Diagnosis Procedure

1. Turn ignition switch OFF.
2. Check that the following fuses are not blown (open).

   Power source	Fuse No.	Capacity
   Battery	#15	15 A
   Ignition switch ACC	#65	10 A
   Ignition switch ON	#29	5 A

Are the fuses blown (open)?

YES

Replace fuse after repairing the applicable circuit.

NO

GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect NAVI control unit harness connector.
3. Check the voltage between NAVI control unit harness connector and ground.

   Terminals			Voltage (Approx.)
   (+)		(-)
   NAVI control unit
   Connector	Terminal
   M140	1	Ground	Battery voltage
   	15

Is the inspection result normal?

YES

GO TO 3.

NO

Perform trouble diagnosis for battery power supply circuit.

1. Turn ignition switch ACC.
2. Check the voltage between NAVI control unit harness connector and ground.

   Terminals			Voltage (Approx.)
   (+)		(-)
   NAVI control unit
   Connector	Terminal
   M140	5	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 4.

NO

Perform trouble diagnosis for accessory power supply circuit.

1. Turn ignition switch ON.
2. Check the voltage between NAVI control unit harness connector and ground.

   Terminals			Voltage (Approx.)
   (+)		(-)
   NAVI control unit
   Connector	Terminal
   M140	19	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5.

NO

Perform trouble diagnosis of ignition power supply circuit.

1. Turn ignition switch OFF.
2. Check the continuity between NAVI control unit and ground.

   Terminals			Continuity
   (+)		(-)
   NAVI control unit
   Connector	Terminal
   M140	3	Ground	Yes
   	17

Is the inspection result normal?

YES

Inspection End.

NO

Repair or replace malfunctioning parts.