Honda Accord: MICU Input Test - Exterior Lights - Body Electrical - Honda Accord MK8 2008-2012 Service ManualHonda Accord: MICU Input Test

NOTE: • Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A {see page 22-134).

• Before testing, make sure the No. 15 (7.5 A) fuse In the driver's under-dash fuse/relay box is OK.

Driver's MICU

1. Turn the ignition switch to LOCK (0), and remove the driver's dashboard lower cover.

2. Disconnect driver's under-dash fuse/relay box connectors B, D. F Q. and R.

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

3. Inspect the connector and socket terminals to be sure they are all making


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. With the connectors still disconnected, 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 5.

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


5. 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 6.


Passenger's MICU


Passenger's MICU

6. 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)

7. Disconnect passenger's under-dash fuse/relay box connectors A and E.

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


*: '08-09 models


*: '08-09 models

8. With the connectors still disconnected, 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: With automatic lighting


*1: With automatic lighting

*2: Without automatic lighting

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

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

• If all input tests prove OK, go to step 10.

* : '08-09 models


* : '08-09 models

10. 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.

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    See also:

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    Circuit Diagram
    ...