B3120

DTC B3120

CIRCUIT DESCRIPTION
The keyless entry antenna - right is located in the right hand door pull handle and is used as a short range low frequency (LF) antenna. As a vehicle with locked doors is approached with a valid keyless entry transmitter, and the exterior door handle is pulled, the keyless entry antenna broadcasts a challenge to the transmitter in approximately a 1 meter range. If the response from the transmitter via radio frequency (RF) is valid, then the locked door will be passively unlocked/unlatched and allow the door to be opened.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B3120 Keyless Entry Antenna 2 Performance




This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description

CONDITIONS FOR SETTING THE DTC
The remote control door lock receiver (RCDLR) will set this DTC during antenna authentication if the keyless entry antenna - right is open, shorted to battery positive voltage, or shorted to ground. The RCDLR can only set a DTC when the vehicle system voltage is between 9-16 volts.

ACTION TAKEN WHEN THE DTC SETS
The RCDLR will set and store DTC B3120 Keyless Entry Antenna 2 Performance.

CONDITIONS FOR CLEARING THE DTC
- The RCDLR no longer detects an open, short to power, or short to ground on the antenna circuit.
- The use of a scan tool.

TEST DESCRIPTION

Step 1 - Step 9:

Step 10 - Step 12:

The numbers below refer to the step numbers on the diagnostic table.
2. Verifies that DTC B3120 is a current DTC.
3. Verifies that the passenger door handle is operating properly. A valid input from the passenger door handle is required by the RCDLR to authenticate the antenna.
4. Testing for power and ground to the keyless entry antenna.