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.
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At this point you have determined all DTCs which could affect the keyless entry system. Refer to Symptoms - Keyless Entry for further keyless entry diagnosis. Any other codes displayed from the listed modules do not apply to the keyless entry system and should be diagnosed in the applicable section.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Keyless Entry 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 module? | 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 RCDLR and the BCM. Does the scan tool display any DTCs? | Go to Step 4 | Go to Symptoms - Keyless Entry |
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 or B1001? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 6 |
Does the scan tool display DTC B3127 or B3128? | Go to Diagnostic Trouble Code (DTC) List In Doors. | Go to Symptoms - Keyless Entry | |
