Troubleshooting - B-CAN System Diagnosis Test Mode A

Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first (see GENERAL TROUBLESHOOTING INFORMATION ), then perform 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
   • Heated windshield wiper area
   • 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/HVAC control
   • Key interlock
   • Dash light brightness

   Is the symptom related to the B-CAN system? 

   1. YES  - Go to step  2.
   2. NO  - Go to the system troubleshooting for the system with the symptom.
2. Connect the HDS to the DLC, 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 the following control units are communicating with the HDS.
   • MICU
   • Door multiplex control unit
   • Gauge control module
   • Combination switch control unit
   • Relay control module
   • Climate control unit/HVAC control unit
   NOTE:

   • On gauge control modules produced before April 2005, stored gauge control gauge module DTCs cannot be read using the HDS. On cars with these gauge control modules; "Not Available" will be in the CONNECTED UNIT STATUS Gauge control module DTCs can be displayed, and all B-CAN DTCs can be cleared using test mode 1 (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)  ).
   • If one or more of the units are not communicating with 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? 

   1. YES  - Go to step  4.
   2. NO  - If any of the control units are not communicating, go to B-CAN System Diagnosis Test Mode B (see 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 (see DTC B1000: Communication Bus Line Error  ).
4. Select the system that has the problem from the BODY ELECTRICAL SYSTEM SELECTION MENU, then select DTCs.

   Are any DTCs indicated? 

   1. YES  - Go to step  5.
   2. NO  - If the problem is related to one of the following items, go to B-CAN System Diagnosis Test Mode C (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE C  ).
   • Exterior lights
   • Turn signals
   • Entry light control
   • Interior lights
   • Horns (security and panic)
   • Power windows
   • 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, seat belt and lights-on)
   • Heated windshield wiper area (climate control)
   • Security
   • Keyless entry
   • Climate control
   • Key interlock
   • Dash light brightness
   • Audio system
   • Navigation
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 B1006 and B1058 are retrieved, begin by troubleshooting B1006).
   • Signal error DTCs.