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 or a total malfunction of the class 2 serial data circuit. The specified procedure will determine the condition.
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The presence of DTC's which begin with "U" indicate some other system control module is not communicating.
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 Communications | ||||
Does the scan tool communicate with the (VIU)? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||
3 | Select the Vehicle Interface Unit (VIU) display DTCs function on the scan tool. 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 DTC U1500? | Go to DTC U1001-U1254 Lost Communication with XXX in Data Link Communications | |||||
6 | Does the scan tool display DTC B1000, B1004, or B1009? | Go to Step 7 | |||||
7 | Does the scan tool display any DTC's? | -- |
