Data Link Connector Diagnosis. Buick GL7 (Export) 2000

For 1990-2009 cars

### Circuit Description

The Class II serial data circuit to the data link connector (DLC) allows bi-directional communication between the PCM and the scan tool. If communication between the scan tool and the powertrain control module (PCM) cannot be established, the procedure in the DLC diagnosis table should be used to diagnose the condition.

### Diagnostic Aids

The Class II serial data circuit to the DLC allows bi-directional communication between the PCM and the scan tool. If communication between the scan tool and the PCM cannot be established, the procedure in the DLC Diagnosis table should be used to diagnose the condition.

#### DLC Diagnosis

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check

2

1. Turn On the ignition, with the engine OFF.
2. Attempt to communicate with the PCM

Does the scan tool communicate with the PCM?

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Go to DiagnosticAids

Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications