B3100

DTC B3100

DTC DESCRIPTOR

DTC B3100
Keyless Entry Data Link Circuit.

DIAGNOSTIC FAULT INFORMATION






IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
This is a variable indicating the state of the remote function actuator (RFA) FOB. This information is transmitted by the RFA-X module to the body control module (BCM). The BCM shall generate GMLAN messages in response to received X-LINK messages only as required to support distributed functionality for Entry Control, Security Feedback, etc. within the vehicle.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC

B3100 01
The RFA input is inactive high, while the BCM is asserting the RFA Link output low during a transmission on the RFA Link output.

B3100 02
The RFA Link input is active low more than 1 second.

B3100 73
The BCM receives a message that has parity, or level error of transmission.

ACTION TAKEN WHEN THE DTC SETS
The RFA system is inoperative

CONDITIONS FOR CLEARING THE DTC
- A current DTC will clear when the fault is no longer present and the ignition switch is cycled.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- A scan tool may be used to clear history and current DTCs.

CIRCUIT/SYSTEM VERIFICATION
The BCM supplies the remote control door lock receiver (RCDLR) with battery voltage. When the lock, unlock button is pressed on the remote keypad the RCDLR receives the signal. Which in return sends a signal to the BCM to lock or unlock the door locks, the BCM applies a voltage to the door lock switches.

CIRCUIT/SYSTEM TESTING
1. Install a scan tool, turn ignition ON, with the engine OFF. Observe the status of DTC B3100. If the DTC is not current, test for intermittent conditions and poor connections.
2. Turn OFF the ignition, disconnect the electrical connector from the RCDLR. Connect a DMM from the keyless entry serial data circuit to a good ground. Turn ON the ignition, observe the voltage. Specification: battery voltage.
- If battery voltage is not present, test the keyless entry serial data circuit for a short to ground. Correct the problem.
- If a problem was not found and corrected, inspect for a poor connection at the harness connector of the RCDLR. Correct the problem.
- If a problem was not found and corrected, replace the BCM. Clear codes, verify the repair.
- If battery voltage is present, inspect for poor connections at the harness connector of the RCDLR. Correct the problem.
- If a problem was not found and corrected, replace the RCDLR. Clear codes, verify the repair.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Body Control Module Replacement
- Control Module References for BCM replacement, setup, and programming.