Lexus ES: 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 |
|
| 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.
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If any of the following are performed, it is necessary to initialize the headlight ECU sub-assembly LH.
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- 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 engine 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
|
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| 2. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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 CodesOK:
DTC B241A is not output.
| OK | .gif) | USE SIMULATION METHOD TO CHECK |
|
| 3. | INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH |
(a) Remove the rear height control sensor sub-assembly LH.
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(b) Inspect the rear height control sensor sub-assembly LH.
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| NG | | REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH |
|
| 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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