Fail-Safe Chart

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

HINT

If the power voltage to the 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 ECU

Fail-safe Operation

FAIL-SAFE CHART

DTC No.	Detection Item	Fail-safe
B2602	Key Unlock Warning Switch Circuit Malfunction	Auto away function stops Auto return function Continues (when the engine switch is on (IG)) Stops (when the engine switch is off)
B2606	Key Code Confirm Signal Malfunction	Auto away or auto return function stops
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 operations is suspended
B2624	Speed Signal Malfunction	Auto away and/or auto return function stops

HINT

If the communication of an ECU related to this system is interrupted, the ECU effects the controls listed below (Example: When the windshield wiper switch assembly (combination switch ECU) is defective, manual operation is not available but the auto away/return and position memory functions can operate)

MAIN BODY ECU, POWER SEAT SWITCH AND MULTIPLEX COMMUNICATION INTERRUPTION REFERENCE

Tilt and Telescopic Operation

Main Body ECU RH (Cowl Side Junction Block RH)

Front Power Seat Switch LH (Position Control ECU)

Windshield Wiper Switch Assembly (Combination Switch ECU)

Multiplex Communication Interruption

Manual

◦ (Engine switch on (IG))

◦

Auto away/return

◦

Position memory (Memorization)⁽¹⁾

◦

Position memory (Reproduction)⁽¹⁾

◦ (Engine switch on (IG))

◦

◦ Operates
X Does not operate

⁽¹⁾	Operates with seat position memory