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Home >> Lexus >> 2012 >> IS 250C V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Testing and Inspection >> Pinout Values and Diagnostic Parameters >> Smart Access System With Push-Button Start (for Start Function)
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Smart Access System With Push-Button Start (for Start Function)





THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): TERMINALS OF ECU

1. CHECK POWER SOURCE CONTROL ECU





(a) Disconnect the J55 ECU connector.

(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 on the wire harness side.

(c) Reconnect the J55 ECU connector.

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









* *1: Voltage is output only when the engine is cranking.

* *2: Voltage is output for 0.3 seconds when the engine starts cranking. Disconnect the A5 connector from the ECM before measuring the voltage.

* *3: for AT

* *4: for MT

If the result is not as specified, the ECU may have a malfunction.

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

(1) Waveform 1





Waveform 1 (Reference)





HINT
As the vehicle speed increases, the wavelength shortens.

(2) Waveform 2





Waveform 2 (Reference)





HINT
As the engine speed increases, the wavelength shortens.

(3) Waveform 3





Waveform 3 (Reference)





2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)





(a) Disconnect the P33 ECU connector.

(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 on the wire harness side.

3. CHECK ECM





(a) Disconnect the A5, E3, E4, E5 and E6 ECM 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 on the wire harness side.

(c) Reconnect the A5, E3, E4, E5 and E6 ECM connectors.

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





* *1: for 2GR-FSE

* *2: for 4GR-FSE

* *3: for AT

* *4: for MT

If the result is not as specified, the ECM may have a malfunction.

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





Waveform 1 (Reference)





HINT
As the engine speed increases, the wavelength shortens.

4. CHECK STEERING LOCK ECU





(a) Disconnect the J29 ECU connector.

(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 on the wire harness side.

(c) Reconnect the J29 ECU connector.

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





* If the result is not as specified, the ECU may have a malfunction.
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