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

Tech Tips

If the power source voltage to the multiplex 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 sent to the multiplex tilt and telescopic ECU again.

Fail-safe Operation
DTC Code Detection Item Fail-safe Operation
B26031C Tilt and Telescopic Manual Switch Circuit Malfunction Circuit Voltage Out of Range The tilt and telescopic operation using the switch is suspended.
B261096 Tilt Position Sensor or Tilt Motor Circuit Malfunction Component Internal Failure The tilt operation is suspended.
B261196 Telescopic Position Sensor or Telescopic Motor Circuit Malfunction Component Internal Failure The telescopic operation is suspended.
B2620A2 ECU Power Source Circuit System Voltage Low The tilt and telescopic operation is suspended.
U014287 Lost Communication with Body Control Module "B" Missing Message The tilt and telescopic operation is limited depending on which ECU has lost communication. For details, refer to Fail-safe Function.
U015587 Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message
U020887 Lost Communication with "Seat Control Module A" Missing Message

  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 multiplex tilt and telescopic ECU stops the operation of the power tilt and power telescopic steering column system.

    2. If the power source 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 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 control of functions of the multiplex tilt and telescopic ECU are limited as shown in the table below.

    Tilt and Telescopic Operation Main Body ECU (Multiplex Network Body ECU) Communication Interruption Combination Meter Assembly Communication Interruption Position Control ECU Assembly (driver seat) Communication Interruption All ECUs*1 Communication Interruption
    Manual ○*2 ○ ○ ○*2
    Auto away/return X X ○ X
    Position memory (Memorization) X ○ ○ X
    Position memory (Recall) X X X X

    Tech Tips


    • ○: Operates

      X: Does not operate

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

    • *2: The operation is permitted if the engine switch is on (IG) while the signal from the main body ECU (multiplex network body ECU) is interrupted. The operation is prohibited if the engine switch is off while the signal from the main body ECU (multiplex network body ECU) is interrupted.