Lexus NX: Automatic High Beam System (B124B)
DESCRIPTION
The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the forward recognition camera.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B124B | Automatic High Beam System | Malfunction in automatic high beam system |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom
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HINT:
If the forward recognition camera stores a DTC for a malfunction of any of the following, this DTC will be stored simultaneously.- Speed sensor malfunction
- Yaw rate sensor malfunction
- Steering sensor malfunction
- CAN communication system
PROCEDURE
| 1. | CHECK FOR DTC (HEALTH CHECK) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: System Select / Health Check.
(e) Check for DTCs.
| Result | Proceed to |
|---|---|
| Only DTC B124B is output | A |
| DTC B124B is output at the same time | B |
| B | .gif) | GO TO OTHER DTC CHART |
|
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| 2. | CHECK FORWARD RECOGNITION CAMERA |
(a) Check if a dynamic radar cruise control system, lane tracing assist system, road sign assist system and pre-collision system warning message are displayed on the combination meter assembly.
Click here
OK:
No dynamic radar cruise control system, lane tracing assist system, road sign assist system and pre-collision system warning messages are displayed.
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | GO TO FRONT CAMERA SYSTEM |
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Freeze Frame Data
FREEZE FRAME DATA CHECK FREEZE FRAME DATA (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 / Navigation System / Trouble Codes. Body Electrical > Navigation System > Trouble Codes (e) Select a
Automatic High Beam
The Automatic High Beam uses an
in-vehicle camera sensor to assess
the brightness of streetlights, the
lights of oncoming and preceding
vehicles, etc., and automatically
turns high beam on or off as necessary.
WARNING
â– Limitations of the Automatic High
Beam
Do not rely on the Automatic Hi
