Toyota Highlander manuals

Toyota Highlander Service Manual: General information

A large number of ECU controlled systems are used in the HIGHLANDER. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot. However, most problem checking procedures only involve inspecting the ECU controlled system's circuits one by one. An adequate understanding of the system and a basic knowledge of electricity is enough to perform effective troubleshooting, accurate diagnoses and necessary repairs. Detailed information and troubleshooting procedures on major ECU controlled systems in this vehicle are outlined below:


  1. SFI System (2AZ-FE)
  2. SFI System (3MZ-FE)
  3. Tire Pressure Warning System
  4. ABS with EBD & BA & TRAC & VSC System
  5. Electronic Controlled Automatic Transaxle [ECT] (U241E/U140F)
  6. Electronic Controlled Automatic Transaxle [ECT] (U151E/U151F)
  7. Air Conditioning System
  8. Supplement Restraint System
  9. Lighting System
  10. Audio System
  11. Rear Seat Entertaiment System
  12. Navigation System
  13.  Combination Meter
  14. Power Window Control System
  15. Power Door Lock Control System
  16. Wireless Door Lock Control System
  17. Sliding Roof System
  18. Engine Immobiliser System
  19. Theft Deterrent System
  20. Multiplex Communication System
  21. CAN Communication System
  22. Cruise Control System


  1.  If communication is normal when the tester is connected to another vehicle, inspect the diagnosis data link line (Bus line) or ECU power circuit of the vehicle.
  2.  If communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. So perform the Self Test procedures outlined in the Tester Operator's Manual.
How to troubleshoot ecu controlled systems

How to proceed with troubleshooting
HINT: Carry out troubleshooting in accordance with the procedures below. Only a basic procedure is shown. Details in the Diagnostic Section show the most effective methods for each circuit. Conf ...

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Using the rear view monitor system
Screen description The rear view monitor system screen will be displayed if the shift lever is shifted to r while the engine switch is in “on” position. Vehicle width guide lines the line indicates a guide path when the vehicle is being backed straight up.The displayed width is wid ...

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