Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0568: Cruise Control Set Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Auto Cruise Control Switch B+ | 1 | 1 | -- | -- |
Cruise Control ON Switch Signal | 1 | 1 | -- | -- |
Cruise Control Resume/Accel Switch Signal | 1 | 1 | P0567 | -- |
Cruise Control Set/Coast Switch Signal | 1 | 2 | P0568 | -- |
Cruise Control Switch Ground | -- | 1 | -- | -- |
1. Cruise Control Malfunction 2. Cruise control Set/Coast Malfunction | ||||
Circuit Description
The cruise control set/coast switch is an input to the engine control module (ECM). The ECM monitors the cruise control set/coast switch signal circuit in order to detect when the driver has requested to set the vehicle speed or to decelerate from the currently set speed. The ECM module detects a voltage signal on the cruise control set/coast switch signal circuit when the switch is applied. This DTC sets if the ECM detects that voltage is present on the cruise control set/coast switch signal circuit for longer than 60 seconds.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The cruise control switch is ON. |
Conditions for Setting the DTC
The ECM detects that the set/coast switch is applied for longer than 60 seconds.
Actions Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The cruise control system is disabled. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear after 40 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Cruise Control Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Engine ON, while rotating the steering wheel to both steering stops, observe the scan tool Cruise Control Switch parameter while pressing each of the cruise control switches. The parameter should toggle between ON, OFF, Resume, Set, as the applicable switch is pressed.
Circuit/System Testing
- Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
- Ignition ON, verify the scan tool Set/Coast. Switch parameter displays Inactive.
- If all circuits test normal, test or replace the turn signal/multifunction switch.
| ⇒ | If the parameter displays Active, test the signal circuit terminal 15 for a short to voltage. If the circuit tests normal, replace the ECM module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
