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DTC B3122

DTC B3122

Diagnostic Instructions


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

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC B3122 02

Keyless Entry Antenna 4 Short to Ground

DTC B3122 05

Keyless Entry Antenna 4 High Voltage/Open

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Keyless Entry Antenna - Center Console Front Signal

B3122 02

B3122 05

B3122 05

-

Keyless Entry Antenna - Center Console Front Low Reference

-

B3122 05

-

-



Circuit/System Description

The console active antenna is located in the center console and is used to establish low frequency 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 radio/low frequency 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 switch 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 touch pad in the driver door or passenger door handle is touched within 15 min 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

B3122 02

The keyless entry control module detects a short to ground on the center console front keyless entry antenna circuit.

B3122 05

The keyless entry control module detects a short to B+ or an open on the center console front 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.


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 40 malfunction-free ignition cycles.


Reference Information

Schematic Reference

Remote Function Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Keyless Entry System Description and Operation (With ATH) Keyless Entry System Description and Operation (Without ATH)

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Note

Verify that the pins are correct for all of the antennas. If DTC B3122 is set, any problems with B3123 has to be fixed first before proceeding to fix the problem with B3122.



1. Ignition OFF, disconnect the harness connector at the T10J Keyless Entry Antenna - Center Console Front.

2. Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 1 and ground.

3. If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal replace the K84 Keyless Entry Control Module.

4. Verify a test lamp does not illuminate between the low reference circuit terminal 2 and ground.

5. Connect a DMM, set to capture alternating voltage using the MIN MAX function, between the signal circuit terminal 1 and ground.

Note

Use DC voltage because comparing to vehicle ground.


6. Activate the front center console antenna by pressing the START/STOP button or pulling any exterior door handle or handles. After pressing the MIN/MAX button looking for any voltage, verify the DMM captured a DC voltage signal.

7. 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 K84 Keyless Entry Control Module.

8. Connect a DMM, set to capture alternating voltage using the MIN MAX function, between the signal circuit terminal 1 and the low reference circuit terminal 2.

9. Activate the front center console antenna by pressing the START/STOP button or pulling any exterior door handle or handles. After pressing the MIN/MAX button looking for any voltage, verify the DMM captured a DC voltage signal.

10. 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 K84 Keyless Entry Control Module.

11. If all circuits test normal, replace the T10J Keyless Entry Antenna - Center Console Front. Clear DTCs and then press the START/STOP button and check for any DTCs. If DTC B3122 returns, replace the K84 keyless entry control unit.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming