General Information: Notes

There are many ECU controlled systems used in LEXUS GX470. In general, ECU controlled system are considered to be very intricate and require a high level of technical knowledge and expert skill to troubleshoot. The fact is, however, that if you proceed by inspecting the circuits one by one, troubleshooting of these systems is not complex. If you have adequate understanding of the system and basic knowledge of electricity, the problem can be accurately diagnosed and fixed. This article is designed based on the above principle to help service technicians perform accurate and effective troubleshooting, and is compiled for the following major ECU controlled systems:

The troubleshooting procedures are described in the following references.

GENERAL INFORMATION REFERENCE TABLE

System	Reference
1. SFI System (2UZ-FE)	SFI SYSTEM (2UZ-FE) - DIAGNOSTICS
2. Electronic Modulated Suspension & Rear Air Suspension System	ELECTRONIC MODULATED SUSPENSION & REAR AIR SUSPENSION SYSTEM - DIAGNOSTICS
3. Kinetic Dynamic Suspension System	KINETIC DYNAMIC SUSPENSION SYSTEM - DIAGNOSTICS
4. Tire Pressure Warning System	TIRE PRESSURE WARNING SYSTEM - DIAGNOSTICS
5. ABS with EBD & BA & TRAC & VSC System	ABS WITH EBD & BA & TRAC & VSC SYSTEM - DIAGNOSTICS
6. Electronic Controlled Automatic Transmission [ECT]	ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION (ECT) - DIAGNOSTICS
7. Power Tilt and Power Telescopic Steering Column	POWER TILT AND POWER TELESCOPIC STEERING COLUMN - DIAGNOSTICS
8. Air Conditioning System	AIR CONDITIONING SYSTEM - DIAGNOSTICS
9. Supplemental Restraint System	SUPPLEMENTAL RESTRAINT SYSTEM
10. Lighting System	LIGHTING SYSTEM - DIAGNOSTICS
11. Wiper and Washer System	WIPER AND WASHER SYSTEM - DIAGNOSTICS
12. Audio System	AUDIO SYSTEM - DIAGNOSTICS
13. LEXUS Navigation System	LEXUS NAVIGATION SYSTEM - DIAGNOSTICS
14. Rear Seat Audio System	REAR SEAT AUDIO SYSTEM - DIAGNOSTICS
15. Rear Seat Entertainment System	REAR SEAT ENTERTAINMENT SYSTEM - DIAGNOSTICS
16. Back Monitor System	BACK MONITOR SYSTEM - DIAGNOSTICS
17. Combination Meter	COMBINATION METER - DIAGNOSTICS
18. Power Window Control System	POWER WINDOW CONTROL SYSTEM - DIAGNOSTICS
19. Power Mirror Control System (w/ memory)	POWER MIRROR CONTROL SYSTEM (W/MEMORY) - DIAGNOSTICS
20. Front Power Seat Control System (w/ memory)	FRONT POWER SEAT CONTROL SYSTEM - DIAGNOSTICS
21. Power Door Lock Control System	POWER DOOR LOCK CONTROL SYSTEM - DIAGNOSTICS
22. Wireless Door Lock Control System	WIRELESS DOOR LOCK CONTROL SYSTEM - DIAGNOSTICS
23. Key Reminder Warning System	KEY REMINDER WARNING SYSTEM - DIAGNOSTICS
24. Engine Immobilizer System	ENGINE IMMOBILIZER SYSTEM - DIAGNOSTICS
25. Theft Deterrent System	THEFT DETERRENT SYSTEM - DIAGNOSTICS
26. Multiplex Communication System	MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICS
27. CAN Communication System	CAN COMMUNICATION SYSTEM - DIAGNOSTICS
28. Cruise Control System	CRUISE CONTROL SYSTEM - DIAGNOSTICS