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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

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.

(c) Turn the Techstream 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

B

GO TO OTHER DTC CHART

A

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

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

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:

SRS airbag instructions for Canadian owners (in French)
The following is a French explanation of SRS airbag instructions extracted from the SRS airbag section in this manual. See the SRS airbag section for more detailed SRS airbag instructions in English. ...

Precaution
PRECAUTION 1. IGNITION SWITCH EXPRESSIONS (a) The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (Position) Engine ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the vehicle's skid control ECU (brake actuator assembly) ...

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