Diagnosis Procedure

1.CHECK FUSE

Turn ignition switch OFF.
Check that the following fuse is not blown (open)
Power source Fuse No. Capacity
Battery #28 20 A

Power source	Fuse No.	Capacity
Battery	#28	20 A

Is the fuse blown (open)?

Replace fuse after repairing the applicable circuit.

2.CHECK BOSE SPEAKER AMP. BATTERY POWER SUPPLY

Turn ignition switch OFF.
Disconnect BOSE speaker amp. harness connector.
Check the voltage between BOSE speaker amp. harness connector and ground.
(+) (−) Voltage
BOSE speaker amp.
Connector Terminal
B38 1 Ground Battery voltage

(+)	(−)	Voltage
B38	1	Ground	Battery voltage

Is the inspection result normal?

Perform trouble diagnosis for battery power supply circuit.

3.CHECK GROUND CIRCUIT

Turn ignition switch OFF.
Check the continuity between BOSE speaker amp. and ground.
(+) (−) Continuity
BOSE speaker amp.
Connector Terminal
B38 5 Ground Existed

(+)	(−)	Continuity
B38	5	Ground	Existed

Is the inspection result normal?

INSPECTION END

Repair or replace malfunctioning parts.