Diagnosis System

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

DESCRIPTION
1. The seat ECU controls the function of the front power seat control system on the vehicle. Data of t' power front seat control system can be read in the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the hand-held tester to check for malfunctions and perform repairs.
CHECK DLC3
HINT:

The vehicle's ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Fig 1: Identifying DLC3 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: DLC3 Connector Terminals Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Connect the cable of the hand-held tester (with CAN VIM) to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the tester side.
- If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
- If the communication is still impossible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
  
  Fig 3: Connecting Hand-Held Tester (With CAN VIM) To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK BATTERY VOLTAGE
Standard: 11 to 14 V

If voltage is below 11 V, replace the battery before proceeding.