Toyota 4Runner manuals

Toyota 4Runner: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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.
  • The troubleshooting procedures for the theft deterrent system are based on the premise that the door lock control system, wireless door lock control system, lighting system, horn system, engine immobiliser system and smart key system (w/ Smart Key System) are operating normally. Check these systems first before troubleshooting the theft deterrent system.
Theft Deterrent System

Symptom

Suspected Area

See page

Theft deterrent system cannot be set

Smart key system (for Entry Function)*1


Key reminder warning system*2


Door courtesy switch circuit


Back door courtesy switch circuit


Engine hood courtesy switch circuit


Replace main body ECU


Security indicator is not blinking when theft deterrent system is set

Security indicator light circuit


Replace main body ECU


Theft deterrent system can be set even when any door is open

Door courtesy switch circuit


Back door courtesy switch circuit


Engine hood courtesy switch circuit


Replace main body ECU


Vehicle horn(s) do not sound while theft deterrent system is in alarm sounding state

Horn circuit


Replace main body ECU


Security horn does not sound while theft deterrent system is in alarm sounding state

Security horn circuit


Replace main body ECU


Hazard warning lights do not flash while theft deterrent system is in alarm sounding state

Lighting system


Replace main body ECU


Headlights do not flash while theft deterrent system is in alarm sounding state

Headlight relay circuit


Replace main body ECU


Taillights do not flash while theft deterrent system is in alarm sounding state

Taillight relay circuit


Replace main body ECU


Interior light does not illuminate while theft deterrent system is in alarm sounding state

Illumination circuit


Replace main body ECU


  • *1: w/ Smart Key System
  • *2: w/o Smart Key System
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the theft deterrent system. *: Use the Techstream. The troubleshooting procedures for the theft deterrent system ...

Terminals Of Ecu
TERMINALS OF ECU 1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Remove the main body ECU (multiplex network body ECU) (See page ). (b) Measure ...

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