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 Inspection/Test? | Go to Step 2 | Go to Battery Inspection/Test | ||||||
2 |
Does the scan tool power up? | Go to Step 3 | Go to Scan Tool Does Not Power Up in Data Link Communications | ||||||
Attempt to establish communication with the following components:
Does the scan tool communicate with the BCM, IPC, Immobilizer and PCM? | Go to Step 4 | Go to Scan Tool Does Not Communicate with Class 2 Data Line in Data Link Communications | |||||||
Select the BCM, Immobilizer and PCM display DTC function on the scan tool. Does the scan tool display any DTCs? | Go to Step 5 | ||||||||
Does the scan tool display any DTCs which begin with U? | Go to Scan Tool Does Not Communicate with Class 2 Data Line in Data Link Communications | Go to Step 6 | |||||||
6 | Does the scan tool display DTCs B1973, B1982 or B1983? | Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System |
