Honda Accord: Troubleshooting
B-CAN System Diagnosis Test Mode
A - Multiplex Integrated Control
System - Body Electrical - Honda Accord MK8 2008-2012 Service ManualHonda Accord: Troubleshooting B-CAN System Diagnosis Test Mode A

Check the ECM/PCM for DTCs and troubleshoot .

ECM/PCM (see page 11-3) or F-CAN loss of communication errors first, then do this diagnosis if the symptom is related to the B-CAN system.

1. Compare the symptom with this list of B-CAN related systems:

• Gauge control module

• Exterior lights

• Turn signals

• Entry light control

• Interior lights

• Safety indicators

• Horns (security and panic)

• Chimes (key-in, seat belt, lights-on, and parking brake)

• Power window/moon roof timer

• Wiper/washer

• Security

• Keyless entry

• Power door locks

• Key interlock

• Dashlight brightness

• Immobilizer

Is the symptom related to the B-CAN system? YES

-Go to step 2.

NO

-Go to the system troubleshooting for the system with the symptom.

2. Connect the HDS to the data link connector (A), then turn the ignition switch to ON (II).

3. From the BODY ELECTRICAL menu, select UNIT


3. From the BODY ELECTRICAL menu, select UNIT INFORMATION, and then select CONNECTED UNIT listed to see if the following control units are communicating with the HDS.

• Driver's MICU

• Passenger's MICU

• Door multiplex control unit (HDS name: Power window unit)

• Gauge control module

• Immobilizer-keyless control unit

•  Climate/HVAC control unit

• HandsFreeLink unit

• Audio unit (with premium audio system)

NOTE: • If a unit is communicating w i t h the HDS, DETECT will be displayed.

• If a unit is not communicating or the vehicle is not equipped, "NOT AVAILABLE" will be displayed.

• The HDS only checks the connected unit status one time when BODY ELECTRICAL is selected. To recheck the status after repair, reboot the HDS and repeat step 3.

Are all control units communicating with the HDS? YES

-Go to step 4.

NO

-lf any of the control units are not communicating, go to B-CAN System Diagnosis Test Mode B (see page 22-135). If all units are not communicating or only the driver's MICU is communicating, go to DTC U1280 troubleshooting (see page 22-148).

4. Select the system that has the problem from the BODY ELECTRICAL.menu, then select DTCs.

Are any DTCs indicated? YES-Go to step 5.

NO-lf the problem is related to one of the following items and the system that is malfunctioning does not stop or turn off, go to B-CAN System Diagnosis Test Mode C (see page 22-136). If the problem Is related to one of the following items and the system that is malfunctioning does not work or turn on, go to B-CAN System Diagnosis Test Mode D (see page 22-137).

• Exterior lights

• Turn signals

• Entry lights

• Interior lights

• Horns (security and panic)

• Wiper/washer

If the problem is related to one of the following items, go to the troubleshooting for that individual system.

• Gauge control module

• Safety indicators

• Chimes (key-in, seat belt, lights-on, and parking brake)

• Security

• Keyless entry

• Key interlock

• Dashlight brightness

• Audio system

• Navigation (if equipped)

5. Record all DTCs, and sort them by DTC type into these categories:

• Battery voltage DTCs

• Internal error DTCs

• Loss of communication DTCs

• Signal error DTCs

6. Troubleshoot the DTC(s) in the order listed above.

    System Description
    Body Controller Area Network (B-CAN) and Fast Controller Area Network (F-CAN) The body controller area network (B-CAN) and the fast controller area network (F-CAN) share information between mult ...

    B-CAN System Diagnosis Test Mode B
    Do this diagnosis if any of the control units are not communicating (Not Available is displayed in the HDS) as found by the B-CAN System Diagnosis Test Mode A (see page 22-134). 1. Using the HDS ...

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