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Problem Symptoms Table

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Proceed to the reference page shown in the matrix chart below for each malfunction symptom and troubleshoot for each circuit.

HINT:

Troubleshooting of the theft deterrent system is based on the premise that the door lock control system is operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that the door lock control system is operating normally.

PROBLEM SYMPTOMS TABLE - THEFT DETERRENT SYSTEM

Symptom Suspected Area
Theft deterrent system is not set.
  1. Security indicator circuit
  2. Key unlock warning switch circuit
  3. Door courtesy switch circuit
  4. Door unlock detection switch circuit
  5. Engine hood courtesy switch circuit
  6. Power source circuit
  7. Theft deterrent ECU
Security indicator does not come on or blink.
  1. Security indicator circuit
  2. Theft deterrent ECU
Theft deterrent system cannot be unset even if ignition switch is ON.
  1. Key unlock warning switch circuit
  2. Power source circuit
  3. Theft deterrent ECU
During warning condition, horn does not operate.
  1. Horn circuit
  2. Theft deterrent ECU
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