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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGTEST NO. 2ALTERNATOR & BRAKELIGHT
1996 Audi A4 Base, Standard

Alternator & Brakelight

1996 Audi A4 Base, StandardSECTION Alternator & Brakelight
  1. Place ABS tester program switch in position "2". See Figure . Turn ignition on. Both LEDs should illuminate if circuits are okay. If LED "G" (alternator) does not light, repair open Blue wire between terminal No. 61 on back of alternator and terminal No. 15 of ABS control unit connector. See wiring diagram under WIRING DIAGRAMS  . If LED "G" does not go out when engine is started, check alternator output.
  2. If brake LED does not illuminate, repair open Red/Black wire between brakelight switch terminal and terminal No. 25 on ABS control unit connector. See wiring diagram under WIRING DIAGRAMS  . If wiring is okay, check for short circuit in brakelight switch. Brake LED should go out when brake pedal is depressed. If LED does not go out, check brakelight switch for correct adjustment and mechanical function. If adjustment is okay, replace brakelight switch.
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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.