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.

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.

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.