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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICTESTINGFRESH AIR BLOWER & FRESH AIR BLOWER CONTROL MODULE
1996 Audi A4 Base, Standard

Fresh Air Blower & Fresh Air Blower Control Module

1996 Audi A4 Base, StandardSECTION Fresh Air Blower & Fresh Air Blower Control Module
  1. Put DVOM in 20-volt range. Using Adapter Cable (VAG 1598/11), use DVOM to check voltage between Test Box (VAG 1598) terminal No. 16 and ground. Turn ignition on. If reading is not less than 5 volts or blower runs, check for short to power in Green/Black wire between fresh air blower control module and A/C-heater control panel. Check fresh air blower control module. Repair or replace as necessary.
  2. Check voltage between test box terminal No. 14 and ground. Turn ignition on. If about battery voltage does not exist, check Black/Blue wire between A/C-heater control panel and fresh air blower. Repair as necessary.
  3. Check voltage between test box terminal No. 11 and ground. Turn ignition on. If about battery voltage does not exist, check Brown/Green wire between fresh air blower control module and fresh air blower. Repair as necessary.
  4. Check voltage between test box terminals No. 13 and 16. Turn ignition on. Using LED Tester (US 1115), ensure LED in tester comes on and fresh air blower runs. If LED in tester does not come on or fresh air blower does not run, check for open in Brown/Green or Green/Black wire between fresh air blower control module and A/C-heater control panel. Ensure fresh air blower operates freely. Repair or replace as necessary.
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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.