Diagnostic Aids
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
With a scan tool, observe the cruise control function switch parameters, in the Body and Accessories, Cruise Control data list, while rotating the steering wheel to both steering stops and individually activating each cruise control function switch separately. 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 (3.6L)
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Cruise Control Schematics Connector End View Reference: Cruise Control Connector End Views or Engine Control Module (ECM) Connector End Views in Engine Controls - 3.6L (LY7) |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 |
|
B+ | Go to Step 3 | Go to Step 8 |
| 3 |
IMPORTANT:
The cruise control On/Off switch must be turned ON in order to correctly view the set/coast and the resume/accel switch resistance values with the DMM.
|
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 5 | Go to Step 4 |
| 4 | Test the cruise control set/coast and resume/accelerate switch signal circuit for the following, between C277 and the cruise control switch.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 11 | Go to Step 6 |
| 5 | Test the cruise control set/coast and resume/accelerate switch signal circuit for the following, between the C277 and the engine control module (ECM).
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 11 | Go to Step 7 |
| 6 | Inspect for poor connections at 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 11 | Go to Step 9 |
| 7 | Inspect for poor connections at the harness connector of the 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 11 | Go to Step 10 |
| 8 | 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 11 | - |
| 9 | Replace the cruise control switch. Refer to Steering Wheel Control Switch Assembly Replacement
in Steering Wheel and Column. Did you complete the replacement? |
- | Go to Step 11 | - |
| 10 | Replace the ECM. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? |
- | Go to Step 11 | - |
| 11 |
|
- | Go to Step 2 | System OK |