Lexus ES manuals

Lexus ES: Rear Height Control Sensor (B241A)

Lexus ES (XZ10) Service Manual / Vehicle Interior / Lighting (ext) / Lighting System (for Hv Model) / Rear Height Control Sensor (B241A)

DESCRIPTION

The headlight ECU sub-assembly LH determines the vehicle height and performs automatic headlight beam level control based on signals from the rear height control sensor sub-assembly LH via direct line.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B241A

Rear Height Control Sensor
  • The power switch is on (IG).
  • Abnormal vehicle height continuously detected
  • 10 seconds or more
  • Rear height control sensor sub-assembly LH
  • Harness or connector
  • Headlight ECU sub-assembly LH

AFS

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

    Click here

  • If any of the following are performed, it is necessary to initialize the headlight ECU sub-assembly LH.

    Click here

    • Replacement of the rear height control sensor sub-assembly LH
    • Removal/installation of the rear height control sensor sub-assembly LH
    • Work that changes the vehicle height such as replacement of suspension components
  • When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.

CLEAR DTC

(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 / AFS / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

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

(c) Wait 10 seconds or more.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / AFS / Trouble Codes.

(f) Check for DTCs.

Body Electrical > AFS > Trouble Codes

OK:

DTC B241A is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH

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

Click here

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

Click here

NG

REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH

OK

4.

CHECK HARNESS AND CONNECTOR (REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY LH)

(a) Disconnect the A78 headlight ECU sub-assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O3-3 (SHB) - A78-16 (SBR)

Always

Below 1 Ω

O3-2 (SHRR) - A78-17 (SHRL)

Always

Below 1 Ω

O3-1 (SHG) - A78-15 (SGR)

Always

Below 1 Ω

O3-3 (SHB) or A78-16 (SBR) - Body ground

Always

10 kΩ or higher

O3-2 (SHRR) or A78-17 (SHRL) - Body ground

Always

10 kΩ or higher
OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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