AIR CONDITIONING SYSTEM TERMINALS OF ECU
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AIR CONDITIONING AMPLIFIER ASSEMBLY
Tech Tips
Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.
Terminal No.
(Symbol)
Wiring Color Terminal Description Condition Specified Condition L17-1 (IG+) - L17-14 (GND) P - W-B Power source (IG) Power switch on (IG) 11 to 14 V Power switch off Below 1 V L17-5 (TAM) - L17-13 (SG-2) R - G Ambient temperature sensor signal Power switch on (IG)
Ambient temperature: 25°C (77°F)
1.35 to 1.75 V Power switch on (IG)
Ambient temperature: 40°C (104°F)
0.9 to 1.2 V L17-9 (PRE) - L17-13 (SG-2) L - G Air conditioning pressure sensor signal A/C system operating
Refrigerant pressure: Abnormal pressure (more than 3.025 MPa (30.8 kgf/cm2, 439 psi))
4.69 V or higher A/C system operating
Refrigerant pressure: Abnormal pressure (less than 0.167 MPa (1.7 kgf/cm2, 24 psi))
Below 0.70 V A/C system operating
Refrigerant pressure: Normal pressure (less than 3.025 MPa (30.8 kgf/cm2, 439 psi) and more than 0.167 MPa (1.7 kgf/cm2, 24 psi))
0.70 to 4.69 V L17-10 (S5-3) - L17-13 (SG-2) LG - G Power supply for air conditioning pressure sensor Power switch on (IG) 4.75 to 5.25 V Power switch off Below 1 V L17-11 (CANH) - L17-12 (CANL) B - W CAN communication system CAN communication circuit Pulse generation L17-13 (SG-2) - Body ground G - Body ground Ground for air conditioning pressure sensor, ambient temperature sensor Always Below 1 V L17-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V L17-15 (ECOS) - L17-14 (GND) V - W-B Combination switch (ECO switch) signal Power switch on (IG)
Combination switch (ECO switch) off
11 to 14 V Power switch on (IG)
Combination switch (ECO switch) on
Below 1 V L17-16 (PTC3) - L17-14 (GND)*1 BR - W-B PTC heater operation signal Power switch on (READY)
Temperature setting: MAX. HOT
Ambient temperature: 10°C (50°F) or lower
Engine coolant temperature: 65°C (149°F) or lower
Light control switch off
Blower switch on
11 to 14 V L17-18 (PTC1) - L17-14 (GND)*1 W - W-B PTC heater operation signal Power switch on (READY)
Temperature setting: MAX. HOT
Ambient temperature: 10°C (50°F) or lower
Engine coolant temperature: 75°C (167°F) or lower
Light control switch off
Blower switch on
11 to 14 V L17-20 (RDFG) - L17-14 (GND) SB - W-B Rear defogger switch signal Power switch on (IG)
Rear defogger switch off
11 to 14 V Power switch on (IG)
Rear defogger switch on
Below 1 V L17-21 (B) - L17-14 (GND) Y - W-B Power source (Back-up) Power switch off 11 to 14 V L17-23 (BLW) - L17-14 (GND) L - W-B Blower motor speed control signal Power switch on (IG)
Blower switch: LO
Pulse generation
(See waveform 1)
L17-27 (IDH) - L17-14 (GND)*1 P - W-B Inverter with converter assembly current over signal Power switch on (IG)
Quick heater assembly operation permitted
Less than 1 V Power switch on (IG)
Quick heater assembly operation not permitted
4.75 to 5.25 V L17-29 (TR) - L17-34 (SG-1) Y - L Room temperature sensor signal Power switch on (IG)
Cabin temperature: 25°C (77°F)
1.8 to 2.2 V Power switch on (IG)
Cabin temperature: 40°C (104°F)
1.2 to 1.6 V L17-33 (TS) - L17-14 (GND) GR - W-B Solar sensor signal Power switch on (IG)
Solar sensor subjected to electric light
0.8 to 4.3 V Power switch on (IG)
Solar sensor covered with a cloth
Below 0.8 V L17-34 (SG-1) - Body ground L - Body ground Ground for room temperature sensor Always Below 1 V L17-37 (LIN1) - L17-14 (GND) V - W-B LIN communication signal Power switch on (IG) Pulse generation L17-38 (PTC2) - L17-14 (GND)*1 B - W-B PTC heater operation signal Power switch on (READY)
Temperature setting: MAX. HOT
Ambient temperature: 10°C (50°F) or lower
Engine coolant temperature: 65°C (149°F) to 70°C (158°F)
Light control switch off
Blower switch on
11 to 14 V z11-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V z11-3 (BUS) - z11-2 (BUS G) - BUS IC control signal Power switch on (IG) Pulse generation z11-4 (B BUS) - z11-2 (BUS G) - Power supply for BUS IC Power switch off 11 to 14 V z11-5 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 V z11-6 (TEA) - z11-5 (SGA) - Evaporator temperature sensor signal Power switch on (IG)
Evaporator temperature: 0°C (32°F)
2.0 to 2.4 V Power switch on (IG)
Evaporator temperature: 15°C (59°F)
1.4 to 1.8 V
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*1: w/ Quick Heater Assembly
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Waveform 1:
Item Content Terminal No. L17-23 (BLW) - L17-14 (GND) Tool Setting 1 V/DIV., 500 μs/DIV. Vehicle Condition Power switch on (IG)
Blower switch: LO
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CENTER CLUSTER MODULE CIRCUIT (AIR CONDITIONING CONTROL ASSEMBLY)
Tech Tips
Check from the rear of the connector while it is connected to the center cluster module circuit (air conditioning control assembly).
Terminal No.
(Symbol)
Wiring Color Terminal Description Condition Specified Condition L20-1 (GND) - Body ground W-B - Body ground Ground for center cluster module circuit (air conditioning assembly) Always Below 1 V L20-3 (TX+) - Body ground V - Body ground LIN communication signal Power switch on (IG) Pulse generation L20-7 (ILL+) - L20-12 (ILL-) P - W-B Light control switch signal Light control switch tail or head position 11 to 14 V Light control switch off Below 1 V L20-10 (SWO) - Body ground L - Body ground Steering pad switch assembly signal No switch pushed
→ R/F switch pushed
→ TEMP+ switch pushed
→ TEMP- switch pushed
4.44 to 5.43 V
→ 1.19 to 1.49 V
→ 2.09 to 2.54 V
→ 3.2 to 3.88 V
L20-16 (IG+) - Body ground Y - Body ground Power source (IG) Power switch on (IG) 11 to 14 V Power switch off Below 1 V -
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