Troubleshooting - B-CAN System Diagnosis Test Mode A

Multiplex Integrated Control System Troubleshooting - B-CAN System Diagnosis Test Mode A

Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first Initial Inspection and Diagnostic Overview, then do this diagnosis first if the symptom is related to the B-CAN system.

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

- Gauge control module
- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Safety indicators
- Rear window defogger
- 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
- Power tailgate
- Power sliding doors
- Compass
- HandsFreeLink control unit

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 Diagnosis System (HDS), then turn the ignition switch to ON (II).

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

- MICU
- Door multiplex control unit (HDS name: Power window unit)
- Gauge control module
- Combination switch control unit
- Relay control module (HDS name: Relay unit)
- MICU-rear junction box (HDS name: Rear junction unit)
- Power seat control unit
- Power tailgate control unit
- Left power sliding door control unit
- Right power sliding door control unit
- A/C control panel/Front climate control unit (HDS name: Climate control unit/HVAC control unit)
- Automatic lighting control unit
- HandsFreeLink control unit

NOTE:

- If one or more of the units are communicating with the HDS, DETECT will be displayed.
- If the unit is not communicating or the vehicle is not equipped, "Not Available" is displayed.
- The HDS only checks the connected units 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 -

If any of the control units are not communicating, go to B-CAN System Diagnosis Test Mode B Troubleshooting - B-CAN System Diagnosis Test Mode B. If all units are not communicating or only the MICU is communicating, 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, and the system that is malfunctioning does not stop or turn off, go to B-CAN System Diagnosis Test Mode C Troubleshooting - B-CAN System Diagnosis Test Mode C. 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 Troubleshooting - B-CAN System Diagnosis Test Mode D.

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

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 system (if equipped)
- Driving position memory
- Power tailgate
- Power sliding door
- Compass
- 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.