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 |
| Main Body |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
HINT:
If the forward recognition camera stores a DTC for a malfunction of any of the following, this DTC will be stored simultaneously.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 |
|
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.
OK | ![]() | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
NG | ![]() | GO TO FRONT CAMERA SYSTEM |
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Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Window Defogger System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the window defogger system.
*: Use the Techstream.
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NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT:
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