Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks

Check the PCM for DTCs and troubleshoot the PCM or F-CAN loss of communication errors first, then do 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
   • Horns (security and panic)
   • Reminder chimes (seat belt, lights-on, and parking brake)
   • Power window/moonroof timer
   • Wiper/Washer
   • Security
   • Keyless entry
   • Power door locks
   • Dashlights brightness
   • Immobilizer
   • Daytime running lights
   • Driving position memory system
   • Front passenger's power seat
   • Keyless access control
   • Climate control
   • Ventilated seat
   • Seat heater
   • Parking and back-up sensor system
   • Power tailgate
   • Audio and visual system
   • Telematics system
   • Driving support
   • BSI system
   • Head up display
   • If the symptom is related to the B-CAN, go to step 2.
   • If the symptom is not related to the B-CAN, go to the system symptom troubleshooting.
2. Connect the HDS to the data link connector (DLC) (A), then turn the vehicle to the ON mode.

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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.
   • Body control module
   • Gauge control module
   • Climate control unit
   • Automatic lighting control unit-sensor
   • Power window master switch
   • Driver's power seat control unit
   • Front passenger's power seat control unit
   • Parking and back-up sensor control unit
   • Power tailgate control unit
   • Power distribution module
   • Front seat heater control unit
   • Ventilated seat control unit
   • Audio unit
   • Telematics control unit
   • Left side BSI radar unit
   • Right side BSI radar unit
   • Multipurpose camera unit
   • Head up display
   • Adaptive front lighting control unit
   • Master lighting control unit
   • Wireless charger
   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.

   • If all control units are communicating with the HDS, go to step 4.
   • If any of the control units are not communicating, go to B-CAN System Diagnosis Test Mode B - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating .
   • If all units are not communicating or only the body control module is communicating, go to body control module DTC U1280 troubleshooting .
4. Select the system that has the problem from the BODY ELECTRICAL SYSTEM SELECT menu, then select DTCs.
   • If any DTCs are indicated, go to step 5.
5. Record all DTCs, and sort them by DTC type, then troubleshoot them in this order:
   • Internal error DTCs.
   • Loss of communication DTCs.
   • Signal error DTCs.