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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 961 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P1574: Stoplamp Switch Circuit >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

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

DTC P1574

Step Action Yes No
Schematic Reference : Cruise Control Schematics 
Connector End View Reference: Cruise Control Connector End Views 
1 Did you perform the Cruise Control Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Cruise Control 
2
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. Depress the brake pedal.
  4. With the scan tool, observe the Stop lamp Pedal Switch parameter in the PCM Cruise Control Data, data list.
Does the Stop lamp 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 in Lighting Systems
4 Repair the open or the high resistance in the stop lamp switch signal circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
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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