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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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 |
|---|---|---|---|
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 body control module? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |
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 Step 7 |
Does the scan tool display any DTCs which begin with a "U"? | Go to Diagnostic Trouble Code (DTC) List 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 B1477 or 1478? | Go to Step 7 | |
7 | Check the Courtesy Lamps for proper operation. Refer to Interior Lighting Systems Description and Operation in Lighting System. Do the Courtesy Lamps operate properly? | Go to Symptoms - Lighting Systems in Lighting System |
