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DI-689
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI8AC-01
0.5 Seconds PRE-CHECK
1. WARNING FOR A/C COMPRESSOR LOCK
If compressor lock occurs during A/C operation, the A/C switch
ON indicator on the A/C control assembly starts blinking.
When this occurs, check for compressor lock (DTC 22) using
OFF
diagnosis trouble code check then proceed to inspect the circuit
or the component.
Compressor lock sensor circuit. (See page DI-718 )
0.5 Seconds AT0716
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.
Turn ignition switch ON with AUTO and
R/F switches held down.
If both AUTO switch and R/F switch
are not pressed at the same time.
Indicator Check
R/F
OFF DTC Check OFF
(Sensor Check) AUTO Actuator Check
(continuous operation) (continuous operation)
DEF DEF
R/F R/F
DTC Check OFF
OFF Actuator Check
(Sensor Check) AUTO AUTO
(stepped operation) (stepped operation)
DEF DEF
Cancel check mode and can start
A/C control
: Indicates a switch operation.
2001 SIENNA (RM787U)
Author : Date : 843
DI-690
DIAGNOSTICS - AIR CONDITIONING SYSTEM
3. INDICATOR CHECK
"AUTO" Switch (a) Turn the ignition switch to on while pressing the A/C con-
trol AUTO switch and R/F switch simultaneously.
"R/F" Switch
I19701
Blinking Pattern (b) Check that all the indicators light up and go off at 1 second
intervals 4 times in succession.
4 times
1 sec. HINT:
1 sec. S After the indicator check is ended, the diagnostic trouble
ON
code check begins automatically.
S Press the OFF switch when desiring to cancel the check
OFF
mode.
AC2163
4. DTC CHECK (SENSOR CHECK)
DTC Display (a) Perform an indicator check. After the indicator check is
completed, the system enters the DTC check mode auto-
matically.
(b) Read the DTC displayed on the panel. Refer to the list of
DTCs on page DI-692 when reading the DTCs.
(DTCs are out put at the temperature display.)
If the slower display is desired, press the Temp. Control
I19701 Switch and change it to step operation. Each time the
Temp. Control switch is pressed, the display changes by
1 step.
Engine Room J/B No. 2 5. CLEARING DTC
(a) Pull out the DOME fuse in engine room J/B No. 2 for 10
sec. or longer to clear diagnostic the DTC's memory.
(b) After reinserting the fuse, check that the normal code is
DOME Fuse
output.
I04416
2001 SIENNA (RM787U)
Author : Date : 844
DI-691
DIAGNOSTICS - AIR CONDITIONING SYSTEM
6. ACTUATOR CHECK
Code Display (a) After entering the sensor check mode, press the R/F
"A/C" Switch
switch.
(b) Since each damper, motor and relay automatically oper-
ates at 1 second intervals beginning in order from 20 in
the temperature display, check the temperature and air
flow visually and by hand.
If a slower display is desired, press the A/C switch and
"OFF" Switch "R/F" Switch change it to step operation. Each time the A/C switch is
I19701
pressed, the display changes by 1 step.
HINT:
S The buzzer sounds when the display trouble code
changes.
S Code are displayed in order from the smaller to the larger
numbers.
S To cancel the check mode, press the OFF switch.
Conditions
Display
Step No. code Blower Air flow Air inlet Magnetic Air mix
motor vent damper clutch damper
FACE OFF Cool side
1 0 OFF FRESH
(-10% open)
2 1 LO
R/F
3 2 MED ON
(54.5% open)
4 3
Cool / Hot
5 4 (RECIRC) (50% open)
BI-LEVEL*1
6 5 (52.0% open)
FOOT*2 Hot side
7 6 (31.0% open) (110% open)
8 7
9 8 FOOT/DEF
10 9 HI DEF
*1: There is air leakage from defroster.
*2: There is no air leakage from defroster.
2001 SIENNA (RM787U)
Author : Date : 845
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