Toyota Avalon Service & Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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HINT:

  • Troubleshooting of the theft deterrent system is based on the premise that the power door lock control system and the wireless door lock control system are operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that the power door lock control system and the wireless door lock control system are operating normally.
  • 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.
Theft Deterrent System

Symptom

Suspected Area

Link

Theft deterrent system cannot be set

Refer to "Security Indicator Light Does not Blink"

Refer to "Front Door Courtesy Switch Circuit"

Refer to "Rear Door Courtesy Switch Circuit"

Refer to "Luggage Compartment Door Courtesy Switch Circuit"

Front door lock with motor assembly

Rear door lock with motor assembly

Luggage compartment door lock assembly

Refer to "Engine Hood Courtesy Switch Circuit"

Security indicator light does not blink when theft deterrent system is set

Refer to "Security Indicator Light Does not Blink"

Alarm sounding state cannot be canceled when power switch is turned on (IG)

Refer to "Smart Key System (for Start Function)"

Certification ECU (Smart key ECU assembly)

-

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

Theft deterrent system can be set even when door is open

Refer to "Front Door Courtesy Switch Circuit"

Refer to "Rear Door Courtesy Switch Circuit"

Refer to "Luggage Compartment Door Courtesy Switch Circuit"

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

Theft deterrent system can be set even when engine hood is open

Refer to "Engine Hood Courtesy Switch Circuit"

Vehicle horns do not sound while theft deterrent system is in alarm sounding state

Refer to "Horn Circuit"

Low beams do not blink while theft deterrent system is in alarm sounding state

Refer to "LIGHTING SYSTEM"*1

Refer to "LO-beam Headlight does not Illuminate"*2

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

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

Refer to "Taillight Relay Circuit"*1

Refer to "Taillight Relay Circuit"*2

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

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

Combination meter assembly

-

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

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

Refer to "Interior Light Circuit"

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

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

Refer to "Security Horn Circuit"

Low beams blink even when theft deterrent system is not set

Refer to "LIGHTING SYSTEM"*1

Refer to "LO-beam Headlight does not Illuminate"*2

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

Taillights blink even when theft deterrent system is not set

Refer to "Taillight Relay Circuit"*1

Refer to "Taillight Relay Circuit"*2

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

Hazard warning lights flash even when theft deterrent system is not set

Combination meter assembly

-

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

Interiors light comes on even when theft deterrent system is not set

Refer to "Interior Light Circuit"

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

The vehicle does not enter the alarm sounding state as the auxiliary battery is reconnected

Check the auxiliary battery

Refer to "Power Source Circuit"

  • *1: w/ Cornering Light
  • *2: w/o Cornering Light
    Precaution

    Security Horn Circuit

    See More:

    Toyota Avalon Service & Repair Manual > Theft Deterrent System(for Gasoline Model): Improper Operation
    DESCRIPTION If the alarm function of the theft deterrent system operates unintentionally, one of the following may be the cause. Short to ground in any door courtesy light switch circuit or the engine hood courtesy switch (hood lock assembly) circuit. Unstable main body ECU (multiplex network body E ...

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