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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0571 - Cruise Control Brake Switch Circuit >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

In order to avoid a misdiagnosis, inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.

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

DTC P0571

Step Action Yes No
Schematic Reference: Cruise Control Schematics 
Connector End View Reference: Engine Control Module (ECM) Connector End Views in Engine Controls - 3.6L (LY7)
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 Do the stop lamps operate properly? Go to Step 3  Go to Stop Lamps Inoperative or to Stop Lamps Always On in Lighting Systems
3
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, observe the Stoplamp Pedal Switch parameter in the Body and Accessories, Cruise Control data list.
  4. Press and hold the brake pedal.
Does the Stoplamp Pedal Switch parameter display Applied?		 Go to Step 5  Go to Step 4 
4 Test the stop lamp switch signal circuit for an open or for a high resistance between the body control module (BCM) and the engine control module (ECM). Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 6 
5 Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
6 Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
7 Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 9  -
8 Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 9  -
9
  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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