Lexus NX: Height Control Sensor Malfunction (B2416,B241A)
DESCRIPTION
The headlight ECU sub-assembly LH supplies 5 V to the rear height control sensor LH, reads changes in the voltage that occur due to height sensor resistance changes according to the vehicle height, and performs auto leveling control.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B2416 | Height Control Sensor Malfunction |
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| B241A | Rear Height Control Sensor |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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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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After the rear height control sensor sub-assembly LH is replaced or removed and installed, initialization is necessary.
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Before performing the check, check that the rear height control sensor sub-assembly LH is installed properly.
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PROCEDURE
| 1. | CHECK FOR DTC |
(a) Clear the DTCs.
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(b) Turn the power switch on (IG) and wait for at least 10 seconds or more.
(c) Check for DTCs.
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OK:
DTC B2416 and B241A are not output.
| OK | .gif) | USE SIMULATION METHOD TO CHECK |
|
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| 2. | 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 |
|
| 3. | CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH) |
(a) Disconnect the A19 headlight ECU sub-assembly LH connector.
(b) Disconnect the R1 rear height control sensor sub-assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A19-16 (SBR) - R1-3 (SHB) | Always | Below 1 Ω |
| A19-17 (SHRL) - R1-2 (SHRR) | Always | Below 1 Ω |
| A19-15 (SGR) - R1-1 (SHG) | Always | Below 1 Ω |
| A19-16 (SBR) or R1-3 (SHB) - Body ground | Always | 10 kΩ or higher |
| A19-17 (SHRL) or R1-2 (SHRR) - Body ground | Always | 10 kΩ or higher |
| A19-15 (SGR) or R1-1 (SHG) - 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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