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2016 – MX-5 – Body and Accessories

PUSH BUTTON START SYSTEM [KEYLESS ENTRY SYSTEM]

Outline

• A push button start system has been adopted that automatically performs authorization of the remote transmitter being brought within the request signal output range of the keyless antennas.

Function

• When the bush button start is pressed, the push button start system performs authorization of the remote transmitter in the vehicle.

• Engine start: When authorization of the remote transmitter is completed with the engine-start conditions met, the engine is started.

• The guidance function notifies the user of the push button start system conditions using the KEY indicator/warning lights in the instrument cluster to help the user’s operation.

Structural View

System Wiring Diagram

Operation

Remote transmitter authorization

1. When the push button start is pressed, a push button start signal is input (1) to the start stop unit.

2. When the start stop unit detects a push button start signal, it outputs (2) a request signal via the keyless antennas.

3. The remote transmitter receives the request signal from the keyless antennas, and sends (3) ID data to the keyless receiver.

4. The keyless receiver transmits (4) the received ID data to the start stop unit.

5. The start stop unit verifies the ID data and if it matches, the power supply is switched to turn the push button start indicator light (amber) on. For details on the power supply switching, refer to the [POWER SUPPLY SWITCHING]. (See POWER SUPPLY SWITCHING.)

Engine start

• When the push button start is pressed with all the following conditions met, authorization of the remote transmitter is performed to start the engine.

Engine start conditions

• Clutch pedal position switch and starter interlock switch on signals (clutch pedal depressed) detected (MT)

• Brake light switch on signal (brake pedal depressed) detected (AT)

• P or N position signal from selector lever (selector lever at P or N position) received (AT)

• Remote transmitter is within request signal output range of keyless antennas in vehicle interior

Engine emergency stop

• If a push button start on signal is input for 3 s or more (ignition switch held pressed) or 3 times within 1.5 s with the engine running, the start stop unit switches the ignition to ACC or OFF according to the position of the shift lever (MT)/selector lever (AT).

Back-up mode (MT) for engine-start

• If the start stop unit determines that either the clutch pedal position switch or starter interlock switch is malfunctioning, the system switches to back-up mode.

• If the push button start is pressed when all the following conditions are met while in the back-up mode, the remote transmitter authorization is performed and the engine starts.

• Start stop unit detects that either clutch pedal position switch or starter interlock switch is on

• Neutral switch signal is received via CAN communication from PCM

• Remote transmitter is within request signal output range of keyless antennas in vehicle interior

Guidance function

Display of methods for resolving issues

• Under the following conditions, the start stop unit sends a warning request signal via CAN transmission to the instrument cluster. It also flashes the push button start indicator (green).

• The instrument cluster illuminates/flashes the KEY indicator light/KEY warning light when it receives the warning request signal.

Condition	Instrument cluster		Push button start
	KEY indicator light (green)	KEY warning light (red)	Indicator light (green)	Indicator light (amber)
Engine start conditions are met	On	???	On	???
ID verification is not acceptable	???	Flash	???	Flash

*1

For the keyless warning alarm sound pattern, refer to the [KEYLESS WARNING ALARM]. (See KEYLESS WARNING ALARM.)

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