Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Taillight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page ).*1
    • *1: w/ Smart Key System

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (TAILLIGHT RELAY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Taillight Relay

Taillight relay

ON/OFF

-

OK:

Taillight relay operates. (Taillights illuminate.)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (BATTERY - DRIVER SIDE JUNCTION BLOCK)

(a) Disconnect the 1K driver side junction block connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

1K-1 - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block (See page (b) Remove the main body ECU (multiplex network body ECU) from the driver side ).

(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block.

Text in Illustration

*a

Component without harness connected

(Driver Side Junction Block)

-

-

(c) Connect a positive (+) lead from the battery to terminal 1K-1.

(d) Connect a negative (-) lead from the battery to terminal MB-14 (TRLY).

(e) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

1F-3 - Battery negative terminal

Always

11 to 14 V

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK

Engine Switch Illumination Circuit
DESCRIPTION The illuminated entry system controls the engine switch illumination. WIRING DIAGRAM PROCEDURE 1. READ VALUE USING TECHSTREAM (POWER/ENGINE SW LIGHT) ...

Cargo Light Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) receives a cargo light information signal from the deck light switch assembly and door courtesy light switch, and illuminates the cargo ...

Other materials:

Acceleration Sensor Power Supply Voltage Malfunction (C1381)
DESCRIPTION The skid control ECU (master cylinder solenoid) receives signals from the yaw rate and acceleration (airbag sensor assembly) via the CAN communication system. The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 ...

Brake Booster Pump Motor on Time Abnormally Long (C1252)
DESCRIPTION The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU (master cylinder solenoid). DTC No. DTC Detecting Condition Trouble Areas C1252 ...

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT FLUID LEVEL IN RESERVOIR (a) Check the fluid level. If the brake fluid level is lower than the MIN line, check for leaks and inspect the disc brake pads. If necessary, refill the reservoir with brake fluid to the MAX line after repair or replaceme ...

В© 2011-2020 Copyright www.ttguide.net