Test Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The number below refers to the step number on the diagnostic table.
- 7: The module which was not communicating on the class 2 serial data circuit may have set Loss of Communication DTCs for those modules that it was monitoring.
DTC U1001-U1254
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Data Communication Schematics Connector End View Reference: Data Communication Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
IMPORTANT:
Use the control module ID number list in order to determine which module is not communicating. Test the following circuits of the module that is not communicating for an open or a short to ground:
|
Go to Step 7 | Go to Step 3 |
| 3 |
|
Go to Step 7 | Go to Step 4 |
| 4 | Test the class 2 serial data circuits of the module that is not communicating for an open. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 7 | Go to Step 5 |
| 5 | Inspect the harness connectors of the module that is not communicating for poor connections and terminal tension at the following circuits:
Refer to the following:
Did you find and correct the condition? |
Go to Step 7 | Go to Step 6 |
| 6 | Replace the module that is not communicating. Refer to Control Module References
for replacement, setup and programming. Did you complete the replacement? |
Go to Step 7 | - |
| 7 |
|
Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 8 |
| 8 | Select the Display DTCs function for the modules which had the Loss of Communications DTC set. Does the scan tool display any DTCs which do not begin with a "U"? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 9 |
| 9 |
|
System OK | - |