B241A

LIGHTING (EXT): LIGHTING SYSTEM: B241A: Rear Height Control Sensor
B241A - Rear Height Control Sensor

DESCRIPTION

The headlight leveling ECU assembly receives signals indicating the height of the vehicle from the rear height control sensor sub-assembly.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If either of the following work has been performed, initialization of the headlight leveling ECU assembly is necessary Initialization.

* Replacement of the headlight leveling ECU assembly.
* Replacement or removal/installation of the rear height control sensor sub-assembly or work that changes the vehicle height such as replacement of suspension components.

PROCEDURE

1. CHECK FOR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B241A is not output.

NG -- READ VALUE USING TECHSTREAM

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

2. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL Auto Leveling / Data List.

(e) Read the display on the Techstream.

HL Auto Leveling





OK:

Normal conditions listed above are displayed.

NG -- INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY

OK -- REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Removal

3. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY

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





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

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

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

Standard Voltage:





Text in Illustration





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

4. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - REAR HEIGHT CONTROL SENSOR)

(a) Disconnect the A46 headlight leveling ECU assembly connector.

(b) Disconnect the R2 rear height control sensor sub-assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Removal