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/panoramic glass roof/moonroof timer
	Wiper/washer
	Security
	Keyless entry
	Key interlock
	Power door locks
	Dashlights brightness
	Immobilizer
	Daytime running lights
	Keyless access control
	Climate control
	Seat heater

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

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
	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

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 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.
?	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
?	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 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.