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DTC B3123

DTC B3123

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 B3123 02

Keyless Entry Antenna 5 Short to Ground

DTC B3123 05

Keyless Entry Antenna 5 High Voltage/Open

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Keyless Entry Antenna Signal - Center Console Rear B3123 02 B3123 05 B3123 05 -
Keyless Entry Antenna Low Reference - Center Console Rear - B3123 05 - -


Circuit/System Description

The rear center console antenna is located in rear of the center console assembly 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 center console 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.

• The last door becomes closed.

• Pressing the start/stop switch.


Conditions for Setting the DTC

B3123 02

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

B3123 05

The keyless entry control module detects a short to B+ or an open on the rear 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 ignition modes when start/stop button 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 (without ATH) Keyless Entry System Description and Operation (with 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


1. Ignition OFF, disconnect the harness connector at the T10K center console rear keyless entry antenna.

2. Ignition ON, test for less than 1 V between the signal circuit terminal 1 and ground.

3. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K84 keyless entry control module.

4.
Note

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


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.

5. Activate the antenna by pressing the ignition mode switch. Verify the MAX voltage captured by the DMM is greater than 1.0 V.

6. If less than the specified range, 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.

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

8. If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the K84 keyless entry control module.

9.
Note

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


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.

10. Activate the antenna by pressing the ignition mode switch. Verify the MAX voltage captured by the DMM is greater than 1.0 V.

11. If less than the specified range, test the low reference circuit for an open circuit/high resistance. If the circuit tests normal, replace the K84 keyless entry control module.

12. If the test results for all circuits are normal, replace the T10K rear keyless entry antenna in the center console. Verify that DTC B3123 is not set.

13. If the DTC is set, replace the K84 keyless entry control module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Ignition Lock Key Transmitter Antenna Replacement - Floor Console

• Control Module References for keyless entry control module replacement, setup, and programming