DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE OF INTELLIGENT TESTER
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ELECTRICAL KEY OSCILLATOR)
CHECK AND REPLACE ELECTRICAL KEY OSCILLATOR (CHECK OPERATION OF OSCILLATOR)
INSPECT CERTIFICATION ECU
ENTRY AND START SYSTEM - Touch Sensor Circuit
DESCRIPTION
This circuit receives the signal indicating whether or not a touch sensor signal is detected.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE OF INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Following the display on the tester, select "DATA LIST".
SMART KEY (Certification ECU):| Item | Measurement Item/Range (Display) | Normal Condition | Diagnostic Note |
| D Touch Sensor | Status of touch sensor front LH/ ON or OFF | ON: Touch sensor is touched
OFF: Touch sensor is not touched | - |
| P Touch Sensor | Status of touch sensor front RH/ ON or OFF | ON: Touch sensor is touched
OFF: Touch sensor is not touched | - |
- OK:
- "ON" (screen is touched) or "OFF" (screen is not touched) appears on the tester screen.
| | PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
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| 2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ELECTRICAL KEY OSCILLATOR) |
Disconnect the P33 ECU connector.
Disconnect the oscillator connectors.
- Standard resistance:
| Tester Connection (Symbols) | Condition | Specified Condition |
| P33-5 (SEL1) - o2-4 (SEL) | Always | Below 1 Ω |
| P33-22 (SEN1) - o2-6 (SENS) | Always | Below 1 Ω |
| P33-6 (SEL2) - n2-4 (SEL) | Always | Below 1 Ω |
| P33-23 (SEN2) - n2-6 (SENS) | Always | Below 1 Ω |
| P33-5 (SEL1) - Body ground | Always | 10 kΩ or higher |
| P33-22 (SEN1) - Body ground | Always | 10 kΩ or higher |
| P33-6 (SEL2) - Body ground | Always | 10 kΩ or higher |
| P33-23 (SEN2) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 3.CHECK AND REPLACE ELECTRICAL KEY OSCILLATOR (CHECK OPERATION OF OSCILLATOR) |
Replace the door oscillator.
Check that the entry UNLOCK function operates normally.
- OK:
- Entry UNLOCK function operates normally.
| | END (ELECTRICAL KEY OSCILLATOR IS DEFECTIVE) |
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| 4.INSPECT CERTIFICATION ECU |
Reconnect the ECU and the oscillator connectors.
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection (Symbols) | Condition | Specified Condition |
| SEL1 (P33-5) - Body ground | Move the key more than 5 m (16.4 ft) away from the front door LH | 10 to 14 V |
| SEL1 (P33-5) - Body ground | Bring it to the outside handle | Below 1 V |
| SEL2 (P33-6) - Body ground | Move the key more than 5 m (16.4 ft) away from the front door RH | 10 to 14 V |
| SEL2 (P33-6) - Body ground | Bring it to the outside handle | Below 1 V |
| SEN1 (P33-22) - Body ground | Front door LH outside handle is not held | 10 to 14 V |
| SEN1 (P33-22) - Body ground | Front door LH outside handle is held | Below 1 V |
| SEN2 (P33-23) - Body ground | Front door RH outside handle is not held | 10 to 14 V |
| SEN2 (P33-23) - Body ground | Front door RH outside handle is held | Below 1 V |
| | REPLACE CERTIFICATION ECU |
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| OK | |
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| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
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LEXUS IS250, IS220d / GSE20 ALE20
