Troubleshooting - B-CAN System Diagnosis Test Mode A

Check the PCM for DTCs and troubleshoot PCM (see GENERAL TROUBLESHOOTING INFORMATION ) or F-CAN loss of communication errors first, then perform 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
   • Rear window defogger
   • Horns (security and panic)
   • Chimes (key-in, seat belt, lights-on and parking brake)
   • Power windows
   • Power window/moonroof timer
   • Wiper/washer
   • Security
   • Keyless entry
   • Power door locks
   • Climate control or HVAC control
   • Key interlock
   • Dashlights brightness
   • Driving position memory
   • Power tailgate
   • Immobilizer
   • Parking and back-up sensor system
   • 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.

2. Connect the HDS to the data link connector (A), then turn the ignition switch to ON (II).
   Fig 1: Identifying Data Link Connector

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
3. 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
   • Gauge control module
   • Automatic lighting control unit
   • Power seat control unit (HDS name: Memory seat control unit)
   • Door multiplex control unit (HDS name: Power window unit)
   • Rear MICU
   • Power tailgate control unit
   • Climate control unit or HAVC control unit
   • Immobilizer-keyless control unit
   • Parking and back-up sensor control unit (HDS name: Parking sensor module)
   • Seat heater control unit
   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.

   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 the DTC U1280 troubleshooting (see DTC U1280: COMMUNICATION CIRCUIT ERROR (BUS-OFF)  ).

4. Select the system that has the problem from BODY ELECTRICAL 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)
   • 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-in, seat belt and lights-on)
   • Rear window defogger (climate or HVAC control)
   • Security
   • Keyless entry
   • Climate control or HVAC control
   • Key interlock
   • Dashlights brightness
   • Navigation (if equipped)
   • Driving position memory
   • Power tailgate
   • Immobilizer
   • Seat heater
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 DTC B1008 and B1011 are retrieved, troubleshoot DTC B1008 first). Refer to LOSS OF COMMUNICATION DTC CROSS REFERENCE CHART  .
   • Signal error DTCs.