Smart Key System (For Start Function) (Diagnostics - Introduction): Other Toyota 4Runner V

PRECAUTION

1. NOTICE FOR INITIALIZATION NOTE: When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION»(ref-421949-S36027747902011092600000) .
2. PRECAUTIONS FOR PUSH-BUTTON START FUNCTION Before starting the engine, firmly depress the brake pedal until the indicator in the engine switch turns green. The power source mode (off, on (ACC), on (IG)) is always retained in memory by the vehicle. If the battery is disconnected, the power source mode that was selected before disconnection will be restored after the battery is reconnected. Be sure to turn the engine switch off before disconnecting the cable from the negative-battery terminal. Be careful if the power source mode of a vehicle with a discharged battery is not known. After the battery is reconnected, be sure to wait 10 seconds or more before attempting to start the engine. The engine may not start immediately after the battery is reconnected. When the key battery is depleted and the key is held against the engine switch to start the engine system, the following warning alarms will sound. The driver side door is opened and closed. Shift lever in P power source cut reminder exit warning Shift lever not in P power source cut reminder exit warning A door other than the driver side door is opened and closed: Occupant leaves with key warning The warning alarms do not indicate an actual malfunction. The alarms sound because the key battery is depleted and the system cannot determine if the key is inside the vehicle or not.

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COMMUNICATION TABLE

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1. PUSH-BUTTON START DESCRIPTION The push-button start function uses a push-type engine switch, which the driver can operate by merely carrying the key. This system consists primarily of the power management control ECU, engine switch, ID code box, steering lock ECU, key, ACC relay, IG1 relay, IG2 relay and certification ECU. The power management control ECU controls the system. This function operates in cooperation with the smart key system.
2. FUNCTION OF COMPONENT Component Function Engine switch - Transponder key amplifier Informs the driver of a power source mode or system abnormality with the illumination state of the indicator light. Power management control ECU Changes the power source mode in 4 stages (off, on (ACC), on (IG), start). Controls the indicator light of the engine switch. Activates the starter relay. Certification ECU Performs key verification (checks whether the correct key is present). Controls the security indicator and the illumination of the lettering on the engine switch. Records ECU verification codes. Stop light switch Outputs the state of the brake pedal to the power management control ECU. Park/neutral position switch Outputs the state of the shift lever to the power management control ECU. Shift lock control ECU Outputs a shift lock control ECU signal to the power management control ECU. ID code box Transmits a command to set or cancel the immobiliser to the ECM based on permission signals from the certification ECU. Records ECU verification codes. ECM Receives an engine start request signal from the power management control ECU, turns on the starter relay, and starts the engine. Receives a signal from the ID code box and performs engine ignition and injection.
3. CONSTRUCTION AND OPERATION TEXT IN ILLUSTRATION *1 Indicator Light Engine Switch The engine switch consists of a momentary type switch, color (amber, green) LEDs, and a transponder key amplifier. The amber LED is for illumination. The amber and green LEDs are for the indicator lights. The driver can check the present power source mode and whether the engine can start by checking the illumination state of the indicator light. When the power management control ECU detects an abnormality in the smart key system, it makes the amber indicator light flash. If the engine stopped in this state, it may not be possible to restart it. Indicator Light Condition ENGINE SWITCH INDICATOR LIGHT CONDITION Power Source Mode/Condition Indicator Light Condition Brake pedal released Brake pedal depressed, shift lever in P or N Off Off Turns on (Green) On (ACC) or on (IG) Turns on (Amber) Turns on (Green) Engine running Off Off Steering lock not unlocked Flashes (Green) for 30 sec. Flashes (Green) for 30 sec. System malfunction Flashes (Amber) for 15 sec. Flashes (Amber) for 15 sec. Power Management Control ECU The power management control ECU consists of the IG1 and IG2 relay actuation circuits and CPU. HINT: Before removing the battery, make sure to turn the engine switch off. The power management control ECU constantly stores the present power source mode in its memory. Therefore, if the power management control ECU is interrupted by disconnecting the battery, the power management control ECU restores the power source mode after the battery is reconnected. For this reason, if the battery is disconnected when the engine switch is not off, the power is restored to the vehicle at the same time the power is restored to the power management control ECU (by reconnecting the battery).
4. PUSH-BUTTON START FUNCTION OPERATION This system has different power source mode patterns depending on the brake pedal condition and shift lever position. Brake Pedal Shift Lever Position Power Source Mode Pattern Depressed P or N When the engine switch is pushed once. off --> engine start Not depressed P Each time the engine switch is pushed. off --> on (ACC) --> on (IG) --> off Except P Each time the engine switch is pushed. off --> on (ACC) --> on (IG) --> on (ACC) - P When the engine switch is on (IG) (engine running). on (IG) --> off - Except P When the engine switch is on (IG) (engine running). on (IG) --> on (ACC) When the battery of the key is low or the signal communication is affected by wave noise, the push-button start function can be operated by holding the key against the engine switch. After approximately 1 hour has passed with the engine switch on (ACC) or on (IG) and the shift lever in P, the power management control ECU automatically cuts the power supply (the power source mode changes to off). The illustration below shows the transition of power source modes. Transition of power source mode
5. SYSTEM NOT OPERATING NORMALLY (DUE TO KEY BATTERY DEPLETION, ELECTRICAL NOISE, ETC.) To operate the push-button start function when the key battery is low or the signal communication is affected by wave noise, hold the key against the engine switch with the brake pedal depressed.
6. DIAGNOSIS The power management control ECU can detect malfunctions in the push-button start function when the power source mode is on (IG). When the ECU detects a malfunction, the amber indicator light of the engine switch flashes to warn the driver. At the same time, the ECU stores a 5-digit DTC (Diagnostic Trouble Code) in memory. The indicator light warning continues flashing for 15 seconds even after the power source mode is changed to off. The DTCs can be output by connecting the Techstream to the DLC3. The push-button start function cannot be operated if a malfunction occurs.