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