Problem Symptoms Table

This system uses the multiplex communication system, so check diagnosis system of the multiplex communication system before you proceed with troubleshooting.

The table below will be useful for you in troubleshooting these electrical systems. The most likely causes of the malfunction are shown in the order of their probability. Inspect each part in the order shown, and replace the part when it is found to be faulty.

• If the instruction "Proceed to next circuit inspection shown on the chart" is given in the flow chart for each circuit, proceed to the circuit with the next highest number in the table to continue the check.
• If the problem still occurs even though there are no abnormalities in any of the other circuits, then check and replace ECU.
  PROBLEM SYMPTOMS TABLE - POWER TILT AND TELESCOPIC STEERING COLUMN
  
  

  Symptom	Suspect Area
  Both tilt and telescopic: Manual, Auto away/return and Memory functions Do not operate Stop part way Do not stop	Multiplex communication system ECU power source circuit Key unlock warning switch BODY ECU Actuator power source circuit Tilt and telescopic ECU
  Tilt only: Manual, Auto away/return and Memory functions Do not operate Stop part way Do not stop	Multiplex communication system Tilt motor circuit Tilt and telescopic ECU
  Telescopic only: Manual, Auto away/return and Memory functions Do not operate Stop part way Do not stop	Multiplex communication system Telescopic motor circuit Tilt and telescopic ECU
  Both tilt and telescopic: Only Tilt and Telescopic Manual switch function does not operate	Multiplex communication system Tilt and telescopic manual switch circuit Tilt and telescopic ECU
  Tilt only: Only Tilt and Telescopic Manual switch function does not operate	Multiplex communication system Tilt and telescopic manual switch circuit Tilt and telescopic ECU
  Telescopic only: Only Tilt and Telescopic Manual switch function does not operate	Multiplex communication system Tilt and telescopic manual switch circuit Tilt and telescopic ECU
  Both away and return: Only Auto away/return function does not operate	Check status of auto away function using LEXUS handheld tester Multiplex communication system Ignition switch Key unlock warning switch Tilt and telescopic ECU
  Only away: Only Auto away/return function does not operate	Multiplex communication system Key unlock warning switch Ignition switch Tilt and telescopic ECU
  Only return: Only Auto away/return function does not operate	Multiplex communication system Key unlock warning switch Ignition switch Tilt and telescopic ECU
  Only Memory function does not operate	Multiplex communication system Driver DOOR ECU SEAT ECU Tilt and telescopic ECU