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 (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
	Daytime running lights
	Driving position memory system
	Keyless access control
	Climate control

?	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 press the engine start/stop button to select 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.

	MICU
	Gauge control module
	Climate control unit
	Automatic lighting control unit-sensor^*1
	Automatic lighting/rain sensor^*2
	Door multiplex control unit
	Immobilizer-keyless control unit^*3
	Keyless access control unit^*4
	Power seat control unit
	Auto high-beam control unit
	Parking and back-up sensor control unit
	Wireless charger

*1: With automatic lighting without automatic wiper
*2: With automatic lighting and automatic wiper
*3: Without keyless access system
*4: With keyless access system

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.?
?	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.

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.?

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 window
	Power door locks
	Key interlock

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
	Keyless access control
	Driving position memory system

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.