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Control Unit Check

  1. Turn ignition on. Slide selector switch to ON position. Leave control unit connector connected. Using a voltmeter, measure voltage between control unit connector terminal No. 3 and ground point located at left or right "A" pillar. See Figure . Battery voltage should be present.
  2. Using a voltmeter, measure voltage between control unit connector terminals No. 10 and 11. Battery voltage should be present.
  3. Turn ignition off. Disconnect control unit connector. Slide cruise control selector switch to ON position. Using an ohmmeter, measure resistance between control unit connector terminal No. 11 and fuse terminal No. 2 (located in fuse panel). Fuse panel on is located behind ashtray 740 and 940 and on left side of instrument panel on 960. Ohmmeter should indicate about zero ohms.
  4. Using an ohmmeter, measure resistance between terminal No. 2 at fuse and control unit connector terminal No. 3. Ohmmeter should indicate about zero ohms.
  5. Using an ohmmeter, measure resistance between control unit connector terminal No. 10 and ground at steering column. Ohmmeter should indicate approximately zero ohms. If all tests check okay, install a new control unit and retest. If all tests do not check okay, check wiring and connectors for open or short circuits.
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