Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
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The symptom list in Symptoms will determine the correct diagnostic procedure to use.
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The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
Step | Action | Yes | No | |||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Battery Check? | Go to Step 2 | Go to Battery Inspection/Test | |||||
2 | Install a scan tool. Does the scan tool power up? | Go to Step 3 | Go to Scan Tool Does Not Power Up in Data Link Communications | |||||
Does the scan tool communicate with the BCM and PCM? | Go to Step 4 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | ||||||
Select the BCM and the PCM display DTC function on the scan tool. Does the scan tool display any DTCs? | Go to Step 5 | Go to Symptoms | ||||||
Does the scan tool display any DTCs which begin with U? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 6 | ||||||
6 | Does the scan tool display DTC's P0562, P0563, P1637 OR P1638? | Go to Diagnostic Trouble Code (DTC) List/Type in Engine Controls - 5.7L | Go to Step 7 | |||||
7 | Does the scan tool display DTC B1000? | Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System | Go to Step 8 | |||||
8 | Does the scan tool display DTC's B2721, B2722, B2723 , OR B2735? | Go to Diagnostic Trouble Code (DTC) List/Type in Theft Deterrent | Go to Control Module References in Data Link Communications | |||||
