POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM FAIL-SAFE CHART

Tech Tips

If the power voltage to the tilt and telescopic ECU returns to normal within 10 seconds during tilt or telescopic operation, the operation will be resumed. If it returns to normal after 10 seconds have elapsed, the operation restarts when a tilt or telescopic operation signal is again input to the tilt and telescopic ECU.

Fail-safe operation
DTC Code Detection Item Fail-safe
B2602 Key Unlock Warning Switch Circuit Malfunction

Auto away function stops.

Auto return function:


  • Continues (when the power switch is ON (IG)).

  • Stops (when the power switch is OFF).
B2603 Tilt and Telescopic Manual Switch Circuit Malfunction Tilt and telescopic operation by manual switch is suspended.
B2606 Key Code Confirm Signal Malfunction Auto away or auto return function stops.
B2610 Tilt Position Sensor or Tilt Motor Circuit Malfunction Tilt operation is suspended.
B2611 Telescopic Position Sensor or Telescopic Motor Circuit Malfunction Telescopic operation is suspended.
B2620 ECU Power Source Circuit Malfunction Tilt and telescopic operation is suspended.
B2624 Speed Signal Malfunction Auto away and/or auto return function stops.

  1. FAIL-SAFE FUNCTION


    1. If a malfunction in the tilt position sensor signal or telescopic position sensor signal occurs while operating the power tilt or power telescopic function, the tilt and telescopic ECU stops the operation of the power tilt and power telescopic steering column system.

    2. If the power voltage to the ECU drops below approximately 8 V while operating the power tilt or power telescopic function, the ECU stops the operation of the power tilt and power telescopic steering column system.

    3. If the tilt and telescopic ECU detects that the motor has locked during the operation of the power tilt or power telescopic function, the ECU stops the operation of the power tilt and power telescopic steering column system.

    4. If the communication of an ECU that is related to the power tilt and power telescopic steering column system is interrupted, the tilt and telescopic ECU effects the controls listed below.

    Tilt and Telescopic Operation Main Body ECU Communication Interruption Front Power Seat Switch LH*1 or RH*2 (Position Control ECU) Communication Interruption Windshield Wiper Switch Assembly (Combination Switch ECU) Communication Interruption All ECUs (*3) Communication Interruption
    Manual ○ (*4) ○ X X (*4)
    Auto away/return X ○ ○ X
    Position memory (Memorization) X X ○ X
    Position memory (Reproduction) ○ (*4) X ○ X

    Tech Tips


    • ○: Operates

      X: Does not operate

    • *1: for LHD

      *2: for RHD

    • *3: All ECUs that are related to the power tilt and power telescopic steering column system.

    • *4: The operation is permitted if the power switch signal is ON while the signal from the main body ECU is interrupted. The operation is prohibited if the power switch signal is OFF while the signal from the main body ECU is interrupted.