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 MANUALSAUDI2004A4 BASE, 4D SEDAN, 3.0 TREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSON BOARD DIAGNOSTIC (OBD)AUTOMATIC CLIMATE CONTROL SYSTEM, ELECTRICAL TESTINGCOMPONENTS ACTIVATED BY A/C CONTROL HEAD -E87-, ELECTRICAL TESTINGHEATED REAR WINDOW -Z1-, TESTING
2004 Audi A4 Base, 4D Sedan, 3.0 T
Heated rear window -Z1-, testing
2004 Audi A4 Base, 4D Sedan, 3.0 TSECTION Heated rear window -Z1-, testing
NOTE:
- If a condition exists which disables the heated rear window to be switched on (short circuit in wiring to rear window, open circuit in voltage supply to A/C control head -E87- or the an open top on convertible) the indicator light in the button of the A/C control head -E87- illuminates when pressing the button, and goes out after button has been released, the heated rear window however is not switched on.
- If voltage on terminal "30" measured by the A/C control head -E87- drops below 12.5 volt, the performance of the heated rear window is reduced and the generator load is reduced (the electronic of the A/C control head -E87- reduces the activation from 100% to 90% - 10%).
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.