B3124
DTC B3124
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 B3124 02
- Keyless Entry Antenna 6 Short to Ground
DTC B3124 05
- Keyless Entry Antenna 6 High Voltage/Open
Diagnostic Fault Information
Circuit/System Description
The rear compartment antenna is located on the rear compartment floor near the seat back, centered, and is used to establish low frequency communications with the keyless entry transmitter. When the driver attempts to change the ignition status of the vehicle, i.e. starting the vehicle, the keyless entry control module communicates with the rear compartment antenna.
Conditions for Running the DTC
* The touch pad in the driver door or passenger door handle is touched within 15 minutes of any door ajar status changing.
* Any exterior door handle or handles is pulled.
* The last door becomes closed.
* Pressing the start/stop switch.
* The scan tool activates a device control function to simulate the above actions.
Conditions for Setting the DTC
B3124 02
The keyless entry control module detects a short to ground on the rear compartment keyless entry antenna circuit.
B3124 05
The keyless entry control module detects a short to B+ or an open on the rear compartment keyless entry antenna circuit.
Action Taken When the DTC Sets
* Vehicle will not detect the key fob in some locations inside the vehicle. If key fob is not detected then vehicle will not start when start/stop button is pressed.
* Doors will not unlock when any door handle is pulled. Doors will not lock with touch pad. Rear closure will not open when doors are locked and touch pad is pressed. Vehicle will not start when start/stop switch is pressed.
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 (without ATH) (Keyless Entry System Description and Operation (Without ATH))Keyless Entry System Description and Operation (with ATH) (Keyless Entry System Description and Operation (With ATH))
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
Note: Verify that the pins are correct for all of the antennas. Make sure to fix any problems with other interior antennas, rear center console and front center console first, DTCs B3123, B3122 respectively, before fixing the problem with the rear compartment antenna, DTC B3124.
1. Ignition OFF, disconnect the harness connector at the T10E rear compartment antenna.
2. Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 1, connector on vehicle side, and vehicle ground and also does not illuminate between low reference signal circuit terminal 2, connector on vehicle side, and vehicle ground.
• If the test lamp illuminates, disconnect the connector at the keyless entry control module, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the keyless entry control module.
3. Connect a DMM, set to capture DC voltage using the MIN MAX function, between the signal circuit terminal 1 and vehicle ground.
Note: Use DC voltage because comparing to vehicle ground
4. Activate the rear compartment antenna by pressing the start/stop button or pulling any exterior door handle or handles. After hitting the min/max button looking for any voltage, verify the DMM captured a DC voltage signal.
• If the DC voltage was not captured, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the keyless entry control module.
5. Connect a DMM, set to capture DC voltage using the MIN MAX function, between the low reference circuit terminal 2 and vehicle ground.
6. Activate the rear compartment antenna by pressing the start/stop button or pulling any exterior door handle or handles or rear compartment touch pad. After hitting the min/max button looking for any voltage, verify the DMM captured a DC voltage signal.
• If the DC voltage was not captured, test the low reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the keyless entry control module.
• Clear DTCs then activate the rear compartment antenna by pressing the start/stop button or pulling any exterior door handle/handles or rear compartment touch pad and check for DTCs again.
• If DTC B3124 returns replace the T10E rear compartment antenna. Clear DTCs again then activate the rear compartment antenna by pressing the start/stop button or pulling any exterior door handle/handles or rear compartment touch pad and check for DTCs.
• If DTC B3124 returns, replace the keyless entry control module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for keyless entry control module replacement, setup, and programming