Automatic Light Control Sensor Circuit

LIGHTING: LIGHTING SYSTEM: Automatic Light Control Sensor Circuit

Automatic Light Control Sensor Circuit

DESCRIPTION

The main body ECU receives signals from the automatic light control sensor.
HINT: A DTC is output when the automatic light control sensor is malfunctioning or there is an open or short circuit in the automatic light control sensor B1244.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK BODY ECU




(a) Disconnect the A24 sensor connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- CHECK WIRE HARNESS (SENSOR - BODY GROUND)
OK -- Continue to next step.

2. CHECK WIRE HARNESS (ECU - SENSOR)




(a) Disconnect the A24 sensor connector.
(b) Disconnect the B6 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

3. REPLACE AUTOMATIC LIGHT CONTROL SENSOR
OK:
Returns to normal operation.
NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- END
4. CHECK WIRE HARNESS (SENSOR - BODY GROUND)




(a) Disconnect the A24 ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- CHECK WIRE HARNESS (ECU - SENSOR)
OK -- Continue to next step.

5. CHECK WIRE HARNESS (ECU - SENSOR)




(a) Disconnect the A24 sensor connector.
(b) Disconnect the B6 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
6. CHECK WIRE HARNESS (ECU - SENSOR)




(a) Disconnect the A24 sensor connector.
(b) Disconnect the B6 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE