For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC B3101: Keyless Entry Data Link Circuit Range/Performance

### Circuit/System Description

The Onstar module communicates with the RKE module through the IPC. The IPC is the gateway connecting the Onstar and RKE. Using data link circuit the Onstar module can send a signal to RKE in order to control the door lock/unlock.

### Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

### Conditions for Setting the DTC

The Onstar module did not receive the response from RKE module.

### Action Taken When the DTC Sets

The Onstar module can not control the door lock/unlock.

### Conditions for Clearing the DTC

The current DTC clears when the fault is no longer present.

### Reference Information

#### Schematic Reference

Data Communication Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Data Link Communications Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Verify that the remote keyless entry door lock and unlock functions operate normal.

⇒ | If the remote keyless entry door lock and unlock functions do not operate normal refer to Symptoms - Keyless Entry.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.