Service Information

Volt

DTC P0564

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 Circuit

Diagnostic 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

The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control on/off, set/coast, the resume/accelerate and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function. 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 engine is running.

•	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

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Vehicle 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

Vehicle OFF, disconnect the harness connector at the S70L steering wheel controls switch-left.
Vehicle in Service Mode, test for B+ between the voltage reference circuit terminal 1 and ground.

⇒	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.

Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminal 3.

⇒	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.

Vehicle OFF, disconnect the X3 harness connector at the K9 BCM.
Test for infinite resistance between the signal circuit terminal 9 and ground.

⇒	If less than the specified value, test the signal circuit for a short to ground.

If all circuits test normal, test or replace the S70L steering wheel controls switch-left.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM or ECM replacement, programming and setup