Toyota Tundra Service Manual: Fail-safe Chart

Toyota Tundra Service Manual / Steering / Steering Column / Power Tilt And Power Telescopic Steering Column System / 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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