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.
2008 Subaru Outback Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Heat Wire Inspection
CAUTION:
Use a dry and soft cloth when wiping dirt off the glass. Move the cloth along the heat wire to avoid damaging it.
- Turn the ignition switch to ON.
- Turn the defogger switch to ON.
- Wrap the tips of tester probe with aluminum foil to avoid damage to heat wire.
- Measure the voltage at heat wire center with DC voltmeter.
Standard voltage: Approx. 6 V
RESISTANCE SPECIFICATION CHARTVoltage Criteria Approx. 6 V Normal operation Approx. 12 V or 0 V Open NOTE:- If the measured value is 12 volts, heat wire is open between heat wire center and positive (+) terminal of tester probe.
- If it is 0 V, the circuit is open between heat wire center and ground.
- Connect the tester probe of positive lead of voltmeter to positive terminal of heat wire and move tester probe of negative lead along the heat wire up to the negative terminal end. If voltage changes from zero to several volts during movement of tester probe, heat wire is open at the voltage change point.
Factory Service Tools
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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.