Lexus ES: 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 | DTC Output from |
B124B | Automatic High Beam System | Malfunction in automatic high beam system | -
Front camera system
-
Dynamic radar cruise control system
-
Lane control system
-
Road sign assist system*
-
Pre-collision system
-
SFI system
-
Electronically controlled brake system
-
CAN communication system
-
Forward recognition camera
-
Main body ECU (multiplex network body ECU)
| Main Body |
-
*: w/ Road Sign Assist System
WIRING DIAGRAM
CAUTION / NOTICE / HINT
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
-
Yaw rate sensor
-
Millimeter wave radar sensor
-
CAN communication system
PROCEDURE
1. | CHECK FOR DTC (HEALTH CHECK) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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 and other DTCs are output | B |
B | | GO TO OTHER DTC CHART |
A | | |
2. | CHECK FRONT CAMERA SYSTEM |
(a) Check if a dynamic radar cruise control system, lane control system, road sign assist system* or pre-collision system warning message is displayed on the multi-information display.
Click here
OK:
No dynamic radar cruise control system, lane control system, road sign assist system* or pre-collision system warning messages are displayed.
-
*: w/ Road Sign Assist System
OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
NG | | GO TO FRONT CAMERA SYSTEM |
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SEE MORE:
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