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Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the associated Cruise Control Switch parameter in the PCM 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 Wiring Systems.

DTC P0564

Step Action Values Yes No
Schematic Reference: Cruise Control Schematics 
Connector End View Reference: Cruise Control Connector End Views  or Powertrain Control Module (PCM) Connector End Views in Engine Controls - 3.8L (L26 and L32)
1 Did you perform the Cruise Control Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Cruise Control 
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn the cruise On/Off control switch OFF.
  4. With the scan tool, observe the Cruise Mode Signal parameter in the powertrain control module (PCM) Cruise Control data list.
Does the Cruise Mode Signal parameter display at or above the specified value?		 3.5 V Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect C1 of the cruise control switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a DMM, measure the voltage of the cruise control set/coast and resume/accelerate switch signal circuit between C1 and the PCM.
Does the voltage measure at or greater than the specified value?		 3.5 V Go to Step 4  Go to Step 5 
4 Test the cruise control set/coast and resume/accelerate switch signal circuit for a short to voltage between the cruise control switch and the PCM. 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 7 
5 Test the cruise control set/coast and resume/accelerate switch signal circuit for a short to voltage between C1 and the cruise control switch. 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 
6 Inspect for poor connections at the harness connector of the cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and toConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
8 Replace the cruise control switch. Refer to Cruise Control Switch Replacement .
Did you complete the replacement?		 - Go to Step 10  -
9
IMPORTANT: Program the replacement PCM.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 3.8L (L26 and L32).Did you complete the replacement?		 - Go to Step 10  -
10
  1. Enable the inflatable restraint steering wheel module. Refer to SIR Disabling and Enabling Zone 3 in SIR.
  2. Use the scan tool in order to clear the DTCs.
  3. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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