B3122

DTC B3122

Circuit Description

The keyless entry antenna - back up is located in the glove compartment area and is used as a short range low frequency (LF) transmitter. When a valid key fob is within the passenger compartment and the brake pedal is depressed and the ignition button is pressed the keyless entry antenna transmitter broadcasts a challenge within the passenger compartment to the key fob. If the response from the key fob via radio frequency (RF) is a valid response and all the security requirement are met the vehicles engine will start or be able to go into accessory mode.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3122 Keyless Entry Antenna 4 Performance

Conditions for Setting the DTC

The remote control door lock receiver (RCDLR) will set this DTC during antenna activation if the keyless entry antenna - back up is open, or has a high resistance. The RCDLR can only set a DTC when it is the vehicle system voltage is between 9-16 volts.

Action Taken When the DTC Sets

The RCDLR will set and store a DTC B3122.

Conditions for Clearing the DTC

* The RCDLR no longer detects an open or a high resistance on the antenna circuit.
* The use of a scan tool.

Test Description

Step 1 - Step 6:

Step 7 - Step 11:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that DTC B3122 is a current DTC.
3. This step tests for power and ground to the keyless entry antenna.