Before t e s t i n g , t r o u b l e s h o o t the m u l t i p l e x i n t e g r a t e d control unit first, using B-CAN System D i a g n o s i s Test Mode A (see page 22-134).

• Before t e s t i n g , do the gauge c o n t r o l module s e l f - d i a g n o s i s f u n c t i o n (see page 22-332), and make sure the s a f e ty i n d i c a t o r LEDs and B-CAN c o m m u n i c a t i o n line are OK.

Driver's MICU

1. Turn the ignition switch to LOCK (0), and remove the driver's d a s h b o a r d lower cover (see page 20-166).

2. D i s c o n n e c t d r i v e r ' s under-dash fuse/relay box c o n n e c t o r s D, Q, and R.

NOTE: All c o n n e c t o r v i e w s are w i r e side of f e m a l e t e r m i n a l s .

CONNECTOR D(16P)

CONNECTOR Q (20P)


CONNECTOR Q (20P)

CONNECTOR R (24P)


CONNECTOR R (24P)

*: 4-door


*: 4-door

3. 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 .

4. Reconnect the connectors to the driver's under-dash fuse/relay box, and do these input tests at the following 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 5.

Passenger's MICU


Passenger's MICU

5. Turn the ignition switch to LOCK (0), and remove the passenger's kick panel.

• 2-door (see page 20-105) • 4-door (see page 20-107) 6. Disconnect passenger's under-dash fuse/relay box connectors A, E, and G # 1 (or H*2).

*1: LX, LX PZEV, LX-P, LX-P PZEV

*2: Except LX, LX PZEV, LX-P, LX-P PZEV

NOTE: All connector views are wire side of female terminals.

CONNECTOR A (38P)

CONNECTOR G (16P)


CONNECTOR G (16P) (LX, LX PZEV, LX-P, LX-P PZEV)

CONNECTOR H (38P)


CONNECTOR H (38P) (Except LX, LX PZEV, LX-P, LX-P PZEV)

CONNECTOR E (18P)


CONNECTOR E (18P)

*1: 4-door


*1: 4-door

*2: '08-09 models

7. 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 8.

8. Reconnect the connectors to the passenger's under-dash fuse/relay box, and do these input tests at the following 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 9.

*1:'08-09 models


*1:'08-09 models

*2: LX, LX PZEV, LX-P, LX-P PZEV

*3: Except LX, LX PZEV, LX-P, LX-P PZEV

9. 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).

• USA models (see page 22-86) • Canada models (see page 22-87) If input failures are related to a particular control unit, replace the control unit

    Circuit Diagram
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    Reminder Systems
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