B3122
DTC B3122
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B3122 00
- Keyless Entry Antenna 4 Performance - Console Active Antenna
Diagnostic Fault Information
Circuit/System Description
The console active antenna is located in the center console and is used to establish low frequency (LF) communications with the keyless entry transmitter The keyless entry console active antenna is only used when the console passive antenna was unable to locate a transmitter within the interior of the vehicle. This may be due to a keyless entry transmitter battery being low or RF/LF interference.
When a valid transmitter is placed into the pocket located in the center console, and either the brake pedal is depressed or the ignition control knob is pressed, the console active antenna broadcasts a challenge to the transmitter. This causes a low frequency coupling to occur between the transmitter and the console active antenna. If the response from the transmitter is a valid response, and all of the security requirements are met, the vehicle's engine will start, or be allowed to go into accessory mode.
Conditions for Running the DTC
The console active antenna is activated
Conditions for Setting the DTC
An internal failure is seen at the console active antenna
Action Taken When the DTC Sets
No action is taken
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 (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Keyless Entry System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
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 active antenna.
2. Ignition OFF, test for less than 20 ohms of resistance between the low reference circuit terminal 5 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the RCDLR.
3. Ignition ON, test for B+ between the supply voltage circuit terminal 2 and ground while commanding the scan tool Active Antenna output control ON.
• If not the specified value, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the RCDLR.
4. Ignition OFF, disconnect the X2 harness connector at the RCDLR.
5. Ignition ON, verify a test lamp does not illuminate between the following circuits and ground:
* Signal circuit terminal B
* Signal circuit terminal C
• If the test lamp illuminates, test the appropriate signal circuit for a short to voltage.
6. Ignition OFF, test for infinite resistance between the following circuits and ground:
* Signal circuit terminal B
* Signal circuit terminal C
• If less than the specified value, test the appropriate signal circuit for a short to ground.
7. Test for less than 2 ohms of resistance between the following signal circuits:
* Terminal B at the RCDLR and terminal 3 at the console active antenna
* Terminal C at the RCDLR and terminal 4 at the console active antenna
• If greater than the specified range, test the appropriate signal circuit for an open/high resistance.
8. If all circuits test normal, test or replace the console active antenna.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Rear) (Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Rear))Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Cup Holder) (Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Cup Holder))
* Control Module References (Programming and Relearning) for RCDLR replacement, setup, and programming