Toyota Avalon Service & Repair Manual: Fail-safe Chart

FAIL-SAFE CHART

HINT:

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 Circuit Voltage Out of Range

The tilt and telescopic operation using the switch is suspended.

B261096

Tilt Position Sensor or Tilt Motor Circuit Component Internal Failure

The tilt operation is suspended.

B261196

Telescopic Position Sensor or Telescopic Motor Circuit 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

FAIL-SAFE FUNCTION

(a) 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.

(b) 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.

(c) 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.

(d) 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

HINT:

  • ○: 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 power switch is on (IG) while the signal from the main body ECU (multiplex network body ECU) is interrupted. The operation is prohibited if the power switch is off while the signal from the main body ECU (multiplex network body ECU) is interrupted.
    Dtc Check / Clear

    Freeze Frame Data

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