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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Cruise Control) >> Diagnostic Information and Procedures >> DTC P1574 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Exterior Lighting Systems Description and Operation in order to avoid a misdiagnosis.

For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .

DTC P1574

Step Action Yes No
Schematic Reference: Cruise Control Schematics 
Connector End View Reference: Lighting Systems Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Depress the brake pedal.
  4. With the scan tool, observe the Stoplamp Pedal Switch parameter in the powertrain control module (PCM) Cruise Control Data list.
Does the Stoplamp Pedal Switch parameter display Released?		 Go to Step 3  Go to Diagnostic Aids
3 Do the stop lamps operate properly? Go to Step 4  Go to Stop Lamps Inoperative
4 Repair the open or the high resistance in the stop lamp switch signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 Go to Step 5  -
5
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 Go to Step 2  System OK
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