2001 TOYOTA SEQUOIA air conditioning

DI±2308
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2502 Author: Date:
2005 SEQUOIA (RM1146U)Symbols (Terminals No.)
Wiring ColorTerminal DescriptionConditionSpecified Condition
RrTP e RrSG
(I21±18 e I21±10)*1W e L±RRear air mix damper posi-
tion sensor signalRr temp. control switch: Max.
COOL " Max. HOT4.0 to 1.0 V
AC1 e GND
(I22±4 e I19±10)G ± B e OCompressor operation
signalIG ON, A/C switch: OFF " ON3.7 to 4.5 "
1.3 to 2.6 V
RrFACE2 e GND
(I21±11 e I19±10)*1P±B e ORear air outlet control ser-
vomotor operation signalRr A/C control panel switch: except
FACE " FACE10 to 14 "
Below 1.0 V
RrBLK (I21±4)*1LG±BCommunication signal
Communication circuit
(Built in Fr. A/C control panel " Rr.
A/C control panel)
±
RrSTX (I21±14)*1G±YCommunication signal
Communication circuit
(Built in Fr. A/C control panel " Rr.
A/C control panel)
±
RrVM e GND
(I21±7 e I19±10)*1W±G e ORear blower motor control
signalRr blower control switch: LO " MID
" HI7.2 " 4.2 " 0.5 V
RrHR e GND
(I22±7 e I19±10)*1L±O e ORear blower motor opera-
tion signalRr blower control switch: OFF "
LO10 to 14
"Below 1.0 V
RrBLW e GND
(I21±16 e I19±10)*1L e ORear blower motor opera-
tion signalRr blower control switch: OFF "
LOBelow 1.0 "
1.5 to 3.0 V
RrFACE e GND
(I21±2 e I19±10)*1Y±B e ORear air outlet control ser-
vomotor control signalRr A/C control panel FACE switch:
OFF " ON10 to 14 "
Below 1.0 V while
switch is pushed
RrB/L e GND
(I21±3 e I19±10)*1BR±W e ORear air outlet control ser-
vomotor control signalRr A/C control panel B/L switch:
OFF " ON10 to 14 "
Below 1.0 V while
switch is pushed
RrFOOT e GND
(I21±13 e I19±10)*1G±R e ORear air outlet control ser-
vomotor control signalRr A/C control panel FOOT switch:
OFF " ON10 to 14 "
Below 1.0 V while
switch is pushed
RrTE e RrSG LG RLRRear evaporator tempera-Rr evaporator temp.: 0°C (32°F)2.0 to 2.4 VRrTE e RrSG
(I21±17 e I21±10)*1LG±R e L±RRear eva orator tem era
ture sensor signalRr evaporator temp.: 15°C (59°F)2.0 to 2.4 V
RrB/L2 e GND
(I21±12 e I19±10)*1P±G e ORear air outlet control ser-
vomotor control signalRr A/C control panel switch: except
B/L " B/L10 to 14 "
Below 1.0 V
FOOT eGND
(I21±17 e I19±10)Y±B e OAir outlet control servo-
motor control signalMode control switch except: FOOT
" FOOT10 to 14 " Below 1.0 V
FDEF e GND
(I20±7 e I19±10)LG±R e OAir outlet control servo-
motor control signalMode control switch except: FOOT/
DEF "FOOT/DEF10 to 14 " Below 1.0 V
DEF e GND
(I20±18 e I19±10)B±W e OAir outlet control servo-
motor control signalMode control switch except: DEF "
DEF10 to 14 " Below 1.0 V
AMH e GNDRLOAir mix control servomotorIG ON, Set temp.: Max. CoolBelow 1.0 VAMH e GND
(I20±10 e I19±10)R±L e OAir mix control servomotor
operation signalIG ON, Set temp.: Max. Hot10 to 14 V
S5±AM eSG±TP
(I20±22 e I20±12)R±Y e L±RPower supply for air mix
control servomotorIG ON4.5 to 5.5 V
TP e SG±TPGRLRAir mix damper positionIG ON, Set temp.: Max. Cool3.5 to 4.5 VTP e SG TP
(I20±15 e I20±12)G±R e L±RAir mix dam er osition
sensor signalIG ON, Set temp.: Max. Hot0.5 to 1.5 V
AMC e GNDWLOAir mix control servomotorIG ON, Set temp.: Max. Cool10 to 14 VAMC e GND
(I20±9 e I19±10)W±L e OAir mix control servomotor
control signalIG ON, Set temp.: Max. HotBelow 1.0 V
S5±AI e SG±TPI
(I20±11 e I20±13)L±B e Y±RAir inlet control servomo-
tor control signalIG ON4.5 to 5.5 V
TR e SG±TRLWRWRoom temperature sensorIG ON, Cabin temp.: 25°C (77°F)1.8 to 2.2 VTR e SG TR
(I20±3 e I20±1)L±W e R±WRoom tem erature sensor
signalIG ON, Cabin temp.: 40°C (104°F)1.2 to 1.6 V

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2309
2503 Author: Date:
2005 SEQUOIA (RM1146U)Symbols (Terminals No.)
Wiring ColorTerminal DescriptionConditionSpecified Condition
TS e S5±TSLGBSl i lIG ON08t 43VTS e S5 TS
(I20±14 e I20±21)LG e BSolar sensor signalIG ON0.8 to 4.3 V
AIR e GNDGWOAir inlet control servomo-IG ON, Push FRS switchBelow 1.0 VAIR e GND
(I20±20 e I19±10)G±W e OAir inlet control servomo
tor operation signalIG ON, Push REC switch10 to 14 V
AIF e GNDROAir inlet control servomo-IG ON, Push FRS switch10 to 14 VAIF e GND
(I20±8 e I19±10)R e OAir inlet control servomo
tor operation signalIG ON, Push REC switchBelow 1.0 V
TPI e SG±TPIWYRAir inlet control servomo-IG ON, Push REC switch3.5 to 4.5 VTPI e SG TPI
(I20±16 e I20±13)W e Y±RAir inlet control servomo
tor control signalIG ON, Push FRS switch0.5 to 1.5 V
RTRSG R TRRttIG ON, Rr room temp.: 25°C (77°F)1.8 to 2.2 VRrTR e SG±RrTR
(I22±13 e I22±14)*1GR±R e R±YRear room temperature
sensor signalIG ON, Rr room temp.: 40°C
(104°F)1.2 to 1.6 V
FACE eGND
(I20±5 e I19±10)GR e OAir outlet control servo-
motor control signalMode control switch: except FACE
" FACE10 to 14 " Below 1.0 V
B/L eGND
(I20±6 e I19±10)BR±W e OAir outlet control servo-
motor control signalMode control switch: except BI±
LEVEL " BI±LEVEL10 to 14 " Below 1.0 V
IGN e GNDYGOEi lti i lE i idliPl tiIGN e GND
(I22±3 e I19±10)Y±G e OEngine revolution signalEngine idlingPulse generation
TW e GNDWROEngine coolant tempera-IG ONPl tiTW e GND
(I22±2 e I19±10)W±R e OEngine coolant tem era
ture sensor signalIG ONPulse generation
ACT eGND
(I22±5 e I19±10)LG±B e OCompressor operation
signalIG ON, A/C switch: OFF " ONBelow 1.0 "10 to 14 V
TE e SG±TEGBWGEvaporator temperature
IG ON, Evaporator temp.: 0°C
(32°F)2.0 to 2.4 VTE e SG TE
(I20±4 e I20±2)G±B e W±GEva orator tem erature
sensor signalIG ON, Evaporator temp.: 15°C
(59°F)1.4 to 1.8 V
MGC eGND
(I19±5 e I19±10)L e OMagnetic clutch control
signalEngine start
A/C switch: OFF " ON10 to 14 " Below 1.0 V
LOCK eGND
(I19±9 e I19±10)W±R e OCompressor lock sensor
signalEngine start
A/C switch: OFF " ONPulse generation
*1: w/ Rear A/C

DIDKQ±01
D05981DLC3
I15897
Trouble Code Display
I15897DEF. SW
DI±2310
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2504 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. DTC CHECK USING HAND±HELD TESTER
(a) Hook up the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Read the DTCs following the prompts on the tester
screen.
Refer to the hand±held tester operator's manual for fur-
ther details.
(d) Clear the DTCs.
HINT:
After repairing the malfunctions, clear the DTCs.
(1) Connect the hand±held tester to the DLC3.
(2) Turn the ignition switch to the ON position.
(3) Erase the DTCs following the prompts on the tester
screen.
HINT:
Refer to the hand±held tester operator's manual for further de-
tails.
2. DTC CHECK (SENSOR CHECK)
(a) Perform an indicator check. After the indicator check is
completed, the system enters the DTC check mode auto-
matically (See page DI±2312).
(b) Read the DTC displayed on the panel. Refer to the list of
DTCs on page DI±2317 when reading the DTCs (DTCs
are output on the temperature display.).
If the slower display is desired, press the DEF. SW and
change it to step operation. Each time the Temp. Control
switch is pressed, the display changes by 1 step.

I22575
DOME Fuse Engine Room J/B
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2311
2505 Author: Date:
2005 SEQUOIA (RM1146U)
3. CLEARING DTC
(a) Pull out the DOME fuse from the engine room J/B for 10
sec. or longer to clear the diagnostic DTC's memory.
(b) After reinserting the fuse, check that the normal code is
output.

DIDKR±01
AT0716
0.5 Seconds
0.5 Seconds ON
OFF
Turn ignition switch ON with AUTO and
R/F switches held down.
Indicator Check
DTC Check
(Sensor Check)
(continuous operation)
DTC Check
(Sensor Check)
(stepped operation)
Cancel check mode and start A/C
control Actuator Check
(continuous operation)
Actuator Check
(stepped operation) AUTO switch and R/F switch are
not pressed at the same time.
OFF
OFF
OFF
OFF R/F
R/FR/F AUTO
AUTO
AUTO
: Indicates a switch operation.
DEFDEF
DEFDEF
R/F: Recirculation/Fresh select switch
DEF: Defogger switch DI±2312
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2506 Author: Date:
2005 SEQUOIA (RM1146U)
CHECK MODE PROCEDURE
1. WARNING FOR A/C COMPRESSOR LOCK
If compressor lock occurs during A/C operation, the A/C switch
indicator on the A/C control assembly starts blinking.
When this occurs, check for compressor lock (DTC 22) using
diagnosis trouble code check then proceed to inspect the circuit
or the component.
Compressor lock sensor circuit. " (See page DI±2339)
2. LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the diag-
nosis check mode.

A04550
12345678
9 1 0 111 21 31 41 51 6
DLC3
I15897
AUTO S/W
R/F S/W
AC2163
Blinking Pattern
4 times
1 sec.
1 sec.
ON
OFF
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2313
2507 Author: Date:
2005 SEQUOIA (RM1146U)
3. CHECK DLC3
The vehicle's ECM uses the ISO 9141±2 communication proto-
col. The terminal arrangement of the DLC3 complies with SAE
J1962 and matches the ISO 9141±2 format.
Symbols (Terminal No.)Terminal DescriptionConditionSpecified Condition
SIL (7) ± SG (5)Bus º+º lineDuring transmissionPulse generation
CG (4) ± Body groundChassis groundAlwaysBelow 1 W
SG (5) ± Body groundSignal groundAlwaysBelow 1 W
BAT (16) ± Body groundBattery positiveAlways11 to 14 V
4. INDICATOR CHECK
(a) Turn the ignition switch on while pressing the A/C control
AUTO switch and R/F SW simultaneously.
(b) Check that all the indicators light up and go off at 1 second
intervals 4 times in succession.
HINT:

After the indicator check is ended, the diagnostic trouble
code check begins automatically.

Press the OFF switch when desiring to cancel the check
mode.

DIDKS±01
DI±2314
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2508 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
From the DATA LIST displayed on the hand±held tester, you can read the values of the displays, sensors,
actuators and so on without part removal. Reading the DATA LIST as the first step of troubleshooting is one
way to shorten labor time.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) From the display on the tester, select ºDATA LISTº.
AIR CONDITIONING:
ItemMeasurement Item / Display
(Range)Normal ConditionDiagnostic Note
ROOM TEMP
Room temperature sensor /
min.: ±6.5°C (20.3°F)
max.: 57.25°C (135.05°F)Actual room temperature is dis-
played
Open in the circuit:
±6.5°C (20.3°F)
Short in the circuit:
57.25°C (135.05°F)
AMBI TEMP SENS
Ambient temperature sensor /
min.: ±30.8°C (±23.44°F)
max.: 50.8°C (123.44°F)Actual ambient temperature is dis-
played
Open in the circuit:
±30.8°C (±23.44°F)
Short in the circuit:
50.8°C (123.44°F)
EVAP TEMP
Evaporator temperature sensor /
min.: ±29.7°C (±21.46°F)
max.: 59.55°C (139.19°F)Actual evaporator temperature is
displayed
Open in the circuit:
±29.7°C (±21.46°F)
Short in the circuit:
59.55°C (139.19°F)
SOLAR SENS±DSolar sensor (Driver side) /
min.: 0 max.: 255Increases as brightness increasesOpen in the circuit: 0
Short in the circuit: 255
COOLANT TEMP
Engine coolant temperature /
min.: 1.3°C (34.34°F)
max.: 90.55°C (194.99°F)Actual engine coolant temperature
is displayed while the engine is
warmed up
±
SET TEMP±DSet temperature (Driver side) /
min.: 0 max.: 255Set temperature and displayed
temperature are the same±
ESTIMATE TEMP±D
Estimated temperature (Driver
side) / min.: ±200°C (±328°F)
max.: 200°C (392°F)Damper is at ºMAX. COOLº:
±200°C (±328°F)
Damper is at ºMAX. HOTº:
200°C (392°F)
±
A/M DAMP POS±DAir mix damper position (Driver
side) / min.: ±14% max.: 113.5%
Damper is at ºMAX. COOLº:
±10.0%
Damper is at ºMAX. HOTº:
100.0%
±
A/I DAMP POSAir inlet damper position /
min.: ±9% max.: 109%
Damper is at ºRECIRCULATIONº:
±9%
Damper is at ºFRESHº: 109.0%
Damper is at ºHALF±RECIR-
CULATIONº: 30.0 to 80.0%
Open in the circuit: 50.0%
A/M DAMP TARG±D
Air mix damper target position
(Driver side) /
min.: ±14% max.: 113.5%Damper is at ºMAX. COOLº:
±10.0%
Damper is at ºMAX. HOTº:
100.0%
±
A/I DAMP TARGAir inlet damper target position /
min.: ±9% max.: 109%
Damper is at ºRECIRCULATIONº:
±9%
Damper is at ºFRESHº: 109.0%
Damper is at ºHALF±RECIR-
CULATIONº: 30.0 to 80.0%
Open in the circuit: 50.0%

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2315
2509 Author: Date:
2005 SEQUOIA (RM1146U)BLOWER LEVEL
Blower motor speed level /
min.: Level 0 max.: 31Increases within a range between
0 and 31 as the speed increases.±
AMBI TEMP
Adjusted ambient temperature /
min.: ±30.8°C (±23.44°F)
max.: 50.8°C (123.44°F)
±±
SET TEMP SHIFTShift set temperature / +2C, +1C,
NORMAL, ±1C, ±2CCustomized value will be dis-
played±
AIR INLET MODEAir inlet mode / AUTO, MANUALCustomized value will be dis-
played±
COMPRESSOR MODECompressor mode / AUTO,
MANUALCustomized value will be dis-
played±
COMPRS/DEF OPERCompressor / DEF operation
mode / LINK, NORMALCustomized value will be dis-
played±
FOOT/DEF MODEFoot / DEF auto mode / ON, OFFCustomized value will be dis-
played±
DESTINATION
Destination / DOMEST, USA, EU-
ROPE, AUSTRAL, MIDEAST, NO
INFO
Changes with destination±
REAR ROOM TEMP
Room temperature sensor (Rear) /
min.: ±6.5°C (20.3°F)
max.: 57.25°C (135.05°F)Actual room temperature is dis-
played
Open in the circuit:
±6.5°C (20.3°F)
Short in the circuit:
57.25°C (135.05°F)
R±EVAP TEMP
Evaporator temperature sensor /
min.: ±29.7°C (±21.46°F)
max.: 59.55°C (139.19°F)Actual evaporator temperature is
displayed
Open in the circuit:
±29.7°C (±21.46°F)
Short in the circuit:
59.55°C (139.19°F)
SET TEMP REARSet temperature (Rear side) /
min.: 0 max.: 255Set temperature and displayed
temperature are the same.±
ESTIMATE TEMP±R
Estimated temperature (Rear side)
/ min.: ±200°C (±328°F)
max.: 200°C (392°F)Damper is at ºMAX. COOLº:
±200°C (±328°F)
Damper is at ºMAX. HOTº:
200°C (392°F)
±
A/M DAMP POS±RAir mix damper position (Rear
side) / min.: ±14% max.: 113.5%
Damper is at ºMAX. COOLº:
±10.0%
Damper is at ºMAX. HOTº
100.0%
±
A/M DAMP TARG±R
Air mix damper target position
(Rear side) /
min.: ±14% max.: 113.5%Damper is at ºMAX. COOLº:
±10.0%
Damper is at ºMAX. HOTº
100.0%
±
BLOWER LEVEL±RBlower motor speed level /
min.: Level 0 max.: 31Increases within a range between
0 and 31 as the speed increases.±
#CODESNumber of trouble codes /
min.: 0 max.: 255Number of DTCs will be displayed±
ENGINE AND ECT / ALL:
ItemMeasurement Item / Display
(Range)Normal ConditionDiagnostic Note
A/C SIGA/C signal / ON or OFFA/C ON: ON±
A/C MAG CLUTCHA/C magnet clutch / ON or OFFA/C magnet clutch ON: ON±