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Motor Relay

  1. Check if hydraulic unit motor makes noise (still operating) when vehicle speed is more than 4 MPH. If motor is not operating, go to next step. If motor is still operating, repair or replace wiring harness between hydraulic unit and ECM.
  2. Remove and test motor relay. See HYDRAULIC UNIT RELAYS under DIAGNOSIS & TESTING. If relay is okay, go to next step. If relay is faulty, replace relay.
  3. Check pump motor ground connection. If ground is okay, go to next step. If ground is bad, repair ground connection. Ensure ground wire has a clean, tight connection.
  4. Install motor relay. Disconnect hydraulic unit 10-pin connector. Using a DVOM, measure voltage between motor relay connector terminal No. 51 (Red/Black wire) and ground. See WIRING DIAGRAM. If battery voltage exists, go to next step. If battery voltage does not exist, repair or replace broken wire in hydraulic unit wiring harness.
  5. Connect hydraulic unit wiring harness. Ensure ignition switch is in OFF position. Disconnect ECM wiring harness connector. Using an ohmmeter, measure resistance between ECM connector terminals No. 2 (Blue/Yellow wire) and No. 26 (Green/Black wire). See Figure . Resistance should be 30-60 ohms. If resistance is not within specification, repair or replace wiring harness between hydraulic unit and ECM. If resistance is within specification, motor relay circuit is okay. Replace faulty ECM.
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