Height Control Sensor Circuit

LIGHTING: LIGHTING SYSTEM: Height Control Sensor Circuit
- Height Control Sensor Circuit

DESCRIPTION

The height control sensor rear RH controls the resistance value based on changes vehicle height. The headlight beam level control ECU detects the changes in vehicle height from the transformed voltage. The headlight beam level control ECU outputs a constant voltage of 5 V to the SHB terminal of the height control sensor rear RH.

In the height control sensor sub-assembly rear RH, the voltage changes due to the resistance. The changes voltage is output from the SHRR terminal of the height control sensor rear RH to the headlight beam level control ECU, thus the vehicle's height is detected.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR RH

(a) Connect 3 dry cell batteries (1.5 V) in series.





(b) Remove the height control sensor sub-assembly rear.

(c) Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.

(d) Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

Standard voltage:





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

2. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR - HEADLIGHT BEAM LEVEL CONTROL ECU)

(a) Disconnect connector L9 of the height control sensor sub-assembly and connector A21 of the headlight beam level control ECU.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE