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 power switch is on (IG) while the signal from the main body ECU (multiplex network body ECU) is interrupted. The operation is prohibited if the power switch is off while the signal from the main body ECU (multiplex network body ECU) is interrupted.
READ NEXT:
Data List / Active Test
DATA LIST / ACTIVE TEST READ DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any part
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
Diagnostic Trouble Code Chart
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
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT FLOW SHUTTING VALVE (WATER BY-PASS HOSE ASSEMBLY) (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 22 to 28 Ω If the result is not as s
PKSB (Parking Support Brake)
The Parking Support Brake system
consists of the following functions
that operate when driving at a low
speed or backing up, such as when
parking. When the system determines
that the possibility of a collision
with a detected object or
pedestrian is high, a warning operates
to urge the drive
