Smart Key System (for Start Function)

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

1. CHECK POWER MANAGEMENT CONTROL ECU





(a) Disconnect the A39, I3 and I4 connectors.

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

HINT
Measure the values on the wire harness side with the connector disconnected.





(c) Reconnect the A39, I3 and I4 connectors.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.





HINT
* *1: When the power switch is turned off with the shift lever in P and any of the doors are opened or closed, the steering wheel will be locked. When the power switch is turned on (ACC) or on (IG), the steering wheel will be unlocked.
* *2: When all of the following conditions are met, open any of the doors to operate the steering lock motor.
* The shift lever is in P.
* The power switch is off.
* While carrying the electrical key transmitter sub-assembly, the power switch is turned on (IG) and the steering is unlocked.

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

(1) Waveform 1









Text in Illustration





HINT
When all of the following conditions are met, open any of the doors to operate the steering lock motor.

* The shift lever is in P.
* While carrying the electrical key transmitter sub-assembly, the power switch is turned on (IG) and the steering is unlocked.
* The power switch is off.

(2) Waveform 2









HINT
The wavelength becomes shorter as the vehicle speed increases.