Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2006RX 400H AWD V6-3.3L (3MZ-FE) HYBRIDREPAIR AND DIAGNOSISBODY AND FRAMELOCKSPOWER LOCKSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSDOOR CONTROL SWITCH CIRCUIT
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Door Control Switch Circuit
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Door Control Switch Circuit
Door Control Switch Circuit
DESCRIPTION
When the lock side of the door control switch is pressed, continuity is established between terminals 3 and 2 of the switch. When the unlock side of the switch is pressed, continuity is established between terminals 1 and 2.
Terminals L1 and UL1 of the body ECU are connected to the door control switch and door lock/unlock request signals (by door control switch operation) are input to the ECU.
The body ECU constantly applies voltage to terminal 3 of the door control switch via terminal L1. When the door control switch is operated to lock all doors, current flows from terminal L1 to terminal 3. The body ECU determines that this is door lock request signal input.
The body ECU also applies constant voltage to terminal 1 of the door control switch via terminal UL1. When the door control switch is operated to unlock the doors, current flows from terminal UL1 to terminal 1.The body ECU determines that this is door unlock request signal input.
INSPECTION PROCEDURE
DESCRIPTION
When the lock side of the door control switch is pressed, continuity is established between terminals 3 and 2 of the switch. When the unlock side of the switch is pressed, continuity is established between terminals 1 and 2.
Terminals L1 and UL1 of the body ECU are connected to the door control switch and door lock/unlock request signals (by door control switch operation) are input to the ECU.
The body ECU constantly applies voltage to terminal 3 of the door control switch via terminal L1. When the door control switch is operated to lock all doors, current flows from terminal L1 to terminal 3. The body ECU determines that this is door lock request signal input.
The body ECU also applies constant voltage to terminal 1 of the door control switch via terminal UL1. When the door control switch is operated to unlock the doors, current flows from terminal UL1 to terminal 1.The body ECU determines that this is door unlock request signal input.
Wiring Diagram:
Step 1:
Step 1(continued)-2:
Step 3:
INSPECTION PROCEDURE
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.