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Home >> Hummer >> 2009 >> H3T Base, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> DTC P1574 >> Component Testing

Component Testing

  1. Ignition OFF, disconnect the harness connector at the stop lamp switch.
  2. Test for infinite resistance between the signal circuit terminal A and B+ terminal B with the switch in the open position.
    • If not the specified value, replace the stop lamp switch.
  3. Test for less than 1 ohm between the signal terminal A and B+ terminal B with the switch in the closed position.
    • If greater than the specified range, replace the stop lamp switch.
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