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Home >> Pontiac >> 2008 >> Grand Prix Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 227 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0564 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
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 at the cruise control switch assembly.
  3. Ignition ON, measure for 10 volts or greater at the cruise control supply voltage circuit terminal 1.
    • 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, measure for 10 volts or greater between B+ and the cruise control switch signal circuit terminal 5.
    • 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, disconnect the harness connector C1 at the ECM.
  6. Measure for 0 volts between B+ and the cruise control switch signal circuit terminal 5.
    • If greater than the specified voltage, test the cruise control switch signal circuit for a short to ground.
  7. If the circuits test normal, test the component. If the circuits and the component tests are normal, replace the ECM.
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