Troubleshooting - B-CAN System Diagnosis Test Mode A

Troubleshooting - B-CAN System Diagnosis Test Mode A

Check the ECM/PCM for DTCs and troubleshoot ECM/PCM or F-CAN loss of communication errors first, then perform this diagnosis first if the symptom is related to the B-CAN system.

NOTE: Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures.

1. Check the symptom against this list of B-CAN related systems:

- Gauge control module
- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Safety indicators
- Rear window defogger
- HandsFreeLink
- Horns (security and panic)
- Chimes (key, seat belt, lights-on and parking brake)
- Power windows
- Power window/moonroof timer
- Wiper/washer
- Security
- Keyless entry
- Power door locks
- Climate control
- Key interlock
- Dash light brightness
- Driving position memory

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 Honda Diagnostic System (HDS), then turn the ignition switch ON (II).
3. From the BODY ELECTRICAL SYSTEM SELECTION MENU, select UNIT INFORMATION, and then select CONNECTED UNIT listed to see if it is communicating with the HDS.

- MICU
- Door multiplex control unit
- Gauge control module
- Combination switch control unit
- Relay control module
- Display panel control unit
- Power seat control unit
- HandsFreeLink control unit
- Automatic lighting control unit
- AcuraLink control unit (XM receiver)

NOTE:
- If the unit is communicating with the scan tool or the HDS, DETECT will be displayed.
- If the unit is not communicating or the vehicle is not equipped, "Not Available" will be displayed.

Are all control units communicating with the HDS?

YES - Go to step 4.

NO - If all units are not communicating, or if only the MICU is detected, go to DTC B1000 troubleshooting. B1000

4. Select the system that has the problem from the BODY ELECTRICAL SYSTEM SELECTION MENU, then select DTCs.

Are any DTCs indicated?

YES - Go to step 5.

NO - If the problem is related to one of the following items, go to B-CAN System Diagnosis Test Mode C.

- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Horns (security and panic)
- Power windows
- Wiper/washer
- Power door locks

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, seat belt and lights-on)
- Rear window defogger (climate control)
- Security
- Keyless entry
- Climate control
- Key interlock
- Dash light brightness
- Audio system
- Navigation
- Driving position memory
- HandsFreeLink

5. Record all DTCs, and sort them by DTC type.
6. Troubleshoot the DTC(s) in this order:

- Battery voltage DTCs.
- Internal error DTCs.
- Loss of communication DTCs. Begin troubleshooting with the lowest number first (Example: if DTCs B1006 and B1058 are retrieved, begin by troubleshooting B1006).
- Signal error DTCs.