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Home >> Cadillac >> 2003 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 630 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0568: Cruise Control Set Switch Circuit >> Test Description
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Test Description

WARNING: This page is about a different car, the 2004 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 2:  This step determines if a condition is present.
DTC P0568

Step Action Yes No
Schematic Reference : Cruise Control Schematics 
Connector End View Reference: Cruise Control Connector End Views Powertrain Control Module (PCM) Connector End Views in Engine Controls - 5.7L, or Engine Controls Connector End Views in Engine Controls - 5.7L
1 Did you perform the Cruise Control Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Cruise Control (2.6L, 3.2L and 3.6L)  or Diagnostic System Check - Cruise Control (5.7L) 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn the cruise ON/OFF control switch ON.
  4. With the scan tool, observe the Cruise Set/Coast Switch parameter in the PCM data list.
Does the Cruise Set/Coast Switch parameter display On?		 Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  3. Disconnect C208.
  4. Turn ON the ignition, with the engine OFF.
  5. With the scan tool, observe the Cruise Set/Coast Switch parameter in the PCM data list.
Does the Cruise Set/Coast Switch parameter display On?		 Go to Step 4  Go to Step 5 
4 Test the cruise control set/coast switch signal circuit for a short to voltage. 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 cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
6 Inspect for poor connections at the harness connector of the throttle actuator control (TAC) module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
7 Replace the TAC module. Refer to Throttle Actuator Control (TAC) Module Replacement in Engine Controls - 5.7L.
Did you complete the replacement?		 Go to Step 9  -
8 Replace the cruise control switch. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column.
Did you complete the replacement?		 Go to Step 9  -
9
  1. Install the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  2. Enable the inflatable restraint steering wheel module. Refer to SIR Disabling and Enabling Zone 3 in SIR.
  3. Use the scan tool in order to clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 Go to Step 2  System OK
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