Diagnosis System
WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
- LIST OF OPERATION METHODS
By operating the A/C control switches as shown in the diagram below, it is possible to enter the diagnostic check mode.
- CHECK DLC3
The ECM uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTOR TERMINALS REFERENCE CHARTSymbols (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During transmission Pulse generation BAT (16) - Body ground Battery positive Always 11 to 14 V CG (4) - Body ground Chassis ground Always Below 1 Ω SG (5) - Body ground Signal ground Always Below 1 Ω CANH (6) - CANL (14) CAN bus line Ignition switch OFF(1) 54 to 69 Ω CANH (6) - Battery positive (+) HIGH-level CAN bus line Ignition switch OFF(1) 200 Ω or higher CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF(1) 200 Ω or higher CANL (14) - Battery positive (+) LOW-level CAN bus line Ignition switch OFF(1) 6 kΩ or higher CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF(1) 6 kΩ or higher NOTE:(1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
HINT:
Connect the cable of the intelligent tester (with CAN VIM) to the DLC3, turn the ignition switch ON and attempt to use the tester. If the screen displays the message UNABLE TO CONNECT TO VEHICLE, there is a problem either with the vehicle or with the tester.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
- If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.