The numbers below refer to the step numbers on the diagnostic table.
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.
The presence of DTCs which begin with a "U" indicate some other module is not communicating on the class 2 serial data circuit. The specified procedure will compile all the available information before tests are performed.
Step | Action | Yes | No | ||||||||||
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Schematic Reference: Instrument Cluster Schematics | |||||||||||||
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 Communications | ||||||||||
Does the scan tool communicate with the control modules listed above? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||||||||
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 Communications | Go to Step 5 | |||||||||||
5 | Does the scan tool display DTC B1000, B1013, B1334, B1339, B1354, or B1422? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 6 | ||||||||||
6 | Does the scan tool display DTC P0560 or P0620? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical |