P0564
DTC P0564
Diagnostic Instructions
* Perform the 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 00
- Cruise Control MultiFunction Switch Circuit
Circuit/System Description
The cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control set/coast and resume/accelerate switch signal circuit in order to detect when a cruise control function has been requested. The ECM detects a specific voltage signal on the cruise control set/coast and resume/accelerate switch signal circuit when a cruise control function switch is activated, with each switch having a different predetermined voltage value.
Conditions for Running the DTC
* The cruise switch is ON.
* The ignition is ON.
Conditions for Setting the DTC
This DTC sets if the ECM detects that the voltage on the cruise control set/coast and resume/accelerate switch signal circuit is 3.5 volts or above for greater than 2 seconds.
Action Taken When the DTC Sets
* The ECM stores the DTC information into memory when the diagnostic runs and fails.
* The malfunction indicator lamp (MIL) will not illuminate.
* The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.
* The cruise control is disabled.
Conditions for Clearing the DTC
* The DTC becomes history when the fault is no longer present.
* A History DTC clears after 100 malfunction-free ignition cycles.
* The ECM receives a clear code command from the scan tool.
Diagnostic Aids
* Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the Cruise On/Off Switch, Cruise Resume/Accel Switch and Cruise Set/Coast Switch parameters in the ECM Cruise Control data list. This will help eliminate the possibility of an internally shorted inflatable restraint steering wheel module coil.
* For an intermittent condition, Refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics
Circuit/System Testing
Caution: Refer to SIR Caution.
Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling.
1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement.
2. Disconnect the harness connector at the cruise control switch assembly.
3. Ignition ON, measure for 10 volts or greater at the cruise control supply voltage circuit terminal 1.
• If less than the specified value, check for an open/high resistance or a short to ground on the cruise control supply voltage circuit.
4. Ignition ON, measure for 10 volts or greater between B+ and the cruise control switch signal circuit terminal 5.
• If the test lamp does not illuminate, test the cruise control switch signal circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition OFF, disconnect the harness connector C1 at the ECM.
6. Measure for 0 volts between B+ and the cruise control switch signal circuit terminal 5.
• If greater than the specified voltage, test the cruise control switch signal circuit for a short to ground.
7. If the circuits test normal, test the component. If the circuits and the component tests are normal, replace the ECM.
Component Testing
Caution: Refer to SIR Caution.
Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling.
Important: The cruise control switch must be ON in order to properly measure the resistance of the set/cruise and the resume/accel switches.
1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement.
2. Disconnect the harness connector at the cruise control switch.
3. Cruise control switch ON, measure the resistance between terminals 1 and 5 at the cruise control switch side of the connector. Individually activate and hold each cruise control function switch and compare the resistance reading to the values on the schematic for the ON/OFF, set/cruise, and the resume/accel.
• If any of the resistance measurements for the OFF, ON, set/cruise, resume/accel are not within the listed resistance values, replace the cruise control switch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Turn Signal Multifunction Switch Replacement
* Programming and RelearningProgramming and Relearning