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AC-14
AIR CONDITIONING - TROUBLESHOOTING (Manual A/C)

TROUBLESHOOTING (Manual A/C)
AC3BH-01

PROBLEM SYMPTOMS TABLE
Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in order. If necessary, replace these parts.
Front A/C:
Symptom Suspect Area See page
3. HTR Fuse -
4. Front heater relay AC-102
5. Blower motor AC-82
No blower operation
6. Blower resistor AC-84
7. Blower speed control switch AC-122
8. Wire harness -

1. Blower speed control switch AC-122
2. Blower resistor AC-84
No blower control
3. Blower motor AC-82
4. Wire harness -

No air flow mode control 1. A/C control assembly AC-1 18
1. Air inlet control servomotor AC-57
Air inlet control: No air inlet control when air REC switch is
2. A/C control assembly (Instegration switch) AC-122
opeated
3. Wire harness -
1. A/C control assembly (Air flow selector) AC-122
Air inlet control: Recirculation mode does not change when turn 2. A/C control assembly (integration switch) AC-122
air flow selector to FOOT/DEF or DEF position. 3. Air inlet servomotor AC-82
4. Wire harness -

No temperature control 1. A/C control assembly AC-1 18
1. Refrigerant volume AC-3
2. Drive belt AC-17
3. Magnetic clutch AC-60
4. Compressor AC-60
5. HTR Fuse -
No compressor operation
6. A/C Fuse -
7. A/C switch AC-122
8. A/C amplifier AC-133
9. Pressure switch AC-99
10.Wire harness -
1. Refrigerant volume AC-3
2. Refrigerant pressure AC-3
3. Drive belt AC-17
No cool air comes out 4. Compressor AC-60
5. Thermistor AC-25
6. Pressure switch AC-99
7. A/C control assembly AC-1 18
1. Refrigerant volume AC-3
2. Drive belt AC-17
3. Magnetic clutch AC-60
4. Compressor AC-60
5. Condenser AC-72
6. Receiver AC-69
Insufficient cooling
7. Expansion valve AC-25
8. Evaporator AC-30
9. Refrigerant line AC-22
10.Pressure switch AC-99
11.A/C amplifier AC-133
12.A/C control assembly AC-1 18
2001 SIENNA (RM787U)

Author : Date : 1855
AC-15
AIR CONDITIONING - TROUBLESHOOTING (Manual A/C)

1. Engine coolant volume -
2. Water valve AC-79
No warm air comes out
3. A/C control assembly AC-1 18
4. Heater radiator AC-77

1. A/C switch AC-122
No engine idle-up when compressor operate 2. A/C amplifier AC-133
3. Idle control system DI-100
1. Compressor AC-60
Blinking of A/C indicator 2. Drive belt AC-17
3. A/C amplifier AC-133
1. ALT Fuse -
2. HTR Fuse -
3. Fan No.1 relay AC-107
4. CDS Fuse -
No condenser fan operation (High speed) 5. Condenser fan motor AC-109
6. Fan No.2 relay AC-107
7. Pressure switch AC-99
8. No.1 Engine coolant temp. switch AC-139
9. Wire harness -
1. Heater Fuse -
2. Fan No.3 relay AC-107
3. A/C amplifier AC-133
4. No.2 Engine coolant temp. switch AC-139
5. CDS Fuse -
6. Condenser fan motor AC-109
No condenser fan operation (Low speed)
7. Fan No.2 relay AC-107
8. Radiator fan motor CO-19
9. Fan No.1 relay AC-107
10.Pressure switch AC-99
11.No.1 Engine coolant temp. switch AC-139
12.Wire harness -

2001 SIENNA (RM787U)

Author : Date : 1856
AC-16
AIR CONDITIONING - TROUBLESHOOTING (Manual A/C)

Rear A/C:
Symptom Suspect Area See page
1. Heater Fuse -
2. RR A/C Fuse -
3. Rear heater relay AC-103
4. Blower motor AC-51
AC-83
5. Rear relay AC-104
No blower operation 6. Blower resistor AC-85
AC-86
7. Rear LO, M1, M2 and HI relay AC-104 ,
AC-106
8. Heater blower switch AC-137
9. Rear blower switch AC-130
10.Wire harness -

1. Blower motor AC-51
AC-83
2. Rear relay AC-104
3. Blower resistor AC-85
AC-86
No blower control
4. Rear LO, M1, M2 and HI relay AC-104 ,
AC-106
5. Heater blower switch AC-137
6. Rear blower switch AC-130
7. Wire harness -
1. HTR Fuse
2. Front heater relay AC-102
3. A/C Fuse -
No temperature control 4. Rear A/C control assembly AC-130
5. A/C amplifier AC-133
6. Air mix servomotor AC-91
7. Wire harness -
1. Refrigerant volume AC-3
2. Expansion valve AC-33
3. Evaporator AC-38
4. Refrigerant line AC-22
No cool air comes out
5. Rear A/C control assembly AC-130
6. A/C amplifier AC-133
7. Rear relay AC-104
8. Wire harness -
1. Engine coolant volume -
2. Heater radiator AC-51
3. Rear A/C control assembly AC-130
No warm air comes out 4. A/C amplifier AC-133
5. Air mix servomotor AC-91
6. Rear relay AC-104
7. Wire harness -

2001 SIENNA (RM787U)

Author : Date : 1857

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