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

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:

• 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/panoramic glass roof/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
• BSI system
• Seat heater
• Parking and back-up sensor system
• Power tailgate
• Wireless charger

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

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  If the symptom is not related to the B-CAN system, go to the system symptom troubleshooting.

2. Connect the HDS to the data link connector (DLC) .From the BODY ELECTRICAL system, select Mode Menu, then select the Connected Unit Menu to see if the following control units are communicating with the HDS.

• Body Control Module
• Relay control module
• Gauge control module
• Climate control unit
• Automatic lighting control unit-sensor
• Keyless access control unit
• Immobilizer-keyless control unit
• Door multiplex control unit
• Power tailgate control unit
• Power seat control unit
• Front seat heater control unit
• Parking and back-up sensor 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.

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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 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.

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  If any DTCs are indicated, go to step 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.