Highlander 4WD V6-30L (1MZ-FE) (2003) - Brake Lamp Component Diagrams
HINT: Carry out a troubleshooting in accordance with the procedures. Here, only the basic procedures are shown. Details are provided in the
Diagnostics section, showing the most effective methods for each circuit. Confirm the troubleshooting procedures first for the relevant circuit before
beginning the troubleshooting of that circuit.
General Information
GENERAL INFORMATION
HINT: A large number of ECU controlled systems are used in HIGHLANDER. In general, the ECU controlled system is considered to be a very
intricate system requiring high level of technical knowledge and expert skill to troubleshoot. The fact is, however, that if you proceed to inspect the
circuit inspections one by one, troubleshooting of these systems is not complex. If you have adequate understanding of the system and basic knowledge
of electricity, accurate diagnosis and necessary repair can be performed to locate and fix the problem.
FOR USING SCAN TOOL OR HAND-HELD TESTER
HINT:
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Before using the scan tool or tester, the scan tool's instruction book or tester's operator manual should be read thoroughly.
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If the scan tool or tester cannot communicate with the ECU controlled systems when you have connected the cable of the scan tool or tester to the
DLC3 with the ignition switch and tester turn ON, there is a problem on the vehicle side or tester side.
1. If the 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 the 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.
Electronic Circuit Inspection Procedure
ELECTRONIC CIRCUIT INSPECTION PROCEDURE
1. BASIC INSPECTION
a. RESISTANCE MEASURING CONDITION OF ELECTRONIC PARTS
1. Unless stated, all resistance is measured at an ambient temperature of 20 °C (68 °F). Because the resistance may be outside the
specifications if measured at high temperatures immediately after the vehicle has been running, measurements should be made when the
engine has cooled down.