Terminal
|
Signal name
|
Connected to
|
Measurement condition
|
Voltage (V)
|
Inspection item(s)
|
1A
|
Blower fan speed control
|
Power transistor
|
Fan stopped
|
1.0 or less
|
• A/C amplifier: terminal voltage (1A)
|
Fan: manual LO
|
2.1
|
Fan: manual HI
|
2.9
|
1B
|
Blower motor feedback
|
• Blower motor
• Power transistor
|
Fan stopped
|
B+
|
1. Wiring harness: continuity, short circuit (A/C amplifier-power transistor: 1A-D, 1B-C) (Blower motor-blower relay: A-D) (Blower relay-fuse: C-HEATER 40 A, A-A/C 7.5 A)
2. Wiring harness: continuity (Power transistor-body ground: A-GND) (Blower relay-A/C amplifier: E-1L)
3. Power transistor
4. Blower motor
5. Blower relay
6. A/C 7.5 A fuse
7. HEATER 40 A fuse
8. Power transistor replacement
|
Fan: manual LO
|
9.0
|
Fan: manual HI
|
0.7
|
1C
|
Version signal (U.K. specs.)
|
Body ground
|
Under any condition
|
1.0 or less
|
• Wiring harness: continuity (A/C amplifier-GND: 1C-GND)
|
1D
|
Version signal (European (L.H.D.) specs.)
|
Body ground
|
Under any condition
|
1.0 or less
|
• Wiring harness: continuity (A/C amplifier-GND: 1D-GND)
|
1E
|
-
|
-
|
-
|
-
|
-
|
1F
|
-
|
-
|
-
|
-
|
-
|
1G
|
-
|
-
|
-
|
-
|
-
|
1H
|
-
|
-
|
-
|
-
|
-
|
1I
|
Motor operation
|
Air intake actuator
|
Switched to RECIRCULATE
|
1.0 or less
|
• Wiring harness: continuity, short circuit (A/C amplifier-air intake actuator: 1I-A, 1J-C)
• Air intake actuator
|
Switched to FRESH
|
12
|
1J
|
Motor operation
|
Air intake actuator
|
Switched to RECIRCULATE
|
12
|
• Wiring harness: continuity, short circuit (A/C amplifier-air intake actuator: 1J-C, 1I-A)
• Air intake actuator
|
Switched to FRESH
|
1.0 or less
|
1K
|
Rear window defroster operation
|
Rear window defroster relay
|
Rear window defroster switch OFF
|
B+
|
• Wiring harness: continuity, short circuit (A/C amplifier-rear window defroster relay: 1K-E)
• Rear window defroster relay
|
Rear window defroster switch ON
|
1.0 or less
|
• A/C amplifier: terminal voltage (2C, 2N)
|
1L
|
Blower motor operation
|
Blower relay
|
Fan switch OFF
|
B+
|
• Wiring harness: continuity, short circuit (A/C amplifier-blower relay: 1L-E)
• Blower relay
|
Fan switch ON
|
1.0 or less
|
• A/C amplifier: terminal voltage (2C, 2N)
|
1M
|
A/C
|
Refrigerant pressure switch
|
Fan stopped
|
B+
|
• Wiring harness: continuity, short circuit (A/C amplifier-refrigerant pressure switch: 1M-B) (Refrigerant pressure switch-PCM: C-4W)
• Refrigerant pressure switch
• PCM: terminal voltage (4W)
|
Fan switch: ON and A/C switch: ON
|
1.0 or less
|
• A/C amplifier: terminal voltage (2C, 2N)
|
1N
|
-
|
-
|
-
|
-
|
-
|
1O
|
-
|
-
|
-
|
-
|
-
|
1P
|
Signal
|
-
|
-
|
-
|
-
|
1Q
|
-
|
-
|
-
|
-
|
-
|
1R
|
Signal
|
-
|
-
|
-
|
-
|
1S
|
-
|
-
|
-
|
-
|
-
|
1T
|
-
|
-
|
-
|
-
|
-
|
1U
|
Motor operation
|
Air mix actuator
|
Moving towards COLD
|
1.0 or less
|
• Wiring harness: continuity, short circuit (A/C amplifier-air mix actuator: 1U-F (L.H.D.) G (R.H.D.), 1V-G (L.H.D.) F (R.H.D.))
• Air mix actuator
|
Moving towards HOT
|
12
|
1V
|
Motor operation
|
Air mix actuator
|
Moving towards COLD
|
12
|
• Wiring harness: continuity, short circuit (A/C amplifier-air mix actuator: 1U-F (L.H.D.) G (R.H.D.), 1V-G (L.H.D.) F (R.H.D.))
• Air mix actuator
|
Moving towards HOT
|
1.0 or less
|
1W
|
Motor operation
|
Airflow mode actuator
|
Switched to DEFROSTER
|
12
|
• Wiring harness: continuity, short circuit (A/C amplifier-airflow mode actuator: 1W-G, 1X-F)
• Airflow mode actuator
|
Switched to VENT
|
1.0 or less
|
1X
|
Motor operation
|
Airflow mode actuator
|
Switched to DEFROSTER
|
1.0 or less
|
• Wiring harness: continuity, short circuit (A/C amplifier-airflow mode actuator: 1W-G, 1X-F)
• Airflow mode actuator
|
Switched to VENT
|
12
|
2A
|
B+
|
ROOM 15 A fuse
|
Under any condition
|
B+
|
• Wiring harness: continuity, short circuit (A/C amplifier- fuse: 2F-ROOM 15 A)
• ROOM 15 A fuse
|
2B
|
-
|
-
|
-
|
-
|
-
|
2C
|
IG2
|
A/C 7.5 A fuse
|
IG SW ON
|
B+
|
• Wiring harness: continuity, short circuit (A/C amplifier- fuse: 2C-A/C 7.5 A)
• A/C 7.5 A fuse
|
IG SW LOCK
|
1.0 or less
|
• Wiring harness: continuity, short circuit (A/C amplifier- fuse: 2C-A/C 7.5 A)
|
2D
|
-
|
-
|
-
|
-
|
-
|
2E
|
-
|
-
|
-
|
-
|
-
|
2F
|
-
|
-
|
-
|
-
|
-
|
2G
|
Potentiometer input
|
Airflow mode actuator
|
VENT
|
4.0
|
• Wiring harness: continuity, short circuit (A/C amplifier-airflow mode actuator: 2G-E, 2P-C)
• Airflow mode actuator
• A/C amplifier: terminal voltage (2O)
|
BILEVEL
|
3.3
|
HEAT
|
2.6
|
HEAT/DEF
|
1.8
|
DEFROSTER
|
1.0
|
2H
|
Potentiometer input
|
Air mix actuator
|
Set temperature at MAX COLD
|
3.9
|
• Wiring harness: continuity, short circuit (A/C amplifier-air mix actuator: 2H-E, 2P-A (L.H.D.) C (R.H.D.))
• Air mix actuator
• A/C amplifier: terminal voltage (2O)
|
Set temperature at MAX HOT
|
1.1
|
2I
|
Solar radiation sensor input
|
Solar radiation sensor
|
Incandescent light (approx. 60 W) shined directly on the solar radiation sensor from a distance of approx. 100 mm {3.9 in}
|
4.0
|
• Wiring harness: continuity (A/C amplifier-solar radiation sensor: 2I-B, 2O-A)
• A/C amplifier: terminal voltage (2O)
• Solar radiation sensor
|
Blocking light to solar radiation sensor
|
1.0 or less
|
2J
|
Evaporator temperature sensor input
|
Evaporator temperature sensor
|
Compared with temperature detected by evaporator temperature sensor
|
Refer to graph 1
|
• Wiring harness: continuity (A/C amplifier-evaporator temperature sensor: 2J-B, 2P-A)
• Wiring harness: short circuit (A/C amplifier-evaporator temperature sensor: 2J-B)
• Evaporator temperature sensor
• A/C amplifier: terminal voltage (2C, 2N)
|
2K
|
Ambient temperature sensor input
|
Ambient temperature sensor
|
Compared with temperature detected by ambient temperature sensor
|
Refer to graph 2
|
• Wiring harness: continuity (A/C amplifier-ambient temperature sensor: 2K-B, 2P-A)
• Wiring harness: short circuit (A/C amplifier-ambient temperature sensor: 2K-B)
• Ambient temperature sensor
• A/C amplifier: terminal voltage (2C, 2N)
|
2 L
|
Cabin temperature sensor input
|
Cabin temperature sensor
|
Compared with temperature detected by cabin temperature sensor
|
Refer to graph 3
|
• Wiring harness: continuity (A/C amplifier-cabin temperature sensor: 2L-B, 2P-A)
• Wiring harness: short circuit (A/C amplifier-cabin temperature sensor: 2L-B)
• Cabin temperature sensor
• A/C amplifier: terminal voltage (2C, 2N)
|
2M
|
ECT sensor input
|
PCM
|
Compared with temperature detected by ECT sensor
|
Refer to graph 4
|
• Wiring harness: continuity, short circuit (A/C amplifier-PCM: 2M-5W)
• ECT sensor
• A/C amplifier: terminal voltage (2C, 2N)
|
2N
|
GND
|
Body ground
|
Under any condition
|
1.0 or less
|
• Wiring harness: continuity (A/C amplifier-GND: 2N-GND)
|
2O
|
+5 V
|
• Air mix actuator
• Airflow mode actuator
• Solar radiation sensor
|
IG SW ON
|
5.0
|
• Wiring harness: short circuit (A/C amplifier-air mix actuator, airflow mode actuator, solar radiation sensor: 2O-C (L.H.D.) A (R.H.D.), A, A)
• Air mix actuator
• Airflow mode actuator
• Solar radiation sensor
• A/C amplifier: terminal voltage (2C, 2N)
|
IG SW LOCK
|
1.0 or less
|
• A/C amplifier replacement
|
2P
|
Sensor GND
|
• Ambient temperature sensor
• Cabin temperature sensor
• Evaporator temperature sensor
• Air mix actuator
• Airflow mode actuator
|
Under any condition
|
1.0 or less
|
• A/C amplifier: terminal voltage (2N)
|