Toyota Tacoma (2015-2018) Service Manual: Automatic High Beam System (B124B)

Toyota Tacoma (2015-2018) Service Manual / Lighting / Lighting System / 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	Forward recognition camera system Dynamic radar cruise control system Lane departure alert system Pre-collision system SFI system Vehicle stability control system CAN communication system Forward recognition camera Main body ECU (multiplex network body ECU)

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

Click here 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 malfunction
Yaw rate sensor malfunction
Steering sensor malfunction
CAN communication lost

PROCEDURE

1.	CHECK FOR DTC (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: System Select / Health Check.

(e) Check for DTCs.

Result

Result	Proceed to
Only DTC B124B is output	A
DTC B124B is output at the same time	B

GO TO OTHER DTC CHART

2.	CHECK FORWARD RECOGNITION CAMERA

(a) Check if a dynamic radar cruise control system, lane departure alert system and pre-collision system warning message are displayed on the combination meter assembly.

Click here OK:

OK:

No dynamic radar cruise control system, lane departure alert system and pre-collision system warning messages are displayed.

Proceed to
OK
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

GO TO FORWARD RECOGNITION CAMERA SYSTEM

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" ...

Automatic High Beam Camera (B124C)

DESCRIPTION The main body ECU (multiplex network body ECU) detects a high beam headlight illumination request signal of the automatic high beam system from the forward recognition camera ...

Other materials:

Removal
REMOVAL PROCEDURE 1. REMOVE FRONT WHEEL 2. REMOVE REAR WHEEL 3. REMOVE TIRE PRESSURE WARNING VALVE AND TRANSMITTER (a) Remove the cap and valve core to release the air from the tire. NOTICE: Keep the removed cap and valve core. (b) After ensuring that a sufficient amount of air has been rele ...

Components
COMPONENTS ILLUSTRATION *1 LOWER NO. 2 STEERING WHEEL COVER *2 LOWER NO. 3 STEERING WHEEL COVER *3 STEERING PAD - - N*m (kgf*cm, ft.*lbf): Specified torque - ...

All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch or Door Key Cylinder
DESCRIPTION The main body ECU (multiplex network body ECU) receives switch signals from the power window regulator master switch assembly and driver door key cylinder lock or unlock switch signals from the front door lock assembly. The main body ECU (multiplex network body ECU) activates the ...