Smart Key System (for Start Function)

THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): TERMINALS OF ECU

HINT
* For the layout of the certification ECU (smart key ECU assembly) terminals, refer to the following Smart Key System (for Entry Function).
* For the layout of the ID code box (immobiliser code ECU) terminals, refer to the following Engine Immobilizer System (w/ Smart Key System).
* For the layout of the steering lock ECU terminals, refer to the following Pinout Values and Diagnostic Parameters.

1. CHECK POWER SOURCE CONTROL ECU





(a) Disconnect the C42 and C43 connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.


















If the result is not as specified, there may be a malfunction in the wire harness.

(c) Reconnect the C42 and C43 connectors.

(d) Measure the voltage according to the value(s) in the table below.


































HINT
* *1: When the shift lever is in P (for Automatic Transaxle) and the engine switch is off, if any door is opened or closed, the steering is locked. When the electrical key transmitter is inside the vehicle and the engine switch is turned on (ACC) or on (IG), the steering unlocks.
* *2: When the engine is cranking, the battery voltage may momentarily drop to approximately 6 V.
* *3: The steering lock motor operates when the following conditions are met and a door is opened:
* The shift lever is in P (for Automatic Transaxle).
* While carrying the electrical key transmitter, the engine switch is turned on (IG) to unlock the steering, and then the engine switch is turned off.

(e) Using an oscilloscope, check the waveform of the ECU.

(1) Waveform 1









HINT
The wavelength becomes shorter as the engine speed increases.

(2) Waveform 2









Text in Illustration





(3) Waveform 3









HINT
The wavelength becomes shorter as the vehicle speed increases.