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Home >> Chevrolet >> 2007 >> Uplander Base, 3.9 1 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> DTC P0564 >> Circuit/System Testing

Circuit/System Testing

CAUTION: Refer to SIR Caution .

Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling .

  1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
  2. Disconnect the harness connector of the cruise control switch assembly.
  3. Ignition ON, measure for 10 volts or greater at the cruise control supply voltage circuit.
    • If less than the specified value, check for an open/high resistance or a short to ground on the cruise control supply voltage circuit.
  4. Ignition ON, verify that a test lamp illuminates between B+ the cruise control switch signal circuit.
    • If the test lamp does not illuminate, test the cruise control switch signal circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, test the cruise control switch signal circuit for a short to ground.
    • If the circuit tests normal, test the component. If the circuits and the component tests are normal, replace the ECM.
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