Step
| Action
| Yes
| No
|
1
| Perform the Diagnostic System Check for the module which does not communicate to ensure that the module is properly powered.
Was a repair made when the Diagnostic System Check was performed?
| Go to Step 6
| Go to Step 2
|
2
| - Disconnect the star connector.
- Inspect for poor connections/terminal tension at the star connector. Refer to Connector Repairs .
Did you find and correct the condition?
| Go to Step 6
| Go to Step 3
|
3
| Test the class 2 serial data circuit of the module that is not communicating for an open between the module and the star connector. Refer to Wiring Repairs .
Did you find and correct the condition?
| Go to Step 6
| Go to Step 4
|
4
| Inspect for poor connections/terminal tension at the class 2 serial data circuit(s) of the module that is not communicating. Refer to Connector Repairs .
Did you find and correct the condition?
| Go to Step 6
| Go to Step 5
|
5
| Replace the module which is not communicating. Refer to the appropriate Repair Instructions for module replacement.
Did you complete the replacement?
| Go to Step 8
| --
|
6
| - Install a scan tool.
- Turn on the ignition leaving the engine off.
- Select the display DTCs function for the module which was not communicating.
Does the scan tool display any DTCs which do not begin with a U?
| Go to the applicable DTC table
| Go to Step 7
|
7
| Clear the DTCs using the scan tool.
Did you complete the action?
| Go to Step 8
| --
|
8
| Select the display DTCs function for the module(s) which had the Lost Communications with XXX DTC set.
Does the scan tool display any DTCs which do not begin with a U?
| Go to the applicable DTC table
| Go to Step 9
|
9
| - Clear the DTCs using the scan tool.
- Continue diagnosing or clearing the DTCs until all the modules have been diagnosed and all the DTCs have been cleared.
Did you complete the action?
| System OK
| --
|