Toyota CH-R Service Manual: Problem Symptoms Table

Toyota CH-R Service Manual / Theft Deterrent / Keyless Entry / Theft Deterrent System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

  • Before replacing the main body ECU (multiplex network body ECU), refer to REGISTRATION*1.

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    *1: w/ Smart Key System

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

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

Immobiliser system (w/ Smart Key System)" security indicator light does not blink"

Immobiliser system (w/o Smart Key System)" security indicator light does not blink"

ACC signal circuit

IG signal circuit

Door unlock detection switch circuit

Door courtesy switch circuit

Back door courtesy switch circuit

Engine hood courtesy switch circuit

Unlock warning switch circuit (w/o Smart Key System)

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 indicator light does not blink when theft deterrent system is set

Immobiliser system (w/ Smart Key System)" security indicator light does not blink"

Immobiliser system (w/o Smart Key System)" security indicator light does not blink"

Theft deterrent system cannot be unset by turning the engine on.

Replace the main body ECU (multiplex network body ECU)

Theft deterrent system can be set even when door is open

Door courtesy switch circuit

Back door courtesy switch 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)

Theft deterrent system can be set even when hood is open

Engine hood courtesy switch circuit

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

Horn circuit

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)

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

Security horn circuit

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)

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

Check the battery

Power Source Circuit

The warning sounds itself

Improper Operation

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