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 System Check
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. On the HDS screen, at SYSTEM SELECTION MENU, enter ONE-PUSH START, then select KEYLESS ACCESS CONTROL UNIT or BACKUP CONTROL UNIT.
NOTE: If the HDS does not communicate, check the keyless access/TPMS control unit power, ground, K-line, and L-line connectors.
4. At KEYLESS ACCESS CONTROL UNIT, enter KEYLESS ACCESS SYSTEM INFORMATION, then select SYSTEM CHECK 1 or SYSTEM CHECK 2.
5. At BACKUP CONTROL UNIT, enter SYSTEM INFORMATION, then select SYSTEM CHECK.
6. If the HDS displays NORMAL N-1, the immobilizer system is OK at this time, refer to the STATUS LOG. If the HDS displays any other messages, check as follows:
System Check 1 (Keyless Access/TPMS Control Unit)
| System Check No. | Possible cause | Check items |
|---|---|---|
| A-1 A-2 A-3 G-4 |
|
|
| B-1 B-2 G-1 |
|
|
| C-1 C-2 G-2 G-3 |
|
|
| C-3 C-4 |
|
|
| G-5 |
|
|
*1: Without electric steering lock
*2: With electric steering lock
*3: With remote engine start
*4: V6 engine
System Check 2 (Keyless Access/TPMS Control Unit)
| System Check No. | Possible cause | Check items |
|---|---|---|
| D-1 D-2 D-3 |
|
|
| D-4 D-5 |
IGN TRX line trouble *2/*1*3 | Check IGN TRX line *2/*1*3 |
*1: Without electric steering lock
*2: With electric steering lock
*3: V6 engine
System Check (Backup Control Unit)
| System Check No. | Possible cause | Check items |
|---|---|---|
| A-1 A-2 A-3 |
|
|
| B-1 B-2 |
|
|
| C-1 C-2 |
|
|
| D-1 D-2 D-3 |
|
|
| E-1 E-2 E-3 E-4 E-5 |
Keyless Access/TPMS Control Unit is not registered | Register the Keyless Access/TPMS Control Unit |
| F-1 F-2 F-3 F-4 F-5 |
Special Mode | Turn the vehicle to the ON mode and then select the OFF (LOCK) mode with a registered keyless remote |
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.