B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2018-19)

Check the PCM for DTCs and troubleshoot 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
• Auto-high beam
• Audio, navigation, and telematics control
• 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
• Key interlock
• Power door locks
• Dashlights brightness
• Immobilizer
• Daytime running lights
• Driving position memory system
• Keyless access control
• Climate control
• Multi view camera system
• BSI system
• Seat heater
• Wireless charger

• 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) .

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
• Climate control unit
• Automatic lighting/rain sensor
• Automatic lighting control unit-sensor
• Keyless access control unit
• Door multiplex control unit
• Power seat control unit
• Parking and back-up sensor control unit
• Left side BSI radar unit
• Right side BSI radar unit
• Telematics control unit
• Front seat heater control unit/Ventilated seat control unit
• Multipurpose camera unit
• Multi view camera 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.
• 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 (2018-19) .
• If all units are not communicating or only the MICU is communicating, go to MICU DTC U1280 troubleshooting - Refer to: DTC Troubleshooting: U1280 (MICU) (2018-19) .

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.
• 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 - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFF 
• 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 - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON 
• • 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
  • Reminder chimes (seat belt, lights-on, and parking brake)
  • Security
  • Keyless entry
  • Dashlights brightness
  • Immobilizer
  • Rear window defogger (climate control)
  • Climate control
  • Keyless access control
  • Driving position memory system
  • Parking and back-up sensor system
  • Seat heater

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.