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:

System

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

FOR USING OBD II SCAN TOOL OR HAND-HELD TESTER

• Before using the scan tool or tester, the scan tool's instruction book or tester's operator manual should be read thoroughly.
• If the scan tool or tester cannot communicate with the ECU controlled systems when you have connected the cable of the tester to the DLC3 with the ignition switch and tester turned ON, there is a problem on the vehicle side or tester side.

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.

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