April 5, 2026: LEMON Manuals is launched! Read the announcement.

Air Suspension System: Fail-Safe

FAIL-SAFE FUNCTION

When an air suspension system malfunction is detected under the normal control operation, the suspension control ECU will suspend the switch control of the height control operation.

Air suspension system

FAIL-SAFE TABLE

DTC Table	Malfunction Item	Fall-safe Operation	Fall-safe Deactivation Conditions
C1711 C1712 C1713 C1714	Height control sensor circuit	To interrupt the height control and damping control.	Returns to normal condition.
C1715 C1716 C1717	Acceleration sensor circuit	To interrupt the damping control.	Returns to normal condition.
C1731 C1732 C1733 C1734	Absorber control actuator circuit	To interrupt the damping control, after moving to the 9th step. (Except malfunction actuator)	Returns to normal condition.
C1741 C1742 C1743 C1744	Height control solenoid valve circuit	To interrupt the height control.	Returns to normal condition.
C1745	Exhaust solenoid valve circuit	To interrupt the height control.	Returns to normal condition.
C1751	Suspension control relay circuit	To interrupt the height control.	Return to normal condition.
C1752 C1761	Lock is powered continuously or powered excessively in height control compressor motor	To interrupt the height control.	Returns to normal condition.
C1762	Continuous electric current to exhaust solenoid valve	To interrupt the height control.	Returns to normal condition.
C1781	Suspension control ECU	To continue control.	Returns to normal condition.
C1782	Power source voltage	To interrupt the height control and damping control.	Returns to normal condition.
C1783	Vehicle speed sensor circuit	Control is canceled after setting the step of the front and rear absorber control actuator at 9.	Returns to normal condition.
C1784	Steering angle sensor	To interrupt the damping force of rolling control.	Returns to normal condition.
C1785	Steering control ECU	To interrupt the damping force of rolling control.	Returns to normal condition.
C1787 C1788	Yaw & acceleration sensor	To interrupt the damping force of rolling control.	Returns to normal condition.
U0100 U0101 U0124	CAN communication system	To continue control.	Returns to normal condition.
U0122 U0132	CAN communication system	Control is canceled after setting the step of the front and rear absorber control actuator at 9.	Returns to normal condition.
U0126 U0130	CAN communication system	To interrupt the damping force of rolling control.	Returns to normal condition.