Toyota Tundra. Manual — part 2393

3. INDICATOR CHECK

a. Press and hold the A/C control AUTO switch and Recirculation/Fresh switch simultaneously, and

turn the ignition switch ON. Continue holding the 2 switches until the panel diagnosis mode begins.

Fig. 24: Identifying A/C Control Auto Switch
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Check that all indicators turn on and off 4 times in succession at 1 second intervals.

HINT:



After the indicator check is completed, the system enters the DTC mode automatically.



Press the "OFF" switch to cancel the indicator check.

Fig. 25: Identifying Blinking Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CHECK MODE PROCEDURE

1. 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

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

diagnostic check mode.

Fig. 26: A/C Control Switches Flow Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DATA LIST/ACTIVE TEST

1. READ DATA LIST

HINT:

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Using the Techstream to read the Data List allows the values or states of switches, sensor, actuators and
other items to be read without removing any parts. This non-intrusive inspection can be very useful
because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading
the Data List information early in troubleshooting is one way to save diagnostic time.

a. Warm up the engine.

b. Turn the ignition switch OFF.

c. Connect the Techstream to the DLC3.

d. Turn the ignition switch ON.

e. Turn the Techstream on.

f. Enter the following menus: Body Electrical/(desired menu)/Data List.

g. According to the display on the Techstream, read the "Data List".

Air Conditioner

DATA LIST

NOTE:

In the table below, the values listed under "Normal Condition" are
reference values. Do not depend solely on these reference values when
deciding whether a part is faulty or not.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

Room Temperature

Sensor

Room temperature sensor/Min.: -
6.5°C (20.3°F)
Max.: 57.25°C (135.05°F)

Actual room temperature
for front seat is displayed

Open in circuit:
-6.5°C (20.3°F)
Short in circuit:
57.25°C
(135.05°F)

Ambient Temp

Sensor

Ambient temperature
sensor/Min.: -23.3°C (-9.94°F)
Max.: 65.95°C (150.71°F)

Actual ambient
temperature is displayed

Open in circuit:
-23.3°C (-9.94°
F)
Short in circuit:
65.95°C
(150.71°F)

Evaporator Fin

Thermistor

Evaporator fin thermistor/Min.:-
29.7°C (-21.46°F)
Max.: 59.55°C (139.19°F)

Actual evaporator
temperature is displayed

Open in circuit:
-29.7°C (-
21.46°F)
Short in circuit:
59.55°C
(139.19°F)

Solar Sensor (D

Side)

Driver side solar sensor/Min.: 0,
Max.: 255

Driver side solar sensor
voltage increases as
brightness increases

Open in circuit:
0
Short in circuit:
255

Solar Sensor (P

Passenger side solar sensor/Min.: Passenger side solar

Open in circuit:
0

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Side)

0, Max.: 255

sensor voltage increases
as brightness increases

Short in circuit:
255

Engine 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 engine is warrmed
up

Set Temperature (D

Side)

Driver side set temperature/Min.:
0, Max.: 255

Driver side actual set
temperature is displayed

Set Temperature (P

Side)

Passenger side set
temperature/Min.: 0, Max.: 255

Passenger side actual set
temperature is displayed

Blower Motor

Speed Level

Blower motor speed level/Min.: 0
level, Max.: 31 level

Increases in range
between 0 and 31 as
blower motor speed
increases

Adjusted Ambient

Temperature

Adjusted ambient
temperature/Min.: -30.8°C (-
23.44°F)
Max.: 50.8°C (123.44°F)

Adjusted ambient
temperature is displayed

Air Mix Servo Targ

Pulse (D)

Driver side air mix servo motor
target pulse/Min.: 5, Max.: 104

MAX. COLD: 5 (pulse)
MAX. HOT: 104 (pulse)

Air Mix Servo Targ

Pulse (P)

Passenger side air mix servo
motor target pulse/Min.: 6, Max.:
105

MAX. COLD: 105
(pulse)
MAX. HOT: 6 (pulse)

Air Outlet Servo

Pulse (D)

Driver side air outlet servo motor
target pulse/Min.: 9, Max.: 97

FACE: 9 (pulse)
B/L: 32 (pulse)
FOOT: 56 (pulse)
FOOT/DEF: 83 (pulse)
DEF: 97 (pulse)

Air Inlet Damper

Targ Pulse

Air inlet damper target
pulse/Min.: 7, Max.: 28

REC: 7
FRS: 28

Cool Air Bypass

Pulse

Cool air bypass servo motor
target pulse/Min.: 8, Max.: 50

Open: 8 (pulse)
Close: 50 (pulse)

Shin Set

Temperature

Shift set temperature/+2 C, +1 C,
Normal, -1 C, -2 C