DTC Descriptor

DTC B3100 01: Keyless Entry Data Link Circuit

DTC B3100 02: Keyless Entry Data Link Circuit Short to Ground

DTC B3100 03: Keyless Entry Data Link Circuit Parity Error

Diagnostic Fault Information

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

Circuit/System Description

When any keyless entry transmitter button is pressed, an RF signal is sent to the remote control door lock receiver (RCDLR) indicating the specific function desired. This information is then transmitted by the RCDLR to the body control module (BCM). When this information is received, the BCM will perform the specific requested function.

Conditions for Running the DTC

An RFA request is sent from the RCDLR to the BCM.

Conditions for Setting the DTC

B3100 01

The serial data signal circuit is shorted to B+ during communication between the RCDLR and BCM.

B3100 02

The serial data signal circuit is shorted to ground during communication between the RCDLR and BCM.

B3100 73

A message is received by the BCM during communication that is not recognized.

Action Taken When the DTC Sets

Keyless entry functions are disabled.

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Keyless Entry Schematics

Connector End View Reference

Keyless Entry Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Scan Tool Reference

Circuit/System Verification

While operating each function using the keyless entry transmitter, observe the vehicle. Each button press should result in the expected action on the vehicle.

Circuit/System Testing

1. Ignition OFF, disconnect the C2 harness connector at the BCM.
2. Test for 10.8 to 11.8 volts between the signal circuit terminal 12 and ground.

⇒	If less than 10.8 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the RCDLR

⇒	If greater than 11.8 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the RCDLR.

3. Set the DMM to the DC Min-Max setting.
4. Observe the DMM while pressing a keyless entry transmitter button. The reading should momentarily change between the Max and Min values. The Max value should be greater than 10.8 volts and the Min value should be less than 4 volts.

⇒	If not equal to the specified Max and Min range, replace the RCDLR.

5. If all circuits test normal, test or replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM or RCDLR replacement, setup, and programming.