B3123

DTC B3123

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptors
DTC B3123 00
- Keyless Entry Antenna 5 Performance - Console Passive Antenna




Diagnostic Fault Information






Circuit/System Description

The console passive antennas is located in the center console and is used to establish low frequency (LF) communications with the keyless entry transmitter.. The console antennas is used to determine transmitter placement within the vehicle. When a valid keyless entry transmitter is within the passenger compartment, the console antenna broadcasts a challenge within the passenger compartment to the transmitter. If the response from the transmitter via radio frequency (RF) is a valid response, the antenna will determine there is a fob within the vehicle. If no response is received, the antenna determines that no fob is in the vehicle.


Conditions for Running the DTC

A transmitter validation is requested


Conditions for Setting the DTC

An improper voltage level is seen on the keyless entry antenna - signal (2) circuit


Action Taken When the DTC Sets

The console passive keyless entry antenna is ignored. Vehicle starting will require the fob to be placed in the console pocket


Conditions for Clearing the DTC

* A current DTC will clear when the conditions for setting the DTC are no longer present
* A history DTC will clear after 50 malfunction free ignition cycles



Reference Information
Schematic Reference

Remote Function Schematics (Remote Function Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Keyless Entry System Description and Operation (without RPO Y41) (Keyless Entry System Description and Operation (without RPO Y41))Keyless Entry System Description and Operation (with RPO Y41) (Keyless Entry System Description and Operation (with RPO Y41))
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the console passive antenna.
2. Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal A and ground.

• If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the RCDLR.

3. Install a DMM between the signal circuit terminal A and the low reference circuit terminal B. Set the DMM to capture AC voltage using the MIN MAX function.
4. Attempt to start the vehicle. Verify the DMM captured an AC voltage signal.

• If an AC voltage was not captured, test the signal circuit and the low reference circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the RCDLR.

5. If all circuits test normal, test or replace the console passive antenna.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Passive) (Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Passive))Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Active) (Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Active))
* Control Module References (Programming and Relearning) for RCDLR replacement, setup, and programming