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Home >> Volvo >> 1990 >> 740 Base, 4D Sedan, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Circuit Tests >> Hydraulic Modulator Power Circuits

Hydraulic Modulator Power Circuits

  1. Turn ignition off. Disconnect hydraulic modulator connector. Turn ignition on.
  2. Connect DVOM negative lead to ground and positive lead to hydraulic modulator connector terminals No. 6, No. 7, No. 10 and No. 12. DVOM should indicate battery voltage. If battery voltage is not present, perform following repair:
    • No. 6 - Check wire harness and fuses.
    • No. 7 - Attach connector to hydraulic modulator. ABS warning light should illuminate on dashboard. If light does not illuminate, replace bulb.
    • No. 10 - Check transient surge protector fuse. If fuse is okay, replace transient surge protector.
    • No. 12 - Check wire harness and 80-amp fuse on top of right front wheelwell.
  3. Turn ignition switch off. Attach connector to modulator.
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