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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 P0564: Cruise Control Multi-Function Switch Circuit >> Diagnostic Aids
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Diagnostic Aids

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.

For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

DTC P0564

Step Action Values Yes No
Schematic Reference : Cruise Control Schematics 
Connector End View Reference: Cruise Control Connector End Views  or to Engine Control Module (ECM) Connector End Views in Engine Controls - 3.6L (LY7)
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. Turn OFF the ignition.
  2. Disconnect C4 of the multifunction switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a DMM, measure the voltage of the ignition 1 voltage circuit.
Does the voltage measure at the specified value?		 B+ Go to Step 3  Go to Step 7 
3
IMPORTANT: The cruise control ON/OFF switch must be turned ON to correctly view the set/coast switch and the resume/accel switch resistance values with the DMM.
  1. Turn OFF the ignition.
  2. With a DMM, measure the resistance of the cruise control switch between the ignition 1 voltage circuit and the cruise control set/coast and resume/accelerate switch signal circuit.
  3. Individually activate and hold the cruise control function switches while measuring the resistance of the cruise control function switches.
Do the cruise control function switch resistance values measure between the specified values?		 Off = O.L.
On = 7.8 K Ω - 8.6 K Ω
Resume = 2.7 K Ω - 3.0 K Ω
Set = 1.2 K Ω - 1.3 K Ω		 Go to Step 4  Go to Step 5 
4 Test the cruise control set/coast and resume/accelerate switch signal circuit for a high resistance, for a short to voltage, or for a short to ground between the cruise control switch and the ECM. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  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 10  Go to Step 8 
6 Inspect for poor connections at the harness connector of the engine control module (ECM). 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 10  Go to Step 9 
7 Repair the high resistance in the ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 10  -
8 Replace the cruise control switch. Refer to Multifunction, Turn Signal Switch Replacement in Steering Wheel and Column.
Did you complete the replacement?		 - Go to Step 10  -
9
IMPORTANT: Program the replacement ECM.
Replace the ECM. Refer to Engine Control Module (ECM) Replacement in Engine Controls - 3.6L (LY7).Did you complete the replacement?		 - Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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