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Home >> Lexus >> 2011 >> LX 570 V8-5.7L (3UR-FE) >> 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 MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)





(a) Disconnect the E1, E2 and 2D main body ECU 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 E1, E2 and 2D main body ECU connectors.

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





HINT
*1: Remove the ST CUT relay before measuring the voltage.

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





Reference





HINT
As the vehicle speed increases, the wavelength shortens.

(2) Waveform 2





Reference





(3) Waveform 3





Reference





2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)





(a) Disconnect the E29 certification ECU (smart key ECU assembly) 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 E29 certification ECU (smart key ECU assembly) connector.

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





If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.

3. CHECK ECM





(a) Disconnect the A38 and C53 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 ECM connectors.

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





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

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





Reference





HINT
As the engine speed increases, the wavelength shortens.

4. CHECK STEERING LOCK ECU





(a) Disconnect the E26 steering lock 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 E26 steering lock 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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