Check At Automatic Compressor Controller Terminal

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Automatic Compressor Controller Terminal

Courtesy of DAIMLERCHRYSLER CORPORATION

AUTOMATIC COMPRESSOR CONTROLLER TERMINAL CHECK

TERMINAL NO.	INSPECTION ITEM	INSPECTION REQUIREMENTS	NORMAL CONDITION
1	Power supply	Ignition switch: "LOCK" (OFF)	0 V
1	Power supply	Ignition switch: "ON"	Battery positive voltage
2	Input from thermistor sensor to controller	Ignition switch and A/C switch: OFF	0 V
2	Input from thermistor sensor to controller	Ignition switch and A/C switch: ON	2 - 5 V
3	Thermistor sensor power supply	Ignition switch and A/C switch: OFF	0 V
3	Thermistor sensor power supply	Ignition switch and A/C switch: ON	5 V
4	Output from controller to engine control module < M/T >/powertrain control module < A/T > (A/C signal)	Dual pressure switch: ON A/C switch: ON Blower switch: ON Air thermistor sensor detection temperature: 4°C (39.2°F) or more	Battery positive voltage
4		The other condition	0 V
5	Output from controller to engine control module < M/T >/powertrain control module < A/T > (A/C2 signal)	A/C switch: ON Blower switch: ON Air thermistor sensor detection temperature: 6°C (42.8°F) or more	Battery positive voltage
5		The other condition	0 V
6	-	-	-
7	Input from A/C switch (outside/inside air selection damper control switch) to controller	Outside air switch: ON Inside air switch: OFF	Battery positive voltage
7		Outside air switch: OFF Inside air switch: ON	0 V
8	Input from defroster switch (FOOT) to controller	Defroster switch (FOOT): ON	0 V
8	Input from defroster switch (FOOT) to controller	Defroster switch (FOOT): OFF	Battery positive voltage
9	Input from defroster switch (DEF) to controller	Defroster switch (DEF): ON	0 V
9	Input from defroster switch (DEF) to controller	Defroster switch (DEF): OFF	Battery positive voltage
10	Input from A/C switch to controller	A/C switch: OFF	Battery positive voltage
10	Input from A/C switch to controller	A/C switch: ON	0 V
11	Ground	Always	0 V
12	-	-	-
13, 14	Input from A/C switch (IND) to controller	A/C switch: OFF	0 V
13, 14	Input from A/C switch (IND) to controller	A/C switch: ON	Battery positive voltage
15	-	-	-
16	Output from controller to outside/inside air selection damper control motor	Outside air switch: ON Inside air switch: OFF	Battery positive voltage
16		Outside air switch: OFF Inside air switch: ON	0 V
17	Output from controller to outside/inside air selection damper control motor	Outside air switch: ON Inside air switch: OFF	0 V
17		Outside air switch: OFF Inside air switch: ON	Battery positive voltage
18	Input from taillight relay to controller	Taillight relay: OFF	0 V
18	Input from taillight relay to controller	Taillight relay: ON	Battery positive voltage
19	Input from blower switch (LO) to controller	Blower switch (LO): OFF	0 V
19	Input from blower switch (LO) to controller	Blower switch (LO): ON	Battery positive voltage
20	-	-	-
21	Input from A/C compressor clutch relay to controller	A/C compressor clutch relay: OFF	0 V
21	Input from A/C compressor clutch relay to controller	A/C compressor clutch relay: ON	Battery positive voltage
22	Input from distributor assembly to controller	Ignition switch: "LOCK" (OFF)	0 V
		Ignition switch: "ON" (engine stopped)	Battery positive voltage
		Ignition switch: "ON" (engine stopped)	0 V - Battery positive voltage
23	Revolution pick-up sensor power supply	Ignition switch and A/C switch: OFF	0 V
23	Revolution pick-up sensor power supply	Ignition switch and A/C switch: ON	5 V
24	Input from revolution pick-up sensor relay to controller	A/C compressor clutch relay: OFF	0 V
24	Input from revolution pick-up sensor relay to controller	A/C compressor clutch relay: ON	2 - 5 V