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 02
- Keyless Entry Antenna 4 Short to Ground

DTC B3122 05
- Keyless Entry Antenna 4 High Voltage/Open

Diagnostic Fault Information






Circuit/System Description

The front center console antenna is located in front of the center console assembly and is used to establish low frequency communications with the keyless entry transmitter. When the vehicle on/off switch is pressed, the Keyless Entry Control Module activates the front center console antenna.

Conditions for Running the DTC

Pressing the vehicle on/off switch.

Conditions for Setting the DTC

B3122 02

The Keyless Entry Control Module detects a short to ground on the front center console keyless entry antenna signal circuit.

B3122 05

The Keyless Entry Control Module detects a short to B+ or an open on the front center console keyless entry antenna signal circuit.

Action Taken When the DTC Sets

Vehicle will not detect the transmitter in some locations inside the vehicle. If the transmitter is not detected then vehicle will not change modes when the vehicle on/off 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 40 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Remote Function Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1

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. Vehicle OFF, disconnect the harness connector at the T10J Center Console Front Keyless Entry Antenna, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 1 and ground.

• If 1 V or greater

1. Vehicle OFF, disconnect the harness connector at the K84 Keyless Entry Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K84 Keyless Entry Control Module.

• If less than 1 V

Note: When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.

3. Vehicle OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX function.

4. Activate the antenna by pressing the S83 Vehicle On/Off Switch.

5. Verify the MAX voltage captured by the DMM is greater than 1 V.

• If 1 V or less

1. Vehicle OFF, disconnect the harness connector at the K84 Keyless Entry Control Module.

2. Test for infinite resistance between the signal circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K84 Keyless Entry Control Module.

• If greater than 1 V

6. Test for less than 1 V between the low reference circuit terminal 2 and ground.

• If 1 V or greater

1. Vehicle OFF, disconnect the harness connector at the K84 Keyless Entry Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the low reference circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K84 Keyless Entry Control Module.

• If less than 1 V

Note: When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.

7. Install a DMM between the signal circuit terminal 1 and the low reference circuit terminal 2. Set the DMM to capture DC voltage using the MIN MAX function.

8. Activate the antenna by pressing the S83 Vehicle On/Off Switch.

9. Verify the MAX voltage captured by the DMM is greater than 1 V.

• If 1 V or less

1. Vehicle OFF, disconnect the harness connector at the K84 Keyless Entry Control Module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K84 Keyless Entry Control Module.

• If greater than 1 V

10. Replace the T10J Center Console Front Keyless Entry Antenna.

11. Activate the antenna by pressing the S83 Vehicle On/Off Switch.

12. Verify DTC B3122 is not set as current.

• If DTC B3122 is set as current
Replace the K84 Keyless Entry Control Module.

• If DTC B3122 is not set or is set as history

13. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Ignition Lock Key Transmitter Antenna Replacement - Instrument Panel Ignition Lock Key Transmitter Antenna Replacement - Instrument Panel

* Control Module References Programming and Relearning for Keyless Entry Control Module replacement, programming, and setup