Troubleshooting - B-CAN System Diagnosis Test Mode A

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

Check the PCM for DTCs and troubleshoot PCM (see GENERAL TROUBLESHOOTING INFORMATION ) or F-CAN loss of communication errors first, then do this diagnosis if the symptom is related to the B-CAN system.

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/moonroof timer
- Wiper/washer
- Security
- Keyless entry
- Power door locks
- Key interlock
- Dashlights brightness
- Immobilizer
- Daytime running lights
- Driving position memory system
- XM radio
- Climate control
- Parking and back-up sensor system
- Power tailgate
- BSI system
- Power sliding doors
- Seat heater
  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.
Connect the HDS to the data link connector (DLC) (A), then turn the ignition switch to ON (II).

Fig 1: Identifying Data Link Connector (DLC)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS 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
- Immobilizer-keyless control unit
- Climate control unit
- Audio unit
- Power seat control unit (HDS name: Memory seat control unit)
- Power tailgate control unit
- BSI control unit
- Relay control module
- Seat heater control unit
- Left power sliding door control unit
- Right power sliding door control unit
- Rear MICU
  NOTE:
  - If a unit is communicating with the HDS, DETECT is displayed.
  - If a unit is not communicating or the vehicle is not equipped, "NOT AVAILABLE" is displayed.
  - The HDS only checks the status one time when BODY ELECTRICAL is selected. To recheck the status after repair, reboot the HDS.
  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 . If all units are not communicating or only the MICU is communicating, go to DTC U1280 troubleshooting (see DTC U1280: COMMUNICATION BUS LINE ERROR (BUS-OFF) ).
Select the system that has the problem from the BODY ELECTRICAL SYSTEM SELECT 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 . If the problem is related to one of the following items and the system that is malfunctioning does not run or turn on, go to B-CAN SYSTEM DIAGNOSIS TEST MODE D .
- Exterior lights
- Turn signals
- Entry light control
- Interior lights
- Horns (security and panic)
- Wiper/washer
- Power window
- 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-in, seat belt, lights-on, and parking brake)
- Security
- Keyless entry
- Key interlock
- Dashlights brightness
- Audio system
- Immobilizer
- Driving position memory system
- Rear window defogger (climate control)
- Climate control
- Parking and back-up sensor system
- Power tailgate
- BSI system
- Power sliding doors
- Seat heater
Record all DTCs, and sort them by DTC type.
Troubleshoot the DTC(s) in this order:
- Battery voltage DTCs.
- Internal error DTCs.
- Loss of communication DTCs.
- Signal error DTCs.