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Pump Motor Relay

WARNING: This page is about a different car, the 1989 Volvo 760 and 1989 Volvo 740. However, it is still accessible from the selected car via links, so may be relevant.
  1. With ECU connector still unplugged, turn ignition on. Connect a jumper wire between terminal No. 28 of ECU connector and ground.
    NOTE: Relay should NOT remain grounded for more than 2 seconds or damage to relay may occur.
  2. Hydraulic modulator should operate while jumper wire is installed. If hydraulic modulator does not function, check wiring from ECU connector to modulator. If wiring is not at fault, substitute a good relay and retest.
Fig 1: ABS Hydraulic Modulator Assembly
G58303Courtesy of VOLVO CARS OF NORTH AMERICA.
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