Toyota Tundra Service Manual: Fail-safe Chart

FAIL-SAFE CHART

HINT:

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

B2603

Tilt and Telescopic Manual Switch Circuit Malfunction

Tilt and telescopic operation by manual switch is suspended.

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

Vehicles Speed Malfunction

Vehicles Speed Malfunction

U0142

Lost Communication with Main Body ECU

The tilt and telescopic operation is limited depending on which ECU has lost communication. For details, refer to Fail-safe Function.

U0208

Lost Communication with "Seat Control Module A"

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

(b) 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.

(c) 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.

(d) If the communication of an ECU that is related to the power tilt and power telescopic steering column system is interrupted, the system operates as shown below.

Tilt and Telescopic Operation

Main Body ECU Communication Interruption

Front Power Seat Switch LH Communication Interruption

All ECUs*1 Communication Interruption

Manual

○*2

X*2

Auto away/return

X

X

Position memory (Memorization)

X

X

X

Position memory (Recall)

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 ignition switch is on while the signal from the main body ECU (multiplex network body ECU) is interrupted. The operation is prohibited if the ignition 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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