Honda Accord: Control Unit Input Test

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

Driver's MICU

1. Turn the ignition switch to LOCK (0), and remove the driver's dashboard lower cover (see page 20-166).

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

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

CONNECTOR D (16P)

CONNECTOR Q (20P)

* : 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 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.

*: With moonroof

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 E (18P)

*1:4-door

*2: '08-09 models

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

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

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. R e c o n n e c t t h e c o n n e c t o r s to t h e p a s s e n g e r ' s u n d e r - d a s h f u s e / r e l a y b o x , a n d d o t h e s e input tests at t h e f o l l o w i ng c o n n e c t o r s .

• If a n y t e s t i n d i c a t e s a p r o b l e m , f i n d and c o r r e c t t h e c a u s e , t h e n r e c h e c k t h e s y s t e m .

• If a l l t h e i n p u t t e s t s p r o v e OK, g o t o s t e p 9.

*1: '08-09 models

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

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

Door Multiplex Control Unit

9. Turn the ignition switch to LOCK (0), and remove the power window master switch (see page 22-305).

10. Disconnect the 37P connector from the door multiplex control unit.

DOOR MULTIPLEX CONTROL UNIT 37P CONNECTOR

Wire side of female terminals

11. 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.

12. Reconnect the 37P connector to the door multiplex control unit 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 13.

13. 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.