Diagnosis Procedure
1.
CHECK ACCESSORY RELAY CONTROL SIGNAL VOLTAGE
Ignition switch OFF.
Disconnect BCM connector.
Check voltage between BCM harness connector and ground.
+
-
Voltage
BCM
Connector
Terminal
M18
34
Ground
9 – 16 V
Is the inspection result normal?
Replace BCM. Refer to
Removal and Installation
.
2.
CHECK ACCESSORY RELAY CONTROL SIGNAL CIRCUIT (OPEN)
Remove accessory relay.
Check continuity between BCM harness connector and fuse block (J/B) terminal.
BCM
Fuse block (J/B)
Continuity
Connector
Terminal
Terminal
M18
34
Accessory relay coil downstream side
Existed
Is the inspection result normal?
Repair the harness or connector.
3.
CHECK ACCESSORY RELAY CONTROL SIGNAL CIRCUIT (SHORT TO GROUND)
Check continuity between BCM harness connector and ground.
BCM
—
Continuity
Connector
Terminal
M18
34
Ground
Not existed
Is the inspection result normal?
Repair the harness or connector.
4.
CHECK ACCESSORY RELAY
Check accessory relay. Refer to
Component Inspection
.
Is the inspection result normal?
INSPECTION END
Replace accessory relay.