DTC U1240: Switch Conn: Description

WARNING: This page is about a different car, the 2010 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

U1240 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simultaneously, without fail, with the malfunction of control units connected to AV control unit with communication line. Determine the possible malfunction cause from the table below.

Self-diagnosis results display item

DTC DETECTION CONDITION CHART

DTC	Display contents of CONSULT-III	DTC Detection Condition	Possible causes
U1240	SWITCH CONN [U1240]	A/C and AV switch assembly power supply and ground circuit malfunction is detected. A malfunction is detected in communication circuit between AV control unit and A/C and AV switch assembly. A malfunction is detected in communication signal between AV control unit and A/C and AV switch assembly.	A/C and AV switch assembly power supply and ground circuits. Communication circuit between AV control unit and A/C and AV switch assembly.