A4 Rear ABS Light Power

- Check for voltage to REAR ABS light:

- Set voltmeter on 20 VDC scale position.

- Turn ignition to the ON position.

- Check voltage between harness connector Pin 7 and a known good chassis ground.

- Are 9 volts present?

YES -- Replace antilock electronic control unit. Repeat System Pre-Check. Initial Inspection and Diagnostic Overview

NO -- Go to A5. [1][2]A5 - Power to Rear ABS Light Fuse