System Description

CHECK PUSH BUTTON START SYSTEM DESCRIPTION

The push button start system uses a push-type power switch, which the driver operates by inserting a key into the key slot or by merely carrying the key*. This system consists of a power source control ECU, power switch, key slot, key, ACC relay, IG1 relay, IG2 relay and transponder key ECU. The power source control ECU controls the system. This system operates in conjunction with the engine immobilizer system and the smart entry system*.

The table below shows the transition of the power switch, which depends on whether the brake pedal is depressed or released.

HINT:

*: w/ Smart entry system

BRAKE PEDAL REFERENCE

Brake Pedal	Power Switch Operation
Released	Power mode changes between OFF, ON (ACC) and ON (IG) power switch is pressed
Depressed	Power mode changes to ON (READY) from any power mode

FUNCTION OF COMPONENT

Fig 1: Component Function Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

*: w/ Smart entry system
SYSTEM FUNCTION
The electric controls of the push button start system are described below:

Fig 2: Electric Controls Of Push Button Start System Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
POWER SWITCH CONTROL (WITH KEY)
- When a key is inserted into the key slot and the transponder key ECU recognizes the ID code of the key, the power source control ECU authorizes operation of the power switch.
- A power mode (OFF, ON (ACC) and ON (IG)) can be selected by pressing the power switch. Press, release and press the power switch until the desired power mode is selected (the power mode cycle in the order shown above). If the driver pushes the power switch while depressing the brake pedal (the stop lamp switch turns ON), the power mode will change to ON (READY) regardless of the previous power mode.
- After approximately 1 hour has passed with the power switch at ON (ACC) and the shift position in P, the power source control ECU will automatically turns OFF the power (the power mode changes to OFF).
- The illustration below shows the transition of power modes.
  Transition of power mode:
  
  Fig 3: Transition Power Mode Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:

While the vehicle is being driven normally, operation of the power switch is disabled. However, if the hybrid control system must be stopped in an emergency while the vehicle is being driven, pressing the power switch for at least 3 seconds can stop the hybrid control system. Power mode changes from ON (READY) to ON (ACC).
DIAGNOSIS
If a malfunction occurs in the IG circuit, the power source control ECU will perform the controls listed in the table below and record a DTC.

Fig 4: IG Circuit Malfunction Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002