Description of On-Board Diagnostics

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 power tilt and telescopic steering ECU.
The power tilt and telescopic steering ECU records the applicable DTCs when the computer detects a malfunction in the computer itself or its circuit.
To check the DTCs, connect a LEXUS 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.