DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ELECTRICAL KEY OSCILLATOR)
CHECK AND REPLACE ELECTRICAL KEY OSCILLATOR
PERFORM ACTIVE TEST BY INTELLIGENT TESTER (CERTIFICATION ECU OUTPUT SIGNAL)
ENTRY AND START SYSTEM - Room Oscillator Circuit
DESCRIPTION
The certification ECU activates the front and rear cabin oscillators. The power is supplied from the certification ECU to both the front and rear cabin oscillators. The front and rear cabin oscillator circuits have the same wiring. If the smart access system with push-button start does not operate properly inside the vehicle, check the circuit for their oscillators.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.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 |
| P33-12 (CG5B) - P15-3 (CLGB) | Always | Below 1 Ω |
| P33-11 (CLG5) - P15-1 (CLG3) | Always | Below 1 Ω |
| P33-14 (CG6B) - Q30-3 (CLGB) | Always | Below 1 Ω |
| P33-13 (CLG6) - Q30-1 (CLG4) | Always | Below 1 Ω |
| P33-12 (CG5B) - Body ground | Always | 10 kΩ or higher |
| P33-11 (CLG5) - Body ground | Always | 10 kΩ or higher |
| P33-14 (CG6B) - Body ground | Always | 10 kΩ or higher |
| P33-13 (CLG6) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 2.CHECK AND REPLACE ELECTRICAL KEY OSCILLATOR |
Replace the electrical key oscillator.
Check that the entry LOCK / UNLOCK function operates normally.
- OK:
- Entry LOCK / UNLOCK function operates normally.
| | END (ELECTRICAL KEY OSCILLATOR IS DEFECTIVE) |
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| 3.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (CERTIFICATION ECU OUTPUT SIGNAL) |
Reconnect the oscillator and the ECU connectors.
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Following the display on the tester, select the "ACTIVE TEST".
SMART KEY (Certification ECU):| Item | Vehicle Condition/Test Details |
| Fr Transmitter | Electrical key Oscillator (console) ON/OFF |
| Rr Transmitter | Electrical key Oscillator (rear seat) ON/OFF |
Measure the frequency according to the value(s) in the table below.
- Standard:
| Tester Connection (Symbols) | Condition | Specified Condition |
| P33-12 (CG5B) - P33-11 (CLG5) | During ACTIVE TEST | Frequency is generated (higher than 0 Hz) |
| P33-14 (CG6B) - P33-13 (CLG6) | During ACTIVE TEST | Frequency is generated (higher than 0 Hz) |
| | 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
