2005 TOYOTA AVENSIS Circuit

I36144
TRSG±5
A16A15
± DIAGNOSTICSAIR CONDITIONING SYSTEM
05±1103
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 INSPECT AIR CONDITIONING AMPLIFIER(TR ± SG±5)
(a) Remove the A/C amplifier with connectors being con-
nected.
(b) Turn the ignition switch to ON.
(c) Measure the voltage between terminal TR and SG±5 of
A/C amplifier connector at each temperature.
Standard:
1.8 to 2.2 V at 25
C (77
F)
1.2 to 1.6 V at 40
C (104
F)
HINT:
As the temperature increases, the voltage decreases.
OK PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN ON PROBLEM SYMPTOMS TABLE
NG

±
DIAGNOSTICS AIR CONDITIONING SYSTEM
05±1105
AVENSIS REPAIR MANUAL (RM1018E)
3CHECK HARNESS AND CONNECTOR(COOLER (ROOM TEMP. SENSOR)
THERMISTOR ± A/C AMPLIFIER)
(a)Check for an open or short circuit in harness and connector between terminal TR an\
d SG±5 of A/C
amplifier (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
4 READ OUTPUT DTC
(a) Clear the DTCs.
(b) Read the DTC at least 8.5 minutes after turning the ignition switch ON. Standard: Normal codes are output.
MG REPLACE AIR CONDITIONING AMPLIFIER
OK
SYSTEM OK

050TM±13
05±1100
±
DIAGNOSTICS AIR CONDITIONING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
PROBLEM SYMPTOMS TABLE
If the normal code is displayed during DTC check although the problem still occurs, check the circuits for
each problem symptom in the order given in the table below, and proceed to the relevant troubleshooting.
SymptomSuspect AreaSee page
Whole functions of the A/C system does not operate.
1. IG power source circuit
2. A/C amplifier assy
3. Engine ECU 1AZ±FSE: 1AZ±FE:
1ZZ±FE/3ZZ±FE:
1CD±FTV:05±1144
05±1098 05±294
05±149 05±5
05±528
Air Flow Control : No blower operation
1. Blower motor circuit
2. Heater relay circuit
3. Blower w/fan motor sub±assy
4. A/C amplifier assy05±1148
05±1146
05±1148
05±1098
Air Flow Control : No blower control1. Blower motor circuit05±1148
Air Flow Control : Insufficient air out
1. Blower w/fan motor sub±assy
2. Blower motor circuit
3. A/C amplifier assy05±1148
05±1148
05±1098
Temperature Control : Cool air does not come out
1. Volume of refrigerant
2. Drive belt tension
3. Refrigerant pressure
4. Air conditioner magnetic valve circut
5. Pressure sensor circuit
6. Air mix control servomotor circuit
7. Air mix damper position sensor circuit
8. Room temp. sensor circuit
9. Ambient temp. sensor circuit
10.A/C amplifier assy55±24
55±46
55±24
05±1151 05±1116
05±1133
05±1122
05±1102
05±1106
05±1098
Temperature Control : Warm air does not come out
1. Air mix control servomotor circuit
2. Air mix damper position sensor circuit
3. Ambient temp. sensor circuit
4. Room temp. sensor circuit
5. A/C amplifier assy
6. Heater radiator05±1133
05±1122
05±1106
05±1102
05±1098
±
Temperature Control : Output air is warmer or cooler than the set
temperature or response is slow.
1. Room temp. sensor circuit
2. Ambient temp. sensor circuit
3. Solar sensor circuit
4. Air mix damper position sensor circuit
5. Air mix control servomotor circuit
6. Evaporator temp. sensor circuit
7. A/C amplifier assy05±1102
05±110605±1113
05±1122
05±1133
05±1109
05±1098
Temperature Control : No temperature control (only Max. cool or Max. warm)
1. Room temp. sensor circuit
2. Ambient temp. sensor circuit
3. Solar sensor circuit
4. Air mix damper position sensor circuit
5. Air mix control servomotor circuit
6. Evaporator temp. sensor circuit
7. A/C amplifier assy05±1102
05±1106
05±1113
05±1122
05±1133
05±1109
05±1098
No air inlet control1. Recirculation damper servomotor circuit
2. A/C amplifier assy05±1153
05±1098
No air outlet control
1. Air outlet damper position sensor circuit
2. Air outlet control servomotor circuit
3. A/C amplifier assy05±1126
05±1136
05±1098

±
DIAGNOSTICS AIR CONDITIONING SYSTEM
05±1101
AVENSIS REPAIR MANUAL (RM1018E)
Engine idle up does not occur, or is continuous
1. Air conditioner magnetic valve circut
2. A/C amplifier assy
3. Engine ECU 1AZ±FSE:
1AZ±FE:
1ZZ±FE/3ZZ±FE:
1CD±FTV:05±1151
05±1098 05±294
05±149 05±5
05±528
Set temperature value displayed does not much up with operation
of temperature control switch.1. Air conditioner magnetic valve circut
2. A/C amplifier assy05±1151
05±1098
Brightness does not change when light control switch it turned.1. Illumination light system
2. A/C amplifier assy±
05±1098
Unable to access the diagnosis mode.1. A/C amplifier assy05±1098
DTC is not recorded. Set mode is cleared when IG switch is
turned off.1. Back±up power source circuit
2. A/C amplifier assy05±1142
05±1098
Hot gas heater:
SymptomSuspect AreaSee page
Warm wind does not blow out even if the gas heater switch is
turned on before the water temperature rises under the condition
where the ordinal A/C correctly operates.1. Hot gas heater magnetic valve circuit
2. Hot gas heater switch circuit
3. A/C amplifier assy05±1157
05±1159
05±1098

05C7K±01
I36145
A15A16
1211
2423 19 1615
20191817161514131211 8 7 6 5 4 3 2 1
10 9 8 7 6 5 4 3 2 1 10 9
2221 1817 141320 05±1098
± DIAGNOSTICSAIR CONDITIONING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
TERMINALS OF ECU
1. AIR CONDITIONER AMPLIFIER ASSY
Terminal No. (Symbols)Wiring ColorConditionSpecification
A16±5 (BLW) ±
A16±13 (GND)R ± W±BIG SW: ON
Front blower: OperatePulse generation
A16±7 (PRE) ±
A16±18 (SG)L±W ± G±W
Start engine
Refrigerant pressure: 0 kPa (0 kgf/cm2, 0 psi)
3,138 MPa
(32.0 kgf/cm2, 455 psi)
0.5
4.8 V
A15±20 (MPX±) ±
A16±13 (GND)P ± W±BMultiplex communication circuit±
A15±10 (MPX+) ±
A16±13 (GND)P±B ± W±BMultiplex communication circuit±
A15±6 (FRS) ±
A16±13 (GND)P±B ± W±BIG SW: ON
R/F SW: RECIRCULATION
FRESH10 to 14
Below 1.0 V
A15±5 (REC) ±
A16±13 (GND)R±Y ± W±BIG SW: ON
R/F SW: FRESH
RECIRCULATION10 to 14
Below 1.0 V
A16±17 (HR) ±
A16±13 (GND)GR±R ± W±BIG SW: ON
Front blower: OFF
Operate10 to 14
Below 1.0 V
A15±4 (AOF) ±
A16±13(GND)L±B ± W±BIG SW: ON
Mode switch: DEF.
FACEBelow 1.0
10 to 14 V
A15±3 (AOD) ±
A16±13 (GND)LG±B ± W±BIG SW: ON
Mode switch: FACE
DEF.Below 1.0
10 to 14 V
A16±12 (IG) ±
A16±13 (GND)R±W ± W±BIG SW: LOCK
ONBelow 10 to 14 V
A15±2 (AMPH) ±
A16±13 (GND)W ± W±BIG SW: ON
Set passenger side temp.: MAX. COOL
MAX. HOTBelow 1.0
10 to 14 V
A15±1 (AMPC) ±
A16±13 (GND)Y ± W±BIG SW:
Set passenger side temp.: MAX HOT
MAX. COOLBelow 1.0
10 to 14 V
A15±12 (AMDH) ±
A16±13 (GND)P±L ± W±BIG SW:
Set driver side temp.: MAX. COOL
MAX. HOTBelow 1.0
10 to 14 V
A15±11 (AMDC) ±
A16±13 (GND)B ± W±BIG SW:
Set driver side temp.: MAX HOT
MAX. COOLBelow 1.0
10 to 14 V
A16±13 (GND) ±
Body groundW±B ± Body groundAlwaysContinuity
A16±24 (+B) ±
A16±13 (GND)W±R ± W±BAlways10 to 14 V
A16±8 (TPD) ±
A15±14 (SG±2)GR ± Y±RIG SW: ON
Set driver side temp.: MAX HOT
MAX. COOL1.0
4.0 V
A16±20 TPP ±
A15±13 (SG±1)V ± PIG SW: ON
Set passenger side temp.: MAX HOT
MAX. COOL1.0
4.0 V
A16±9 (TSD) ±
A16±13 (GND)LG ± W±BIG SW: ON
Solar sensor subject to electric light0.8 to 3.3 V
A16±21 (TSP) ±
A16±13 (GND)L ± W±BIG SW: ON
Solar sensor subject to electric light0.8 to 3.3 V

I35410
BB WEngine Room R/B No.3Engine Room R/B No.1,
Engine Room J/B No.1Power Heater ECU
3 3 1A 1
12 PWR HTR
P15
+
FL MAIN
Battery
ECW±B W±BJ2
J/C
AAP11
± 1
± DIAGNOSTICSCOMBUSTION TYPE POWER HEATER SYSTEM
05±1171
AVENSIS REPAIR MANUAL (RM1018E)
ECU POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
This is power source for the power heater ECU and power heater fuel pump.
WIRING DIAGRAM
05C80±01

I36137
+
P1
I37732
1 23 4
5 67 8
±P1
05±1172
±
DIAGNOSTICS COMBUSTION TYPE POWER HEATER SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
1CHECK FUSE(PWR HTR)
(a)Remove the PWR HTR from the engine room J/B or R/B No.1.
(b)Check that the continuity exists of PWR HTR fuse. NGREPAIR OR REPLACE FUSE
OK
2INSPECT POWER HEATER ECU(+)
(a)Remove the power heater ECU with connectors being connected.
(b)Turn the ignition switch to ON.
(c)Measure the voltage between terminal º+º of the power heater ECU and body ground.
Standard: 10 to 14 V
NGREPAIR OR REPLACE WIRE HARNESS
OK
3CHECK HARNESS AND CONNECTOR(POWER HEATER ECU ± BODY GROUND)
(a)Check for an open or short circuit in harness and connec- tor between the power heater ECU and body ground
(See page 01±32).
NG REPAIR OR REPLACE WIRE HARNESS
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

05C7Z±01
05±1170
±
DIAGNOSTICS COMBUSTION TYPE POWER HEATER SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
PROBLEM SYMPTOMS TABLE
If the normal code is displayed during DTC check although the problem still occurs, check the circuits for
each problem symptom in the order given in the table below, and proceed to the relevant troubleshooting.
SymptomSuspect AreaSee page
The combustion type power heater does not operate
1. ECU power source circuit
2. Power heater switch circuit
3. Power heater fuel pump circuit
4. Power heater alternator circuit05±1171
05±1173
05±1176
05±1179