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 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 | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Install a scan tool. Does the scan tool power up? | -- | Go to Step 2 | Go to Scan Tool Does Not Power Up in Wiring Systems |
Does the scan tool communicate with the BCM? | -- | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Data Line in Wiring Systems | |
3 | Select the body control module display DTCs function on the scan tool. Does the scan tool display any DTCs? | -- | Go to Step 4 | Go to the appropriate System Starting Point for the related symptom |
Does the scan tool display any DTCs which begin with a U? | -- | Go to Scan Tool Does Not Communicate with Class 2 Data Line in Wiring Systems | Go to Step 5 | |
5 | Does the scan tool display DTC B1007, B1009 or B1015? | -- | Go to Step 6 | |
6 | Does the scan tool display DTC B1339, B1344, B1349 or B2559? | -- | Go to the appropriate System Starting Point for the related symptom |
