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 MANUALSLEXUS2010LX 570 V8-5.7L (3UR-FE)REPAIR AND DIAGNOSISACCESSORIES AND OPTIONAL EQUIPMENTANTITHEFT AND ALARM SYSTEMSTESTING AND INSPECTIONPINOUT VALUES AND DIAGNOSTIC PARAMETERSENGINE IMMOBILISER SYSTEM
2010 Lexus LX 570 V8-5.7L (3UR-FE)
Engine Immobiliser System
2010 Lexus LX 570 V8-5.7L (3UR-FE)SECTION Engine Immobiliser System
THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: TERMINALS OF ECU
1. CHECK ENGINE SWITCH
(a) Disconnect the E18 switch connector.
(b) Measure the 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 E18 switch connector.
(d) Measure the resistance and voltage according to the value(s) in the table below.
HINT
*: Remove the key battery before performing this inspection.
* If the result is not as specified, the switch may have a malfunction.
(e) Using an oscilloscope, check waveform 1.
HINT
*: Remove the key battery before performing this inspection.
(f) Using an oscilloscope, check waveform 2.
HINT
*: Remove the key battery before performing this inspection.
2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
(a) Disconnect the E29 ECU connector.
(b) Measure the resistance and voltage 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 ECU connector.
(d) Measure the resistance and voltage according to the value(s) in the table below.
HINT
*: Remove the key battery before performing this inspection.
* If the result is not as specified, the ECU may have a malfunction.
(e) Using an oscilloscope, check waveform 1.
HINT
*: Remove the key battery before performing this inspection.
(f) Using an oscilloscope, check waveform 2.
HINT
*: Remove the key battery before performing this inspection.
3. CHECK ID CODE BOX (IMMOBILISER CODE ECU)
(a) Disconnect the E28 box connector.
(b) Measure the resistance and voltage 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 E28 box connector.
(d) Measure the voltage according to the value(s) in the table below.
* If the result is not as specified, the ID code box (immobiliser code ECU) may have a malfunction.
(e) Using an oscilloscope, check waveform 1.
(f) Using an oscilloscope, check waveform 2.
4. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)
(a) Disconnect the 2D and 2A ECU connectors.
(b) Measure the resistance and voltage 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.
5. CHECK STEERING LOCK ACTUATOR (STEERING LOCK ECU)
(a) Disconnect the E26 ECU connector.
(b) Measure the resistance and voltage 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.
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.