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.
Symptom | Suspected Area | See page |
|---|---|---|
Theft deterrent system cannot be set |
Smart key system (for Entry Function)*1 |
.gif) |
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
Test yourself
A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.