Theft Deterrent System:
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
THEFT DETERRENT SYSTEM
| Symptom | Suspect Area | See Section |
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| Theft deterrent system is not set. | Security indicator circuit | SECURITY INDICATOR CIRCUIT |
| Key unlock warning switch circuit | DTC B2780 KEY UNLOCK WARNING SWITCH MALFUNCTION | |
Door courtesy switch circuit
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Door unlock detection switch circuit
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| Engine hood courtesy switch circuit | ENGINE HOOD COURTESY SWITCH CIRCUIT | |
| Luggage compartment door courtesy switch circuit | LUGGAGE COMPARTMENT DOOR COURTESY SWITCH CIRCUIT | |
| Power source circuit | POWER SOURCE CIRCUIT | |
| Any door ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| Driver side J/B ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| Luggage room J/B ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| Theft deterrent ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| Theft deterrent system cannot be unset even if ignition switch is ON. |
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| Theft deterrent system cannot be unset even if door is unlocked with key. | Door key lock and unlock switch circuit | DTC B1221 POWER WINDOW SWITCH CIRCUIT ON DRIVER, DTC B1222 DOOR LOCK SWITCH CIRCUIT ON DRIVER DOOR |
Door unlock detection switch circuit
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| Driver door ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| Theft deterrent ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| Theft deterrent system cannot be unset even if luggage is opened with key. |
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| Security indicator does not light up or blink. |
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| During warning condition, headlight does not operate. |
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| During warning condition, taillight does not operate. |
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| During warning condition, theft deterrent horn does not operate. |
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| During warning condition, hazard warning light does not operate. |
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| During warning condition, horn does not operate. |
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| During warning condition, warning does not stop even if door is unlocked with key. | Door key lock and unlock switch circuit | DOOR UNLOCK DETECTION SWITCH CIRCUIT |
Door unlock detection switch circuit
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| Driver door ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| Theft deterrent ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| During warning condition, warning does not stop even if door is unlocked with transmitter. | Transmitter | INSPECTION |
Door unlock detection switch circuit
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| Wireless tuner circuit (inner mirror) | WIRELESS DOOR LOCK TUNER (INNER MIRROR) | |
| Theft deterrent ECU | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE | |
| During warning condition, warning does not stop even if ignition switch is turned to ACC or ON. |
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