Lexus ES: 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 No. | 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 engine switch is on (IG) while the signal from the main body ECU (multiplex network body ECU) is interrupted. The operation is prohibited if the engine switch is off while the signal from the main body ECU (multiplex network body ECU) is interrupted.
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DIAGNOSTIC TROUBLE CODE CHART Power Tilt and Power Telescopic Steering Column System DTC No. Detection Item DTC Detection Condition Link B26031C Tilt and Telescopic Manual Switch Circui
Tilt and Telescopic Manual Switch Circuit Circuit Voltage Out of Range (B26031C)
DESCRIPTION Different voltage values are sent to the multiplex tilt and telescopic ECU by operating the tilt and telescopic switch. The multiplex tilt and telescopic ECU then judges which motor and in
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