Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2016 2017 2018)

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.

Compare the symptom with this list of B-CAN related systems:

• Audio and audio-navigation
• Gauge control module
• Exterior lights
• Turn signals
• Entry light control
• Interior lights
• Safety indicators
• Horns (security and panic)
• Reminder chimes (Key-in, seat belt, lights-on, and parking brake)
• Power window/moonroof timer
• Wiper/washer
• Security
• Keyless entry
• Key interlock
• Power door locks
• Dashlights brightness
• Immobilizer
• Keyless access control
• Climate control
• Seat heater

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  If the symptom is related to the B-CAN, go to step 2.

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  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) , then turn the vehicle to the ON mode.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.

• Audio unit or audio-navigation unit
• MICU
• Gauge control module
• Climate control unit
• Automatic lighting control unit/sensor
• Immobilizer-keyless control unit
• Keyless access control unit
• Front 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.
• The HDS only checks the status one time when BODY ELECTRICAL is selected. To recheck the status after repair, reboot the HDS.

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  If all control units are communicating with the HDS, go to step 4.

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  If any of the control units are not communicating, go to B-CAN System Diagnosis Test Mode B .

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  If all units are not communicating or only the MICU is communicating, go to MICU DTC U1280 troubleshooting .

Select the system that has the problem from the BODY ELECTRICAL SYSTEM SELECT menu, then select DTCs.

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  If any DTCs are indicated, go to step 5.

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  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 .

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  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 door locks
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  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 (Key-in, seat belt, lights-on, and parking brake)
  • Security
  • Keyless entry
  • Dashlights brightness
  • Immobilizer
  • Rear window defogger (climate control)
  • Climate control
  • Keyless access control
  • Seat heater

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.