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Home >> Buick >> 2013 >> Verano L4-2.0L Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B3124

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, the Keyless Entry Control Module communicates with the rear compartment antenna.

Conditions for Running the DTC

Pressing the ignition mode switch.

Conditions for Setting the DTC

B3124 02

The Keyless Entry Control Module detects a short to ground on the rear compartment keyless entry antenna signal circuit.

B3124 05

The Keyless Entry Control Module detects a short to B+ or an open on the rear compartment 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 ignition modes when ignition mode 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 Outside Rearview Mirror - Driver

Description and Operation

Keyless Entry System Description and Operation (without BTM) Keyless Entry System Description and Operation (without BTM)Keyless Entry System Description and Operation (with BTM) Keyless Entry System Description and Operation (with BTM)

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 Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the T10E Keyless Entry Antenna - Rear Compartment, ignition ON.

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

• If 1 V or greater

1. Ignition OFF, disconnect the harness connector at the K84 Keyless Entry Control Module, ignition ON.

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. Ignition OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX function. Turn off autorange and manually set the DMM range to 000.0 V.

4. Activate the antenna by pressing the ignition mode switch.

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

• If 1 V or less

1. Ignition 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. Ignition OFF, disconnect the harness connector at the K84 Keyless Entry Control Module, ignition ON.

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. Turn off autorange and manually set the DMM range to 000.0 V.

8. Activate the antenna by pressing the ignition mode switch.

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

• If 1 V or less

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

2. Test for infinite resistance between the low reference 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 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 T10E Keyless Entry Antenna - Rear Compartment.

11. Activate the antenna by pressing the ignition mode switch.

12. Verify DTC B3124 is not set.

• If DTC B3124 is set
Replace the K84 Keyless Entry Control Module.

• If DTC B3124 is not set

13. All OK.

Repair Instructions

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

* Ignition Lock Key Transmitter Antenna Replacement - Rear Compartment Ignition Lock Key Transmitter Antenna Replacement - Rear Compartment

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

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