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 P0564: Cruise Control Multifunction Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
B+ | 1 | P0564 | 1 | -- | P0564 |
Cruise Control ON/OFF Switch Signal | 1 | P0564 | 1 | -- | P0564 |
Cruise Control Resume/Accel. Switch Signal | 1 | -- | 1 | -- | -- |
Cruise Control Set/Coast Switch Signal | 1 | -- | 1 | -- | -- |
1. Cruise Control Malfunction | |||||
Circuit/System Description
The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control on/off, set/coast, and the resume/accelerate switch signal circuits in order to detect when a cruise control function switch has been activated. The BCM detects a predetermined voltage signal when a cruise control function switch is applied, with each switch having a different voltage value.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The cruise switch is ON. |
Conditions for Setting the DTC
| • | The ECM detects an invalid voltage signal on the cruise control switch signal circuit. |
| • | The above condition is present for greater than 2 seconds. |
| • | The ECM runs this diagnostic every 0.05 second. |
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 and Set as the applicable switch is pressed.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the K20 steering wheel control switch-left.
- Ignition ON, test for B+ between the voltage reference circuit and ground.
- Test for B+ between the voltage reference circuit and the signal circuit.
- Ignition OFF, disconnect the X3 harness connector at the K9 BCM.
- Test for infinite resistance between the signal circuit terminal 9 and ground.
- If all circuits test normal, test or replace the K20 steering wheel control switch-left.
| ⇒ | If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | If less than the specified value, test the signal circuit for a short to ground. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM or ECM replacement, setup, and programming
