Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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 Code | Detection Item | Fail-safe Operation |
|---|---|---|
| B2603 | Tilt and Telescopic Switch Circuit Malfunction | The tilt and telescopic operation using the switch is suspended. |
| B2610 | Tilt Position Sensor or Tilt Motor Circuit Malfunction | The tilt operation is suspended. |
| B2611 | Telescopic Position Sensor or Telescopic Motor Circuit Malfunction | The telescopic operation is suspended. |
| B2620 | ECU Power Source Circuit Malfunction | The tilt and telescopic operation is suspended. |
| B2624 | Vehicles Speed Malfunction | The auto away/return function stops. |
| 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" |
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 Communication Interruption | Position Control ECU and Switch Assembly 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 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.
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Turn the engine switch off. (b) Connect the Techstream to the DLC3. (c) Turn the engine switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Body ...
Freeze Frame Data
FREEZE FRAME DATA FREEZE FRAME DATA NOTICE:
Freeze frame data values will vary depending on the measurement conditions, surroundings, or vehicle conditions. For this reason, there may be a problem ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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