Audio System Symptom Troubleshooting - USB charger does not work

USB charger does not work

NOTE:

	Check the vehicle 12 volt battery condition first.
	Check the connectors for poor connections or loose terminals.
	Check the fuses and relays associated with the system, and check for a short in the related lines.

Problem verification:

Problem verification

?1.	Connect a known-good USB device to the USB port(s) of the USB charger unit.

?2.	Turn the vehicle to the ON mode.

Can the connection be checked (battery charging status) on the device?

Intermittent failure, the system is OK at this time. Inspect the connectors of the USB device and USB port for wear.?

The failure is duplicated, go to step 2.

Open wire check (?B BACK UP line):

Open wire check (?B BACK UP line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Disconnect the following connector.

USB charger unit 3P connector

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	USB charger unit 3P connector: disconnected
Test point 1	USB charger unit 3P connector No. 2
Test point 2	Body ground

Is there battery voltage?

The ?B BACK UP wire is OK. Go to step 3.

Repair an open in the wire.?

Open wire check (GND line):

Open wire check (GND line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	USB charger unit 3P connector: disconnected
Test point 1	USB charger unit 3P connector No. 3
Test point 2	Body ground

Is there continuity?

The GND wire is OK. Go to step 4.

Repair an open or high resistance in the ground wire or poor ground (G402).?

Open wire check (ACC line):

Open wire check (ACC line)

?1.	Turn the vehicle to the ON mode.

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	USB charger unit 3P connector: disconnected
Test point 1	USB charger unit 3P connector No. 1
Test point 2	Body ground

Is there battery voltage?

Repair an open in the wire.?