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DI-697
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3F3-05

PROBLEM SYMPTOMS TABLE
Front A/C
Symptom Suspect Area See page
3. A/C control assembly IN-31
Whole functions of the A/C system does not operate
4. IG power source circuit DI-749

1. IG power source circuit DI-749
2. Front heater relay circuit DI-756
Air Flow Control: No blower operation
3. Blower motor circuit DI-765
4. A/C control assembly IN-31
1. Blower motor circuit DI-765
Air Flow Control: No blower control 2. A/C control assembly IN-31
3. Solar sensor circuit DI-715
Air Flow Control: Insufficient air flow Blower motor circuit DI-765
1. Refrigerant volume AC-3
2. Drive belt tension AC-17
3. Refrigeration system inspection with manifold gauge set AC-3
4. Compressor circuit DI-776
5. Pressure switch circuit DI-721
Temperature Control: No cool air comes out
6. Front air mix damper position sensor circuit DI-727
7. Front air mix damper control servomotor circuit DI-736
8. Front room temp. sensor circuit DI-712
9. Ambient temp. sensor circuit DI-703
10.A/C control assembly IN-31
1. Front air mix damper position sensor circuit DI-727
2. Front air mix damper control servomotor circuit DI-736
3. Front room temp. sensor circuit DI-712
Temperature Control: No warm air comes out
4. Ambient temp. sensor circuit DI-703
5. Front evaporator temp. sensor circuit DI-706
6. A/C control assembly IN-31

1. Refrigerant volume AC-3
2. Drive belt tension AC-17
3. Refrigeration system inspection with manifold gauge set AC-3
4. Cooling fan system AC-109
5. Solar sensor circuit DI-715
6. Front room temp. sensor circuit DI-712
7. Ambient temp. sensor circuit DI-703
8. Front Evaporator temp. sensor circuit DI-706
Temperature Control: Output air is warmer or cooler that the set
9. Front air mix damper position sensor circuit DI-727
temperature or response is slow
10.Front air mix damper control servomotor circuit DI-736
11.Front air inlet damper position sensor circuit DI-730
12.Front air inlet damper control servomotor circuit DI-739
13.Condenser AC-72
14.Evaporator AC-30
15.Heater radiator AC-77
16.Expansion valve AC-25
17.A/C control assembly IN-31

2001 SIENNA (RM787U)

Author : Date : 851
DI-698
DIAGNOSTICS - AIR CONDITIONING SYSTEM

Symptom Suspect Area See page
1. Front room temp. sensor circuit DI-712
2. Ambient temp. sensor circuit DI-703
Temperature Control: No temperature control (only Max. cool or
3. Front air mix damper position sensor circuit DI-727
Max. warm)
4. Front air mix damper control servomotor circuit DI-736
5. A/C control assembly IN-31
1. Front air inlet damper position sensor circuit DI-730
No air inlet control 2. Front air inlet damper control servomotor circuit DI-739
3. A/C control assembly IN-31
1. Air outlet damper control servomotor circuit DI-744
No air flow control
2. A/C control assembly IN-31

1. Compressor circuit DI-776
Engine idle up does not occur, or is continuous
2. ECM DI-19

1. Igniter circuit DI-754
A/C indicator blinking 2. Compressor lock sensor circuit DI-718
3. A/C control assembly DI-19

2001 SIENNA (RM787U)

Author : Date : 852
DI-699
DIAGNOSTICS - AIR CONDITIONING SYSTEM

Rear A/C
Symptom Suspect Area See page
1. IG power source circuit DI-749
Whole functions of the rear A/C system does not operate
2. A/C control assembly IN-31

1. IG power source circuit DI-749
2. Rear CLR relay circuit DI-762
Air Flow Control: No blower operation (for rear cooling)
3. Rear blower motor circuit DI-768
4. A/C control assembly IN-31

1. IG power source circuit DI-749
2. Rear heater relay circuit DI-759
Air Flow Control: No blower operation (for rear heater)
3. Rear blower motor circuit DI-772
4. A/C control assembly IN-31

1. Rear blower motor circuit DI-772
Air Flow Control: No blower control (for rear cooling) 2. A/C control assembly IN-31
3. Solar sensor circuit DI-715
1. Rear blower motor circuit DI-768
Air Flow Control: No blower control (for rear heater) 2. A/C control assembly IN-31
3. Solar sensor circuit DI-715
Air Flow Control: Insufficient air flow (for rear cooling) 1. Rear blower motor circuit DI-768
Air Flow Control: Insufficient air flow (for rear heater) 1. Rear blower motor circuit DI-768
1. Refrigerant volume AC-3
2. Drive belt tension AC-17
3. Refrigeration system inspection with manifold gauge set AC-3
4. Expansion valve AC-33
5. Evaporator AC-38
Temperature Control: No cool air comes out
6. Compressor circuit DI-776
7. Rear air mix damper position sensor circuit DI-733
8. Rear air mix damper control servomotor circuit DI-742
9. Rear room temp. sensor circuit DI-712
10.A/C control assembly IN-31
1. Rear air mix damper position sensor circuit DI-733
2. Rear air mix damper control servomotor circuit DI-742
Temperature Control: No warm air comes out 3. Rear room temp. sensor circuit DI-712
4. Rear air intake temp. sensor circuit DI-724
5. A/C control assembly IN-31
1. Refrigerant volume AC-3
2. Drive belt tension AC-17
3. Refrigeration system inspection with manifold gauge set AC-3
4. Cooling fan system AC-109
5. Solar sensor circuit DI-715
6. Rear room temp. sensor circuit DI-712
Temperature Control: Output air is warmer or cooler that the set 7. Rear air intake temp. sensor circuit DI-724
temperature or response is slow 8. Rear air mix damper position sensor circuit DI-733
9. Rear air mix damper control servomotor circuit DI-742
10.Condenser AC-72
11.Evaporator AC-33
12.Heater radiator AC-51
13.Expansion valve AC-33
14.A/C control assembly IN-31
1. Rear room temp. sensor circuit DI-712
Temperature Control: No temperature control (only Max. cool or 2. Rear air mix damper position sensor circuit DI-733
Max. warm) 3. Rear air mix damper control servomotor circuit DI-742
4. A/C control assembly IN-31

2001 SIENNA (RM787U)

Author : Date : 853

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