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Theft Deterrent System

WARNING: This page is about a different car, the 2004 Lexus GS 430 and 2004 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - THEFT DETERRENT SYSTEM

Symptom Suspect Area
No alerting condition is operated. (The system cannot be set.)
  1. Theft deterrent indicator circuit
  2. Key unlock warning switch circuit
  3. Courtesy switch circuit
  4. Door unlock detection switch circuit
  5. Engine hood courtesy switch circuit
  6. Luggage room door courtesy switch circuit
  7. Any door ECU
  8. Body ECU No. 2
  9. Body ECU No. 1
Cannot be canceled when IG is ON with a key.
  1. Key unlock warning switch circuit
  2. Ignition switch circuit
  3. Body ECU No. 2
  4. Body ECU No. 1
Cannot be canceled when unlocking the luggage compartment door with a key.
  1. Luggage room courtesy switch circuit
  2. Body ECU No. 1
Some of the system does not operate. (Headlight does not light up.)
  1. Headlight relay circuit
  2. Body ECU No. 2
  3. Body ECU No. 1
Some of the system does not operate. (Taillight does not light up.)
  1. Taillight relay circuit
  2. Body ECU No. 2
  3. Body ECU No. 1
Some of the system does not operate. (Hazard does not light up.)
  1. Hazard switch circuit
  2. Body ECU No. 1
Theft deterrent horn or horn does not sound
  1. Theft deterrent horn circuit
  2. Horn circuit
  3. Body ECU No. 1
During warning condition, cannot be canceled by unlocking the door with a key.
  1. Door key lock and unlock switch circuit
  2. Driver Door ECU (or Passenger Door ECU)
  3. Body ECU No. 1
During warning condition, cannot be canceled by unlocking the door with a key. (transmitter)
  1. Transmitter
  2. Wireless tuner circuit
  3. Body ECU No. 1
During warning condition, cannot be cancelled by turning the ACC or ON with a key.
  1. Ignition switch
  2. Key unlock warning switch circuit
  3. Body ECU No. 2
  4. Body ECU No. 1
The system operated for more 60 records.
  1. Body ECU No. 1
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