DTC C1745-45: Exhaust Solenoid [08/2015 - 08/2019]: Description

The suspension control ECU operates the exhaust solenoid valve (height control compressor), releases the air from the height control cylinder assembly (pneumatic cylinder) and lowers the vehicle height.

When the vehicle height is lowered, the suspension control ECU opens the height control valve and then operates the exhaust solenoid valve to release compressed air to the outside.

The exhaust solenoid valve is on the compressor unit and has only one valve.

DTC Code	DTC Detection Condition	Trouble Area
C1745/45	Either condition is met: With the exhaust solenoid valve not activated, an open signal of the exhaust solenoid valve is detected for 1 second or more. With the exhaust solenoid valve activated, a short signal of the exhaust solenoid valve is detected 8 times successively.	Harness or connector Exhaust solenoid valve (Height control compressor) Suspension control ECU

HINT:

Once the suspension control ECU stores DTC C1745/45 in memory, vehicle height control is suspended until a normal signal is input to the suspension control ECU from the exhaust solenoid valve. However, control is resumed if the engine switch is turned off and then on (IG) again.
Malfunction in the exhaust solenoid valve:
Height control indicator N comes on or blinks and HI and LO do not come on by operating the height control switch "up" or "down".