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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGTEST NO. 1POWER SUPPLY CIRCUITRY
1996 Audi A4 Base, Standard

Power Supply Circuitry

1996 Audi A4 Base, StandardSECTION Power Supply Circuitry
  1. Disconnect electrical connector at ABS control unit. Install ABS tester in series with ABS control unit and ABS control unit harness connector. Place program switch in position "1", and turn ignition on. See Figure . Battery LED must light and stay illuminated during all tests. All 7 test LEDs must light (Green). See Fig 1 . If all 7 LEDs light, TEST NO. 1 is complete. Go to TEST NO. 2. If battery LED does not light, go to next step. If test LED No. 1 or 2 does not illuminate, go to step 5). If test LEDs No. 3-7 all do not illuminate, go to step 8). If test LED No. 3 does not illuminate, go to step 6). If test LED No. 4 does not illuminate, go to step 10). If test LED No. 5 does not illuminate, go to step 11). If test LED No. 6 does not illuminate, go to step 12). If test LED No. 7 does not illuminate, go to step 13).
    Fig 1: Identifying ABS Tester (VAG 1710) LEDs
    G91D02086Courtesy of AUDI OF AMERICA, INC.
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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.