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 MANUALSTOYOTA2007HIGHLANDER 2WD V6-3.3L (3MZ-FE)REPAIR AND DIAGNOSISWINDOWS AND GLASSHEATED GLASS ELEMENTTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESREAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE
2007 Toyota Highlander 2WD V6-3.3L (3MZ-FE)
Rear Window Defogger System Does Not Operate
2007 Toyota Highlander 2WD V6-3.3L (3MZ-FE)SECTION 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 in response to the input, thus switching ON the rear defogger. (The deicer and mirror heater also turn ON 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
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 in response to the input, thus switching ON the rear defogger. (The deicer and mirror heater also turn ON 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
Wiring Diagram:
INSPECTION PROCEDURE
Step 1 - 4:
Step 5 - 6:
Step 7 - 8:
Step 9 - 10:
Step 10(Continued):
Step 11:
Step 12 - 13:
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.