Toyota Tundra. Manual — part 2392
If the result is not as specified, the ECU may have a malfunction.
b. Using an oscilloscope, check waveform 1.
Compressor lock signal
WAVEFORM REFERENCE
J19-33 (TSD) -
J19-14 (GND)
P - W-B
Driver side solar sensor
signal
Ignition switch ON Solar
sensor subjected to
electric light
0.8 to 4.3 V
J19-32 (TSP) -
J19-14 (GND)
L - W-B
Passenger side solar
sensor signal
Ignition switch ON Solar
sensor subjected to
electric light
0.8 to 4.3 V
J19-29 (TR) -
J19-34 (SG-1)
G-B
Room temperature
sensor signal
Ignition switch ON Front
side interior temperature:
25°C (77°F)
1.8 to 2.2 V
J19-34 (SG-1) -
Body ground
B - Body
ground
Ground for room
temperature sensor
Always
Below 1 ohms
J19-13 (SG-2) -
Body ground
G - Body
ground
Ground for ambient
temperature sensor
Always
Below 1 ohms
J19-37 (LIN1) -
J19-14 (GND)
SB - W-B
LIN communication
signal
Ignition switch ON
Pulse generation
J19-11 (CANH)
- J19-14 (GND)
B - W-B
Hi-level CAN bus line
Ignition switch ON
Pulse generation
(see waveform 3
c)
J19-12 (CANL)
- J19-14 (GND)
W - W-B
Lo-level CAN bus line
Ignition switch ON
Pulse generation
(see waveform 4
d)
z1-2 (BUS G) -
Body ground
-
Ground for BUS IC
Always
Below 2 V
z1-3 (BUS) -
z1-2 (BUSG)
-
BUS IC control signal
Ignition switch OFF -->
ON
Pulse generation
z1-4 (BBUS) -
z1-2 (BUS G)
-
Power supply for BUS
IC
Always
11 to 14 V
z1-5 (SGA) -
Body ground
-
Ground for evaporator
temperature sensor
Always
Below 2 V
z1-6 (TEA) -
z1-5 (SGA)
-
A/C evaporator
temperature sensor
signal
Ignition switch ON
Evaporator temperature at
0°C (32°F)
1.7 to 2.1 V
z1-6 (TEA) -
z1-5 (SGA)
-
A/C evaporator
temperature sensor
signal
Ignition switch ON
Evaporator temperature at
15°C(59°F)
0.7 to 1.3 V
Terminal No. (Symbols)
Tool Setting
Condition
J19-8 (LOCK) - J19-14 (GND) 200 mV/DIV., 10 ms./DIV. Engine is running Blower switch LO
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
Fig. 19: Identifying Waveform 1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Using an oscilloscope, check waveform 2.
Blower motor control signal
WAVEFORM REFERENCE
Fig. 20: Identifying Waveform 2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
When the blower level is increased, the duty ratio changes accordingly.
d. Using an oscilloscope, check waveform 3.
CAN communication signal
WAVEFORM REFERENCE
A/C switch ON
Terminal No. (Symbols)
Tool Setting
Condition
J19-23 (BLW) - J19-14 (GND) 1 V/DIV., 500 µsec/DIV.
Ignition switch ON
Blower switch LO
Terminal No. (Symbols)
Tool Setting
Condition
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
Fig. 21: Identifying Waveform 3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
The waveform varies depending on the CAN communication signal.
e. Using an oscilloscope, check waveform 4.
CAN communication signal
WAVEFORM REFERENCE
Fig. 22: Identifying Waveform 4
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
The waveform varies depending on the CAN communication signal.
2. CHECK INTEGRATION CONTROL AND PANEL
J19-11 (CANH) - J19-14 (GND) 1 V/DIV., 10 µsec/DIV. Ignition switch ON
Terminal No. (Symbols)
Tool Setting
Condition
J19-12 (CANL) - J19-14 (GND) 1 V/DIV., 10 µsec./DIV. Ignition switch ON
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
Fig. 23: Identifying Terminals Of J37 Integration Control And Panel Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the J37 integration control and panel connector.
b. Measure the voltage and resistance according to the value(s) in the table below.
CONNECTOR TERMINALS REFERENCE
If the result is not as specified, there may be a malfunction on the wire harness side.
DTC CHECK/CLEAR
1. CHECK DTC
a. Connect the Techstream to the DLC3.
b. Turn the ignition switch ON.
c. Turn the Techstream on.
d. Enter the following menus: Body Electrical/Air conditioner/Trouble Codes.
e. Read the DTCs.
2. CLEAR DTC
a. Connect the Techstream to the DLC3.
b. Turn the ignition switch ON.
c. Turn the Techstream on.
d. Enter the following menus: Body Electrical/Air conditioner/Trouble Codes.
e. Erase the DTCs.
Terminal No.
(Symbols)
Wiring Color Terminal Description
Condition
Specified
Condition
J37-16 (IG+) - J37-1
(GND)
P - W-B
Ignition power supply
Ignition switch
ON
11 to 14 V
Ignition switch
OFF
Below 1 V
J37-1 (GND) - Body
ground
W-B - Body
ground
Ground
Always
Below 1 ohms
J37-3 (STX) - J37-1
(GND)
SB - W-B
LIN communication
signal
Ignition switch
ON
Pulse generation
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
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