DTC C1751: Compressor Relay Coil Malfunction (TO 08/2009): Description

The signal from the suspension control ECU turns on the AIR SUS relay, and then the height control compressor motor starts.

DTC No.	DTC Detection Condition	Trouble Area
C1751	When either of the following is detected: With the AIR SUS relay not activated, an open signal of the AIR SUS relay is detected for 1 second or more. With the AIR SUS relay activated, a short signal of the AIR SUS relay is detected 8 times successively.	AIR SUS relay Wire harness or connector Suspension control ECU