Problem Symptoms Table
WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
Proceed to the reference shown in the table below for each malfunction symptom and troubleshoot each circuit.
HINT:
Troubleshooting of the theft deterrent system is based on the premise that the 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 door lock control system and the wireless door lock control system are operating normally.
Theft deterrent system:
THEFT DETERRENT SYSTEM
| Symptom | Suspected area | Information |
|---|---|---|
| Theft deterrent system cannot be set | Security indicator light circuit | SECURITY INDICATOR LIGHT CIRCUIT |
| ECU power source circuit | ECU POWER SOURCE CIRCUIT | |
| Unlock warning switch circuit | UNLOCK WARNING SWITCH CIRCUIT | |
| Door key lock and unlock switch | FRONT DOOR LOCK | |
| Door courtesy switch circuit | DOOR COURTESY SWITCH CIRCUIT | |
| Engine hood courtesy switch circuit | ENGINE HOOD COURTESY SWITCH CIRCUIT | |
| Multiplex network body ECU | - | |
| Security indicator does not blink when theft deterrent system is set | Security indicator light circuit | SECURITY INDICATOR LIGHT CIRCUIT |
| Multiplex network body ECU | - | |
| Alarm sounding state cannot be canceled | Ignition switch circuit | IGNITION SWITCH CIRCUIT |
| Unlock warning switch circuit | UNLOCK WARNING SWITCH CIRCUIT | |
| Multiplex network body ECU | - | |
| Theft deterrent system can be set even when a door is open | Door courtesy switch circuit | DOOR COURTESY SWITCH CIRCUIT |
| Multiplex network body ECU | - | |
| Vehicle horns (low pitched, high pitched) do not sound while theft deterrent system is in warning operation | Horn system | PROBLEM SYMPTOMS TABLE |
| Multiplex network body ECU | - | |
| Headlights do not flash while theft deterrent system is in warning operation | Headlight relay circuit | HEADLIGHT RELAY CIRCUIT |
| Multiplex network body ECU | - | |
| Taillights do not flash while theft deterrent system is in warning operation | Taillight relay circuit | TAILLIGHT RELAY CIRCUIT |
| Multiplex network body ECU | - | |
| Hazard warning lights do not flash while theft deterrent system is in warning operation | Hazard warning switch | HAZARD WARNING SWITCH |
| Wire harness | - | |
| Multiplex network body ECU | - | |
| Interior light does not light up while theft deterrent system is in warning operation | Interior light circuit | OVERHEAD CONSOLE ILLUMINATION LIGHT CIRCUIT |
| Multiplex network body ECU | - | |
| Security horn does not sound while theft deterrent system is in warning operation | Security horn circuit | SECURITY HORN CIRCUIT |
| Multiplex network body ECU | - | |
| Headlights flash even when theft deterrent system is not set | Headlight relay circuit | HEADLIGHT RELAY CIRCUIT |
| Multiplex network body ECU | - | |
| Taillights flash even when theft deterrent system is not set | Taillight relay circuit | TAILLIGHT RELAY CIRCUIT |
| Multiplex network body ECU | - | |
| Hazard warning lights flash even when theft deterrent system is not set | Hazard warning switch | HAZARD WARNING SWITCH |
| Wire harness | - | |
| Multiplex network body ECU | - | |
| Interior light comes on even when theft deterrent system is not set | Interior light circuit | OVERHEAD CONSOLE ILLUMINATION LIGHT CIRCUIT |
| Multiplex network body ECU | - |