Diagnostic Aids

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

In order to avoid a misdiagnosis, perform the following:

Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation .
Inspect for proper adjustment of the stop lamps. Refer to Stop Lamp Switch Adjustment .
Inspect for proper adjustment of the cruise control release switch. Refer to Cruise Release Switch Adjustment .
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .

DTC P0571 (3.5L)

Step	Action	Yes	No
Schematic Reference: Cruise Control Schematics Connector End View Reference: Cruise Control Connector End Views or 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	Turn OFF the ignition. Install a scan tool. Turn ON the ignition, with the engine OFF. With the scan tool, observe the Cruise Brake Switch parameter in the Idle/Speed Control General Info Inputs data list. Does the Cruise Brake Switch parameter display Released?	Go to Step 3	Go to Step 4
3	Press and hold the brake pedal. With the scan tool, observe the Cruise Brake Switch parameter in the Idle/Speed Control General Info Inputs data list. Does the Cruise Brake Switch parameter display Applied?	Go to Diagnostic Aids	Go to Step 6
4	Turn OFF the ignition. Disconnect the cruise/brake switch. Turn ON the ignition, with the engine OFF. Connect a test lamp between the ignition 1 voltage circuit and a good ground. Does the test lamp illuminate?	Go to Step 5	Go to Step 11
5	Turn OFF the ignition. Connect a 3-ampere fused jumper between the ignition 1 voltage circuit and the cruise/brake switch signal circuit. Turn ON the ignition, with the engine OFF. With the scan tool, observe the Cruise Brake Switch parameter. Does the Cruise Brake Switch parameter display Released?	Go to Step 9	Go to Step 8
6	Turn OFF the ignition. Disconnect the cruise/brake switch. Turn ON the ignition, with the engine OFF. With the scan tool, observe the Cruise Brake Switch parameter. Does the Cruise Brake Switch parameter display Applied?	Go to Step 9	Go to Step 7
7	Test the cruise/brake switch signal circuit for a short to voltage. Refer Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	Go to Step 14	Go to Step 10
8	Test the cruise/brake switch signal circuit for the following: An open A short to ground A high resistance Refer Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	Go to Step 14	Go to Step 10
9	Inspect for poor connections at the harness connector of the cruise/brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition?	Go to Step 14	Go to Step 12
10	Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition?	Go to Step 14	Go to Step 13
11	Repair the following in the ignition 1 voltage circuit. An open A short to ground A high resistance Refer Circuit Testing and to Wiring Repairs . Did you complete the repair?	Go to Step 14	-
12	Replace the cruise/brake switch. Refer to Cruise Release Switch Replacement . Did you complete the replacement?	Go to Step 14	-
13	Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 14	-
14	Use a scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset?	Go to Step 2	System OK