SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): FAIL-SAFE CHART (2008 Sequoia)

1. FAIL-SAFE FUNCTION

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

DTC No.	Malfunction	Fail-Safe	Fail-Safe Deactivation Condition
C1713 C1714	Height control sensor circuit	If there is an error on only 1 side, the system continues vehicle height control. If errors occur on both sides, the system interrupts vehicle height control. Interrupts the damping force control	Return to normal condition.
C1715 C1716 C1717	Acceleration sensor circuit	Continues damping force control (9th step is lower limit	Return to normal condition.
C1731 C1732 C1733 C1734	Absorber control actuator circuit	Interrupts the damping force control, after moving to the 16th step. (Except malfunction actuator)	Return to normal condition.
C1745	Exhaust solenoid valve circuit	Auto mode: The system sets the target vehicle height to normal, performs vehicle height ascent control, and interrupts control. Manual mode: The system accepts a switch operation for ascent, provided that the vehicle height is below normal. Continues damping force control.	Return to normal condition.
C1746	Gate solenoid valve circuit	Interrupts vehicle height control. Continues damping force control.	Return to normal condition.
C1747	Leveling solenoid valve circuit	Interrupts vehicle height control. Continues damping force control.	Return to normal condition.
C1751	AIR SUS relay circuit	Auto mode: The system sets the target vehicle height to normal, performs vehicle height descent control, and interrupts control. Manual mode: The system accepts a switch operation for descent, provided that the vehicle height is above normal. Continues damping force control.	Return to normal condition.
C1752	Lock in height control compressor motor	Auto mode: The system sets the target vehicle height to normal, performs vehicle height descent control, and interrupts control. Manual mode: The system accepts a switch operation for descent, provided that the vehicle height is above normal. Continues damping force control.	After interrupting for 70 minutes, restart the control.
C1761	Powered continuously or powered excessively in height control compressor motor	Auto mode: Powered continuously the first time: When the target vehicle speed is set to normal or HI, and the vehicle height is higher than the target, the system performs vehicle height descent control and interrupts control. Powered continuously the second time: The system sets the target vehicle height to normal, effects vehicle height descent control, and interrupts control. Manual mode: When the compressor motor is powered continuously both the first and second times, the system accepts a switch operation for descent, provided that the vehicle height is above normal. Continues damping force control.	After interrupting for 70 minutes, restart the control.
C1762	Powered continuously or powered excessively in exhaust solenoid valve	Auto mode: The system sets the target vehicle height to normal, performs vehicle height ascent control, and interrupts control. Manual mode: The system accepts a switch operation for ascent, provided that the vehicle height is below normal. Continues damping force control.	Return to normal condition.
C1781	Suspension control ECU	Interrupts vehicle height control and damping force control.	Return to normal condition.
C1782	Power voltage dropped	The system interrupts vehicle height control only when there is an error in the +B power source. Interrupts the damping force control	Return to normal condition.
C1783	Vehicle speed sensor circuit	Continues vehicle height control. Interrupts the damping force control, after moving to the 9th step.	Return to normal condition.
C1784	Steering angle sensor	Continues vehicle height control. Interrupts the damping force of rolling control.	Return to normal condition.
U0100	CAN communication system	Continues vehicle height control and damping force control.	Return to normal condition.
U0122	CAN communication system	Continues vehicle height control. Interrupts the damping force control, after moving to the 9th step.	Return to normal condition.
U0126	CAN communication system	Continues vehicle height control. Interrupts the damping force of rolling control.	Return to normal condition.