Rear Height Control Sensor (B241A)

DESCRIPTION

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

DTC No.	DTC Detecting Condition	Trouble Area
B241A	Malfunction in rear height control sensor sub-assembly RH Open or short in rear height control sensor sub-assembly RH circuit	Rear height control sensor sub-assembly RH Harness or connector Headlight leveling ECU assembly

WIRING DIAGRAM
CAUTION / NOTICE / HINT

NOTICE:

If either of the following is performed, initialization of the headlight leveling ECU assembly is necessary (See page ).

• 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 (See page ).

(b) Check for DTCs (See page ).

OK:

DTC B241A is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Height Sens Pw Supply Val	Rear height control sensor power supply value / 0.00 to 5.00 V	Approx. 5 V	-
Rr Height Sens Signal Val	Rear height control sensor signal value / 0.00 to 5.00 V	Approx. 2.5 V (When the vehicle is level)	Value changes according to vehicle height

OK:

Normal conditions listed above are displayed.

OK

REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

NG

1. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH

(a) Remove the rear height control sensor sub-assembly RH (See page ).

(b) Inspect the rear height control sensor sub-assembly RH (See page ).

NG

REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH

OK

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

(a) Disconnect the A40 headlight leveling ECU assembly connector.

(b) Disconnect the N1 rear height control sensor sub-assembly RH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A40-19 (SHRL) - N1-2 (SHRR)	Always	Below 1 Ω
A40-19 (SHRL) - Body ground	Always	10 kΩ or higher

OK

REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR