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. The specified procedure will determine the particular condition. Attempt to communicate with the following modules:
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The Symptom Table will determine the correct diagnostic procedure to use.
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The presence of DTCs which begin with the letter U indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
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If DTC B1422 is set, the RAP feature may be disabled.
| • | Audio amplifier |
| • | Cellular telephone module w/UV8 |
| • | Dash integration module (DIM) |
| • | Driver door module (DDM) |
| • | Driver door switch assembly (DDSA) |
| • | Left middle door module (LMDM) w/V4U |
| • | Left rear door module (LRDM) |
| • | Memory seat module (MSM) |
| • | Navigation display head w/UY4 |
| • | Navigation data processor w/UY4 |
| • | Front passenger door module (FPDM) |
| • | Radio |
| • | Rear integration module (RIM) |
| • | Right middle door module (RMDM) w/V4U |
| • | Right rear door module (RRDM) |
| • | Steering column module |
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 these modules? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communication. | |||||||||
Select the Display DTCs function for each module. If using a Tech 2, use the Class 2 DTC Check feature in order to determine which modules have DTCs set. Does the scan tool display any DTCs? | Go to Step 4 | ||||||||||
Select the modules' display DTC function on the scan tool. Does the scan tool display DTCs that begin with the letter "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 any of the following DTCs?
| Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 6 | ||||||||
6 | Does the scan tool display any of the following DTCs?
| Go to Diagnostic Trouble Code (DTC) List in Engine Electrical | Go to Step 7 | ||||||||
Does the scan tool display DTC B1422? | Go to Diagnostic Trouble Code (DTC) List in Body Control System |
