Diagnosis Procedure
1.
CHECK FUSE
Check that the following fuse is not blown (open).
Power source
Fuse No.
Capacity
ACC power supply
#40
10 A
Is the fuse blown (open)?
Be sure to eliminate cause of malfunction before installing new fuse.
.
2.
CHECK IGNITION POWER SUPPLY CIRCUIT
Turn ignition switch ON.
Check voltage between sonar control unit harness connector and ground.
(+)
(-)
Standard
Reference value
Sonar control unit
Connector
Terminal
B20
12
Ground
9.0 - 16.0 V
Battery voltage
Is the inspection result normal?
.
Repair or replace sonar control unit power supply harness.
3.
CHECK GROUND CIRCUIT
Turn ignition switch OFF.
Disconnect sonar control unit connector.
Check continuity between sonar control unit harness connector and ground.
Sonar control unit
Ground
Continuity
Connector
Terminal
B20
15
Existed
Is the inspection result normal?
INSPECTION END
Repair or replace sonar control unit ground harness.