Climate Control System Description (With Climate Control)

Climate Control System Description

The air conditioning system removes heat from the passenger compartment by circulating refrigerant through the system as shown below.

EVAPORATOR EXPANSION VALVE
(Meters the required amount of
refrigerant into the evaporator)RECEIVER/DRYER
(Traps debris, and
removes moisture)A/C COMPRESSOR
(Suction and compression)A/C CONDENSER
(Radiation of heat)A/C PRESSURE SWITCH
When the refrigerant is below
196 kPa (2.0 kgf/cm², 28 psi)
or above 3,140 kPa (32 kgf/cm² ,
455 psi), the A/C pressure
switch opens the circuit to
the A/C switch and stops the
air conditioning to protect the
compressor.BLOWER FANEVAPORATOR
(Absorption of heat)EVAPORATOR TEMPERATURE
SENSORA/C COMPRESSOR RELIEF VALVE
(Relieves pressure at the compressor
when the pressure is too high)HIGH PRESSURE VAPORHIGH PRESSURE LIQUIDLOW PRESSURE LIQUIDLOW PRESSURE VAPOR

This vehicle uses HFC-134a (R-134a) refrigerant which does not contain chlorofluorocarbons. Pay attention to the following service items:

Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (KEIHIN SP-10) designed for the R-134a compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in compressor failure.
All A/C system parts (compressor, discharge line, suction line, evaporator, condenser, receiver/dryer, expansion valve, O-rings for joints) have to be designed for refrigerant R-134a. Do not exchange with R-12 parts.
Use a halogen gas leak detector designed for refrigerant R-134a.
R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service R-134a air conditioning system.
Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any A/C fitting.

Climate Control Unit Inputs and Outputs

CLIMATE CONTROL UNIT CONNECTORSCONNECTOR A(22P)CONNECTOR B(16P)Wire side of female terminals

**CONECTOR A (¡ on Circuit Diagram)**
Cavity	Wire color	Signal
1	PNK/BLK	DRIVER'S AIR MIX POTENTIAL	INPUT
2	YEL	PASSENGER'S AIR MIX POTENTIAL	INPUT
3	———	———	———
4	———	———	———
5	BLU	A/C PRESSURE SWITCH	OUTPUT
6	YEL/BLU	MODE DEF	OUTPUT
7	YEL/RED	MODE VENT	OUTPUT
8	GRN	DRIVER'S AIR MIX COOL	OUTPUT
9	PNK/BLU	DRIVER'S AIR MIX HOT	OUTPUT
10	YEL/BLK	PASSENGER'S AIR MIX COOL	OUTPUT
11	LT BLU	IN-CAR TEMPERATURE SENSOR	INPUT
12	PNK	OUTSIDE AIR TENPERATURE SENSOR	INPUT
13	ORN	SUNLIGHT SENSOR	INPUT
14	BRN	EVAPORATOR TEMPERATURE SENSOR	INPUT
15	RED [RED/BLK]	SENSOR COMMON GROUND	OUTPUT
16	YEL/GRN	MODE 4	INPUT
17	WHT/BLU	MODE 3	INPUT
18	RED/BLU	MODE 2	INPUT
19	RED/YEL	MODE 1	INPUT
20	GRY	DRIVER'S AIR MIX POTENTIAL +5 V	OUTPUT
21	———	———	———
22	LT GRN	PASSENGER'S AIR MIX HOT	OUTPUT

[ ]: RHD

**CONECTOR B (¨ on Circuit Diagram)**
Cavity	Wire color	Signal
1	BLU/YEL	POWER TRANSISTOR	OUTPUT
2	BLU/RED	BLOWER FEEDBACK	INPUT
3	———	———	———
4	BLK/YEL	IG2 (Power)	INPUT
5	———	———	———
6	BLK	GROUND	INPUT
7	———	———	———
8	———	———	———
9	———	———	———
10	GRN/WHT	FRESH	OUTPUT
11	LT GRN/RED	RECIRCULATE	OUTPUT
12	———	———	———
13	———	———	———
14	LT BLU	MULTIPLEX INTEGRATED CONTROL UNIT	INPUT
15	———	———	———
16	———	———	———