Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Keyless Access LF Antenna Function Test
NOTE:
- Before testing, check for DTCs. If any DTCs are indicated, troubleshoot the indicated DTCs first.
- Some models have the rear outer handle touch sensor. Perform the troubleshooting flow where applicable.
1. Connect the HDS to the data link connector (DLC) - Refer to: How to Troubleshoot the Fuel and Emissions Systems (L4), or How to Troubleshoot the Dual Clutch Transmission (DCT), or How to Troubleshoot the Brake Booster Pressure Monitoring System (With Auto Idle Stop System), or How to Troubleshoot the Fuel and Emissions Systems (V6, Without Auto Idle Stop System), or How to Troubleshoot the Fuel and Emissions Systems (V6, With Auto Idle Stop System) .
2. Turn the vehicle to the ON mode.
3. Select KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS.
4. Select the SELF CHECK and if any malfunction is found, troubleshoot it first.
5. Select the FUNCTIONAL TESTS, and do the antenna driving test by checking the transmitting areas (A) between the LF antenna and the keyless remote.
| LF Antenna Location | HDS Indication (Functional Tests) |
|---|---|
| Left-front LF antenna/initiator | Driver (Door) Antenna Driving |
| Right-front LF antenna/initiator | Front Passenger (Door) Antenna Driving |
| Left-rear LF antenna/initiator | Driver Side Rear (Door) Antenna Driving |
| Right-rear LF antenna/initiator | Passenger Side Rear (Door) Antenna Driving |
NOTE:
- Functional Tests cannot operate at the same time, check the LF antennas one at a time.
- Test the transmitting area at about 90 cm (35.4 in) height from the ground.
- The LED will blink when the keyless remote is within the shaded areas.
6. Select the FUNCTIONAL TESTS, and do the antenna driving test by checking the transmitting areas (A) between the LF antenna and the keyless remote (except on the dashboard, in the glove box, door pockets, console box, and other enclosed areas).
| LF Antenna Location | HDS Indication (Functional Tests) |
|---|---|
| Front interior LF antenna | Front Interior Antenna Driving |
| Rear interior LF antenna | Rear Interior Antenna Driving |
NOTE: Functional Tests cannot operate at the same time, check the LF antennas one at a time.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.