Keyless Entry Transmitter Malfunction

Ignition ON.
Verify that DTC B3119, B3120, B3121, B3122, B3123, or B3124 is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If none of the DTCs are set
Verify the Tire Pressure Monitoring System is functioning by adding air to one tire to see the air pressure display increase.
- If the pressure does not increases
  Refer to Symptoms - Tire Pressure Monitoring
- Go to next step: If the pressure increases
Verify the VIN information for the vehicle transmitter is correct using the EL-52545 .
- If the VIN is blank
  Refer to Remote Control Door Lock and Theft Deterrent Transmitter Programming .
- If the VIN is incorrect
  This transmitter is not for this vehicle, it may already be programmed to work with a different vehicle but cannot be programmed to this vehicle.
- Go to next step: If the VIN is correct
Verify the frequency of the transmitter matches the frequency of the tire pressure monitoring system and the remote control door lock receiver using the EL-52545 .
- If the transmitter frequency is incorrect
  Replace the vehicle transmitter.
- Go to next step: If the transmitter frequency is correct
Verify the part number information for the vehicle transmitter is correct using the EL-52545 .
- If the vehicle transmitter part number is incorrect
  Replace the vehicle transmitter.
- Go to next step: If the vehicle transmitter part number is correct
Verify the transmitter output is above 20% on the EL-52545 signal strength meter by pressing a button on the transmitter ten times.
- If the transmitter output is lower than 20%
  Replace the transmitter battery.
- Go to next step: If the transmitter output is higher than 20%
Using the scan tool read the number of transmitters learned in the K9 Body Control Module. Using the EL-52545 read the number of transmitters learned in the transmitter.
- If the transmitters learned is less than the number programmed
  Program the transmitter. Refer to Remote Control Door Lock and Theft Deterrent Transmitter Programming .
- Go to next step: If the transmitters learned is equal to the number programmed
Using the EL-52545 verify the transmitter is responding to the antenna by placing the transmitter next to the EL-52545 and pressing the start/stop button. The EL-52545 should display a high frequency (315 MHz or 433 MHz) reading when the start/stop button is pressed.
- If the high frequency (315 MHz or 433 MHz) response does not display
  Program the transmitter. Refer to Remote Control Door Lock and Theft Deterrent Transmitter Programming .
1. Using the EL-52545 verify the transmitter is responding to the antenna by placing the transmitter next to the EL-52545 and pressing the start/stop button. The EL-52545 should display a high frequency (315 MHz or 433 MHz) reading when the start/stop button is pressed.
  - If the high frequency (315 MHz or 433 MHz) does not display. Replace the vehicle transmitter
- Go to next step: If the high frequency (315 MHz or 433 MHz) does display
Verify the scan tool Exterior Driver Door Handle Switch, Exterior Passenger Door Handle Switch, and Trunk Lid Exterior Unlatch Switch parameters change between Active and Inactive while operating their respective exterior door handle/rear closure touch pad.
- If any of the parameters does not change
  Refer to Exterior Door Handle Switch Malfunction , or Liftgate Release Malfunction
- Go to next step: If all of the parameters change
Lock the vehicle using the keyless entry transmitter.
Verify that each door and the rear compartment unlocks and opens by approaching the vehicle with a valid transmitter and operating their respective exterior door handle/rear closure touch pad.
- If both doors and the rear compartment do not unlock/unlatch and open
  Refer to Remote Control Door Lock Receiver Malfunction in Circuit/System Testing above.
- If only one door or the rear compartment does not unlock/unlatch and open
  Refer to Keyless Entry Antenna Circuit Malfunction in Circuit/System Testing above.
- Go to next step: If both doors and the rear compartment unlocks/unlatches and opens
All OK.
The concern may be caused by temporary RF interference. Discuss the conditions in which the concern occurs with the customer. RF interference from aftermarket devices such as 2-way radios, power inverters, cellular phone chargers, computers, etc. may cause a system malfunction. High RF traffic areas, such as gas stations which use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction.