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.
System Description
SYSTEM DESCRIPTION
- PDS (POWER DISTRIBUTION SYSTEM) is the system that BCM controls with the operation of the push-button ignition switch and performs the power distribution to each power circuit. This system is used instead of the mechanical power supply changing mechanism with the operation of the conventional key cylinder.
- The push-button ignition switch can be operated when Intelligent Key is in the following condition. Refer to Engine Start Function for details.
- Intelligent Key is in the detection area of the inside key antenna.
- Intelligent Key backside is contacted to push-button ignition switch.
- The push-button ignition switch operation is input to BCM as a signal. BCM changes the power supply position according to the status and operates the following relays to supply power to each power circuit.
- Ignition relay (inside IPDM E/R)
- Ignition relay-1
- ACC relay
- Blower relayNOTE: The engine switch operation changes due to the conditions of brake pedal, selector lever and vehicle speed.
- The power supply position can be confirmed with the lighting of the indicators near the push-button ignition switch.
IGNITION BATTERY SAVER SYSTEM
When all the following conditions are met for a period of time, the battery saver system will cut off the power supply (ignition switch ON/ACC → OFF) to prevent battery discharge.
- Ignition switch is in the ACC or ON position
- Turn signal lamp is not in operation
- Selector lever is in the P (park) position
Reset Condition of Ignition Battery Saver System
If any of the following conditions are met, the battery saver system is released.
- Ignition switch is not in the ACC or ON position
- Turn signal lamp is in operation
- Selector lever is not in the P (park) position
POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERATION
The power supply position changing operation can be performed with the following operations.
- When an Intelligent Key is within the detection area of inside key antenna and when Intelligent Key backside is contacted to push-button ignition switch, it is equivalent to the operations below.
- When starting the engine, the BCM monitors under the engine start conditions,
- Brake pedal operating condition
- Selector lever position
- Vehicle speed
Vehicle speed: less than 4 km/h (2.5 MPH)
| Power supply position | Engine start/stop condition | Push-button ignition switch operation frequency | |
|---|---|---|---|
| Selector lever position | Brake pedal operation condition | ||
| OFF → ACC | - | Not depressed | 1 |
| OFF → ACC → ON | - | Not depressed | 2 |
| OFF → ACC → ON → OFF | - | Not depressed | 3 |
| OFF → START ACC → START ON → START |
P or N position | Depressed | 1 |
| Engine is running → OFF | - | - | 1 |
Vehicle speed: 4 km/h (2.5 MPH) or more
| Power supply position | Engine start/stop condition | Push-button ignition switch operation frequency | |
|---|---|---|---|
| Selector lever position | Brake pedal operation condition | ||
| Engine is running → ACC | - | - | Emergency stop operation |
| Engine stall return operation while driving | N position | Not depressed | 1 |
Emergency stop operation
- Press and hold the push-button ignition switch for 2 seconds or more.
- Press the push-button ignition switch 3 times or more within 1.5 seconds.
NO RELATED
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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.