How To Proceed With Troubleshooting: Pre-Check

DESCRIPTION
1. DIAGNOSIS SYSTEM
  When troubleshooting Multiplex OBD (M-OBD) vehicles, the only difference from the usual troubleshooting procedure is that you connect the LEXUS hand-held tester to vehicle, and read off various data output from the vehicle's tilt and telescopic ECU.
  
  The tilt and telescopic ECU records the applicable DTCs when the computer detects a malfunction in the computer itself or its circuit.
  
  To check the DTCs, connect a LL hand-held tester to DLC3 on the vehicle. The LEXUS hand-held tester enables you to erase the DTCs and activate the several actuators and check freeze frame data and various forms on steering data.
  
  Fig 1: Connecting Lexus Hand-Held Tester To DLC3 On Vehicle
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. DATA LINK CONNECTOR 3 (DLC3)
  The tilt and telescopic ECU uses ISO 14230 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 14230 format.
  
  Fig 2: Identifying Data Link Connector 3 (DLC3)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Data Link Connector Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  If your display shows "UNABLE TO CONNECT TO VEHICLE" when you have connected the cable of LEXUS hand-held tester to DLC3, turned the ignition switch ON and operated the LEXUS hand-held tester, there is a problem on the vehicle side or tester side.
- If communication is normal when the tester is connected to another vehicle, inspect DLC3 on 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, so consult the service department listed in the tester's operator's manual.
DIAGNOSIS INSPECTION
1. Check the DTC.
  1. Prepare the LEXUS hand-held tester
  2. Connect the LEXUS hand-held tester to DLC3 the lower of the instrument panel.
  3. Turn the ignition switch ON and turn the LEXUS hand-held tester switch ON.
  4. Use the LEXUS hand-held tester to check the DTCs and freeze frame data, note or print them (See the Operator Manual for operating instructions).
    
    Fig 4: Connecting Lexus Hand-Held Tester To DLC3 Lower Of Instrument Panel
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. See DIAGNOSTIC TROUBLE CODE CHART to confirm the details of the DTC.
2. Clear the DTC.
  The following actions will erase the DTC and freeze frame data.
  - When using the LEXUS hand-held tester :Operating the LEXUS hand-held tester to erase the DTCs (See the Operator Manual for operating instructions).
  - When not using the LEXUS hand-held tester:Disconnecting the battery terminals.