Volt

DTC B3124

The rear compartment aerial is located on the rear compartment floor near the seat back, centred, 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 aerial.

B3124 02

The keyless entry control module detects a short to ground on the rear compartment keyless entry aerial signal circuit.

B3124 05

The keyless entry control module detects a short to B+ or an open on the rear compartment keyless entry aerial signal circuit.

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 start/stop button is pressed.

Schematic Reference

Remote Function Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the T10E rear compartment keyless entry aerial, ignition ON.
2. Test for less than 1 V between the signal circuit terminal 1 and ground.

⇒	If 1 V or greater

2.1.	Ignition OFF, disconnect the harness connector at the K84 keyless entry control module, ignition ON.

2.2.	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.
4. Lock the vehicle doors using the keyless entry transmitter. Activate the aerial 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

5.1.	Ignition OFF, disconnect the harness connector at the K84 keyless entry control module.

5.2.	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

5.3.	Test for less than 2 Ω in the signal circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, 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

6.1.	Ignition OFF, disconnect the harness connector at the K84 keyless entry control module, ignition ON.

6.2.	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. Lock the vehicle doors using the keyless entry transmitter. Activate the aerial 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

9.1.	Ignition OFF, disconnect the harness connector at the K84 keyless entry control module.

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

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, replace the K84 keyless entry control module.

⇓	If greater than 1 V

10. Replace the T10E rear compartment keyless entry aerial.
11. Lock the vehicle doors using the keyless entry transmitter. Activate the aerial by pressing the ignition mode switch.
12. Verify DTC B3124 is not set as current.

⇒	If DTC B3124 is set as current

Replace the K84 keyless entry control module.

⇓	If DTC B3124 is not set or is set as history

13. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.