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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 console active antenna is activated.

Conditions for Setting the DTC

B3122 02

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

B3122 05

The keyless entry control module detects a short to B+ or an open on the console keyless entry active antenna circuit.

Action Taken When the DTC Sets

The vehicle will not start or go into accessory mode.

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 50 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 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. 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.

5. Attempt to start the vehicle. Verify the DMM captured an alternating voltage signal.

6. If an alternating voltage was not captured, test the signal circuit and the low reference circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K84 Keyless Entry Control Module.

7. If all circuits test normal, test or replace the T10J Keyless Entry Antenna - Center Console Front.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming