Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2012CT 200H L4-1.8L (2ZR-FXE) HYBRIDREPAIR AND DIAGNOSISACCESSORIES AND OPTIONAL EQUIPMENTANTITHEFT AND ALARM SYSTEMSTESTING AND INSPECTIONPINOUT VALUES AND DIAGNOSTIC PARAMETERSSMART ACCESS SYSTEM WITH PUSH-BUTTON START (FOR START FUNCTION)
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) Hybrid
Smart Access System With Push-Button Start (For Start Function)
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) HybridSECTION 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
HINT
For the layout of the certification ECU (smart key ECU assembly) terminals, refer to the following Smart Access System With Push-Button Start (For Entry Function).
1. CHECK POWER MANAGEMENT CONTROL ECU
(a) Disconnect the A20, H3 and H4 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 A20, H3 and H4 connectors.
(d) Measure the voltage and check for pulses according to the value(s) in the table below.
(e) Using an oscilloscope, check the signal waveform of the ECU.
(1) Waveform 1
(2) Waveform 2
HINT
The wavelength becomes shorter as the vehicle speed increases.
(3) Waveform 1 (Reference)
Text in Illustration
Measurement Condition
(4) Waveform 2 (Reference)
Text in Illustration
Measurement Condition
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.