Height Control Sensor Circuit

LIGHTING: LIGHTING SYSTEM: Height Control Sensor Circuit

Height Control Sensor Circuit

DESCRIPTION

The headlight beam level control ECU receives the height control sensor signal from the height control sensor or height control ECU.
The headlight beam level control ECU calculates a height value from the height control signal. The voltage at the power source of the height control sensor is corrected when SHR is detected.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT REAR HEIGHT CONTROL SENSOR




(a) Connect 3 dry cell batteries (1.5 V) in series.
(b) Connect the positive (+) lead from the battery to terminal 3 (SHB) and negative (-) lead from the battery to terminal 1 (SHG).
(c) Measure the voltage between terminals 1 (SHG) and 2 (SHRL) when slowly moving the link up and down.
Standard voltage:






NG -- REPLACE REAR HEIGHT CONTROL SENSOR
OK -- Continue to next step.

2. CHECK WIRE HARNESS (SENSOR - ECU)




(a) Disconnect the H18 sensor connector.
(b) Disconnect the H12 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 INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE