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 DIAGNOSISWINDOWS AND GLASSHEATED GLASS ELEMENTTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESREAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Rear Window Defogger System Does Not Operate
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Rear Window Defogger System Does Not Operate
Rear Window Defogger System does not Operate
DESCRIPTION
- The rear defogger & mirror heater switch on the multi-display inputs a request signal to the A/C amplifier (ECU). Then, the A/C amplifier turns ON the RR-DEF relay built into the power distributor response to the input, thus switching ON the rear defogger. (The deicer and mirror heater also turn at the same time)
HINT: The power distributor is built into the J/B No.2.
- The RR-DEF relay is built into the J/B No.2. For inspection, use the terminals in the J/B No.2.
- If RR-DEF relay is malfunctioning , replace the J/B No.2.
INSPECTION PROCEDURE
DESCRIPTION
- The rear defogger & mirror heater switch on the multi-display inputs a request signal to the A/C amplifier (ECU). Then, the A/C amplifier turns ON the RR-DEF relay built into the power distributor response to the input, thus switching ON the rear defogger. (The deicer and mirror heater also turn at the same time)
HINT: The power distributor is built into the J/B No.2.
- The RR-DEF relay is built into the J/B No.2. For inspection, use the terminals in the J/B No.2.
- If RR-DEF relay is malfunctioning , replace the J/B No.2.
Wiring Diagram:
Step 1-4:
Step 4(continued)-5:
Step 6-7:
Step 7(continued)-8:
Step 9-10:
Step 10(continued)-11:
Step 11(continued)-13:
Step 13(continued):
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.