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M30 & Q45

  1. Raise and support vehicle. Turn ignition on. Connect voltmeter between cruise control module connector terminals No. 3 and 7. See Figure or Figure .
  2. While slowly turning rear wheels, check for voltmeter needle deflection. If needle deflects, speed sensor and circuit are okay. If needle does not deflect, check speed sensor. If speed sensor is okay, check speed sensor wiring circuit.
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