Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Lack of communication may be due to a partial malfunction of the serial data circuit or due to a total malfunction of the 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 with compile the available information before tests are performed.
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The presence of ABS DTCs indicate that the EBCM requested illumination of the red Brake indicator due to a concern in the ABS system. The presence of DTCs other than those listed are not related to this system.
Step | Action | 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 Data Link Communication | ||||
Does the scan tool communicate with all control modules? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communication | |||||
3 | Select the display DTCs function on the scan tool for the following control modules:
Does the scan tool display any DTCs? | Go to Step 4 | |||||
Does the scan tool display any DTCs which begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communication | Go to Step 5 | |||||
5 | Does the scan tool display DTC B1652, B1656, or B1657? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 6 | ||||
Does the scan tool display DTC B1982 or B1983? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical | Go to Diagnostic Trouble Code (DTC) List in Antilock Brake System |
