Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

  • Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Headlight and taillight system

Symptom

Suspected Area

See page

"Low beam" does not turn on (One side)

Headlight bulb (Low)

-

Headlight Assembly

Harness or connector

-

"Low beam" does not turn on (Both sides)

Low beam headlight circuit

Harness or connector

-

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

"High beam" does not turn on (One side)

Headlight bulb (High)

-

Headlight Assembly

Harness or connector

-

"High beam" does not turn on (Both sides)

High beam headlight circuit

Harness or connector

-

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

"Flash" does not turn on (Low beam and Hi-beam are normal)

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Headlight is dark

Headlight bulb

-

Taillight does not turn on (All)

Headlight dimmer switch circuit

Taillight relay circuit

Main body ECU (Multiplex network body ECU)

Only one taillight turns on

Rear combination light assembly

Tail and stop light bulb

-

Daytime running light system does not operate (Turn signal light normal) [w/ Daytime Running Light Halogen Type]

Headlight dimmer switch circuit

CAN communication system

Parking brake switch assembly

Daytime running light relay circuit

Main body ECU (Multiplex network body ECU)

Combination meter assembly

Daytime running light system does not operate (Turn signal light normal) [w/ Daytime Running Light LED Type]

Headlight dimmer switch circuit

Parking brake switch assembly

Daytime running light relay circuit

Main body ECU (Multiplex network body ECU)

Automatic High Beam System (w/ Automatic High Beam System)

Symptom

Suspected Area

Link

Automatic high beam system does not operate or operation indicator does not illuminate.

Check automatic high beam indicator light

Check Data List (Auto H Beam STS)

Check Active Test (Automatic High Beam Indicator)

Check automatic high beam main switch

Harness or connector

Light auto turn off system

Symptom

Suspected Area

See page

Light auto turn off system does not operate

Headlight dimmer switch circuit

Ignition switch (w/o Smart key system)

-

Engine switch (w/ Smart key system)

-

Door courtesy switch circuit

Main body ECU (Multiplex network body ECU)

Front fog light system (w/ Fog Light)

Symptom

Suspected Area

See page

Front fog light does not turn on (All)

Headlight dimmer switch circuit

Front fog light circuit

Main body ECU (Multiplex network body ECU)

Only one front fog light does not turn on

Front fog light bulb

-

Turn signal and hazard warning system

Symptom

Suspected Area

See page

"Hazard" and "Turn" do not turn on

Combination meter assembly

Harness or connector

-

Hazard warning light does not turn on

Hazard warning switch circuit

Harness or connector

-

Combination meter assembly

Turn signal does not turn on

Meter/gauge system

Headlight dimmer switch circuit

Combination meter assembly

Stop light system

Symptom

Suspected Area

See page

Stop light does not operate (All)

Stop light switch assembly

Harness or connector

-

Rear combination light assembly

Only one stop light does not operate

Rear combination light assembly

Center stop light does not operate

Center stop light assembly

Stop light switch assembly

Harness or connector

-

Illuminated entry system

Symptom

Suspected Area

See page

Illuminated entry does not operate (All)

Door courtesy switch circuit

Interior light circuit

Main body ECU (Multiplex network body ECU)

Others

Symptom

Suspected Area

See page

*1: for 2WD

*2: for 4WD

Back-up light does not operate (All)

Park/neutral position switch*1

Park/neutral position switch*2

Harness or connector

-

Rear combination light assembly

Only one back-up light does not operate

Rear combination light assembly

Vanity light does not operate

Vanity light

Harness or connector

-

Cargo light does not operate

Center stop light assembly

Cargo light circuit

Harness or connector

-

Main body ECU (Multiplex network body ECU)

Room light does not operate

Roof console box assembly

Harness or connector

-

Battery saving control system

Symptom

Suspected Area

See page

Battery saving function (interior light auto cut function) does not operate

Interior light auto cut circuit

Main body ECU (Multiplex network body ECU)

Harness or connector

-

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Main Body / Tr ...

Terminals Of Ecu
TERMINALS OF ECU 1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Text in Illustration *1 Main Body ECU (Multiplex Network Body ECU) - - (a ...

Other materials:

Test Mode Procedure
TEST MODE PROCEDURE 1. TEST MODE PROCEDURE (for Using Techstream) HINT: If the ignition switch is turned from the ON to the ACC or LOCK position during test mode, DTCs related to the signal check function will be cleared. During test mode, the skid control ECU (master cylinder ...

System Description
SYSTEM DESCRIPTION 1. WIRELESS DOOR LOCK CONTROL SYSTEM The wireless door lock control system can be used to lock and unlock all doors from a distance. The system is controlled by an electrical key transmitter sub-assembly which sends radio waves to the door control receiver. The certification ...

Accelerator Pedal
Components COMPONENTS ILLUSTRATION On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT ACCELERATOR PEDAL SENSOR ASSEMBLY (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / En ...

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