System Tests: Notes

2004 Toyota Celica GT, StandardSECTION Notes
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
ANTI-THEFT SYMPTOM INDEX

Symptom Suspected Area
Anti-Theft System Cannot Be Set (1) Indicator Light Circuit, (2) ECU Power Source Circuit, (3) Key Unlock Warning Switch Circuit, (4) Luggage Compartment Door Key Lock & Unlock Switch Circuit & Engine Hood Courtesy Switch Circuit
Indicator Light Does Not Blink When System Is Set (1) Indicator Light Circuit
When System Is Set (System Does Not Operate When Engine Hood Is Opened) Engine Hood Courtesy Switch Circuit
When System Is Set (It Is Not Canceled When Ignition Key Is Turned To ACC Or ON Position) Ignition Switch Circuit
When System Is Set (It Is Still Operating When Luggage Compartment Door Is Opened With Key) (4) Luggage Compartment Door Key Lock & Unlock Switch Circuit
While System Is In Warning Operation (Horns Do Not Sound) (5) Horn Circuit
Even When System Is Not Set (Horns Sound) (5) Horn Circuit
(1) See INDICATOR LIGHT CIRCUITΒ  under SYSTEM TESTS.
(2) See ECU POWER SOURCE CIRCUITΒ  under SYSTEM.
(3) See UNLOCK WARNING SWITCH CIRCUIT (KEY UNLOCK WARNING SYSTEM) in POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE - ES 300 article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT.
(4) See LUGGAGE COMPARTMENT DOOR LOCK CIRCUIT in POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE - ES 300 article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT.
(5) See ANTI-THEFT HORN CIRCUITΒ  under SYSTEM TESTS.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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