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.
1987 Audi 5000 CS, StandardFACTORY OEM SERVICE PROCEDURE
All Models
- Item Being Tested - Anti-Lock Power Supply Relay Place ABS tester in program switch position No. 5. Turn ignition off. Disconnect plug for anti-lock brake tester from ABS control unit.
- Remove anti-lock power supply relay from auxiliary relay panel. Use ABS tester adapter to connect anti-lock power supply relay from vehicle to back of ABS tester. See Figure .
- Install a new Anti-Lock Power Supply Relay (443 927 826) in auxiliary relay panel. Turn ignition on. When button No. 5 lights up, press button.
- Lamps No. 1 and 3 (Green) must come on. If lamps come on, TEST 5 is completed. If lamp No. 4 (Red) comes on, repeat steps 1) through 3). If lamp No. 4 comes on again, replace anti-lock power supply relay.
Factory Service Tools
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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.