Toyota Tundra. Manual — part 761
B: Go to step 6
A: Go to Next Step
5. OVERALL ANALYSIS AND TROUBLESHOOTING*
a. See TERMINALS OF ECU
b. See DATA LIST / ACTIVE TEST
c. See OPERATION CHECK
6. REPAIR OR REPLACE
7. CONFIRMATION TEST
NEXT: END
OPERATION CHECK
1. CHECK WINDOW DEFOGGER OPERATION
a. Turn the ignition switch ON.
b. Check that pressing the defogger switch illuminates the indicator and warms the rear window
surface.
c. Check that after approximately 15 minutes, the indicator light turns off and the window defogger
deactivates.
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking
the suspected areas in the order they are listed. Replace parts as necessary.
Window defogger system
WINDOW DEFOGGER PROBLEM SYMPTOM CHART
Fault is not listed in problem symptoms table
A
Fault is listed in problem symptoms table
B
Symptom
Suspected Area
See
Rear window defogger system
does not operate
DEFOGH-fuse
REAR WINDOW DEFOGGER
SYSTEM DOES NOT
OPERATE
DEFOG relay
-
Integration control and panel
-
Air conditioning amplifier
-
LIN communication line
-
2009 Toyota Tundra
2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra
TERMINALS OF ECU
1. CHECK AIR CONDITIONING AMPLIFIER
Fig. 192: Identifying J19 And z1 Air Conditioning Amplifier Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the J19 air conditioning amplifier connector.
b. Measure the resistance and voltage according to the value(s) in the table below.
AIR CONDITIONING AMPLIFIER RESISTANCE AND VOLTAGE
If the result is not as specified, there may be a malfunction on the wire harness side.
c. Reconnect the J19 air conditioning amplifier connector.
d. Measure the voltage according to the value(s) in the table below.
AIR CONDITIONING AMPLIFIER VOLTAGE
Harness and connector
-
Terminal No.
(Symbols)
Wiring Color Terminal Description
Condition
Specified
Condition
J19-1 (IG+) - J19-14
(GND)
P-W-B
Ignition power supply
Ignition switch
ON
11 to 14 V
Ignition switch
OFF
Below 1 V
J19-21 (B) - J19-14
(GND)
R-W-B
Battery power source Always
11 to 14 V
J19-37 (LIN1) - J19-14
(GND)
SB - W-B
LIN communication
signal
Ignition switch
ON
Pulse generation
J19-14 (GND) - Body
ground
W-B - Body
ground
Ground
Always
Below 1 ohms
Terminal No.
(Symbols)
Wiring
Color
Terminal
Description
Condition
Specified
Condition
J19-38 (RDEF) - J19-
14 (GND)
R-W-B
Defogger relay
Ignition switch ON
Defogger switch OFF
11 to 14 V
Ignition switch ON
2009 Toyota Tundra
2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra
If the result is not as specified, the air conditioning amplifier or fuse may have a malfunction.
2. CHECK INTEGRATION CONTROL AND PANEL
Fig. 193: Identifying J37 Integration Control And Panel Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the J37 integration control and panel connector.
b. Measure the resistance and voltage according to the value(s) in the table below.
INTEGRATION CONTROL AND PANEL RESISTANCE AND VOLTAGE
If the result is not as specified, there may be a malfunction on the wire harness side.
DATA LIST / ACTIVE TEST
1. ACTIVE TEST
HINT:
Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because
intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests
early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while
performing Active Tests.
Defogger switch ON
Below 1 V
Terminal No.
(Symbols)
Wiring Color Terminal Description
Condition
Specified
Condition
J37-16 (IG+) - J37-1
(GND)
P-W-B
Ignition power supply
Ignition switch
OFF
Below 1 V
Ignition switch
ON
11 to 14 V
J37-3 (STX) - J37-1
(GND)
SB - W-B
LIN communication
circuit
Ignition switch
ON
Pulse generation
J37-1 (GND) - Body
ground
W-B - Body
ground
Ground
Always
Below 1 ohms
2009 Toyota Tundra
2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra
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 / Active Test.
e. According to the display on the Techstream, perform the "Active Test".
Air Conditioner
AIR CONDITIONER TECHSTREAM TESTER DISPLAY REFERENCE CHART
REAR WINDOW DEFOGGER SYSTEM DOES NOT OPERATE
DESCRIPTION
When the rear window defogger switch is turned ON, a rear window defogger activation request signal is sent
via the LIN communication line to the air conditioning amplifier. Then the air conditioning amplifier operates
the rear window defogger.
WIRING DIAGRAM
Fig. 194: Rear Window Defogger System Does Not Operate Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Tester Display
Test Part
Control Range Diagnostic Note
Defogger Relay (Rear) Rear window defogger relay operation
OFF or ON
-
2009 Toyota Tundra
2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra
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