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 MANUALSAUDI1998A4 AVANT QUATTRO, AUTOMATICREPAIR AND DIAGNOSISBODY & FRAMEPOWER WINDOWSSYSTEM TESTSPOWER WINDOW/SUN ROOF CONTROL MODULE

1998 Audi A4 Avant Quattro, Automatic

Power Window/Sun Roof Control Module

1998 Audi A4 Avant Quattro, AutomaticSECTION Power Window/Sun Roof Control Module

NOTE: Ensure driver's window switch is functioning properly. See WINDOW SWITCHES under COMPONENT TESTS.

Turn ignition switch off. Remove control module from auxiliary relay panel, located behind left side kick panel. Measure voltage between ground and terminal No. 2 at relay socket "A". See Fig 1 . If battery voltage exists, go to next step. If battery voltage does not exist, repair wiring. See WIRING DIAGRAMS.
Turn ignition switch to RUN position. Measure voltage between ground and terminal No. 7 at relay socket "A". If battery voltage exists, go to next step. If battery voltage does not exist, repair wiring. See WIRING DIAGRAMS.
Measure voltage between ground and terminal No. 1 at relay socket "A". If battery voltage exists, go to next step. If battery voltage does not exist, repair wiring. See WIRING DIAGRAMS.
Check resistance between ground and terminal No. 5 at relay socket "B". Continuity should exist with driver's door open and should not exist with driver's door closed. If continuity is as specified, replace power window/sun roof control module. If continuity is not as specified, check door switch. If door switch is okay, repair wiring. See WIRING DIAGRAMS.

Fig 1: Identifying Power Window/Sun Roof Control Module Relay Sockets & Terminals

Courtesy of AUDI OF AMERICA, INC.

RENDER: 1.0x

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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.