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Home >> Volvo >> 1988 >> 780 AW71 >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Anti-Lock Brake System >> Testing >> Circuit Tests >> Hydraulic Modulator Power Circuits

Hydraulic Modulator Power Circuits

  1. Turn ignition switch to the "OFF" position. Disconnect hydraulic modulator connector. Turn ignition switch to the "ON" position.
  2. Connect negative lead of DVOM to a good ground. Connect positive lead of DVOM to terminals No. 6, 7, 10 and 12 of hydraulic modulator connector. If there is no voltage present at :
    • 6 - Check wire harness and fuse.
    • 7 - Attach connector to hydraulic modulator. ABS warning light should illuminate on dashboard. If light does not illuminate, replace bulb.
    • 10 - Check transient surge protector fuse. If fuse is okay, replace transient surge protector.
    • 12 - Check 80-amp fuse on top of right front wheelwell.
  3. Turn ignition switch to the "OFF" position. Attach connector to modulator.
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