Push Button Start System - Diagnosis: Other Toyota Prius II

PRECAUTION

NOTICE FOR INITIALIZATION

When disconnecting the negative (-) battery terminal, initialize the Power Window Control System after the terminal is reconnected.

NOTICE FOR HYBRID SYSTEM ACTIVATION

1. When the warning lamp is illuminated or the battery has been disconnected and reconnected, pressing the power switch may not start the system on the first try. If so, press the power switch again.
2. When the power source control ECU is replaced with a new ECU and the battery's negative terminal is reconnected, the power switch automatically turns ON (IG). However, when the power source control ECU is removed and then reinstalled, the power switch remains in the same mode as when the ECU was removed.

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1. 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 primarily 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 cooperation 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. *: w/ Smart entry system BRAKE PEDAL POWER SWITCH OPERATION Brake Pedal Power Switch Operation Released Power mode changes OFF, ON (ACC), ON (IG) and OFF, every time power switch is pressed Depressed Power mode changes to ON (READY) from any power mode
2. FUNCTION OF COMPONENT
3. SYSTEM FUNCTION The electric controls of the push button start system are described below
4. 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. As a result, the power mode changes to the mode selected by power switch operation. Every time the power switch is pushed, the power mode changes between stages in this order: OFF, ON (ACC), ON (IG) and OFF. If the driver pushes the power switch while depressing the brake pedal (the stop light switch turns ON), 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: 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).
5. 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.