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 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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Checks for DTCs for each module of the system.
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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 |
|---|---|---|---|
Schematic Reference: Navigation System 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? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |
Select the display DTCs function on the scan tool for the navigation radio. 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 Step 5 | Go to Step 6 | |
5 | Does the scan tool display U2153? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |
6 | Does the scan tool display DTC B1000, B1004, B1007, or B1009? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 7 |
7 | Does the scan tool display DTC B1327 or B1328? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical | |
