Toyota Tundra. Manual — part 482

If the result is not as specified, the receiver may have a malfunction.

e. Using an oscilloscope, check the waveform.

Waveform (reference)

WAVEFORM REFERENCE

Fig. 73: Oscilloscope Waveform Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. CHECK STEREO COMPONENT AMPLIFIER (see TERMINALS OF ECU )

DTC CHECK / CLEAR

K18-20

(GND)

R - W-B

image signal

lever R position

(refer to
WAVEFORM)

K7-23 (V-) -

K18-20

(GND)

Shielded

- W-B

Shielded ground

Always

Below 1 V

K7-17

(MACC) -

K18-20

(GND)

LG - W-

B

Microphone

amplifier power

supply

Ignition switch ACC

4 to 6 V

K7-19 (MIC+)

- K18-20

(GND)

BR - W-

B

Microphone voice

signal

See "Microphone & Voice
Recognition Check" (see
NAVIGATION CHECK
MODE )

-

K7-20 (MIC-)

- K18-20

(GND)

Y - W-B

Microphone voice

signal

See "Microphone & Voice
Recognition Check" (see
NAVIGATION CHECK
MODE )

-

Item

Content

terminal No. (Symbols) K7-22 (V+) - K7-21 (CGND)

Tool Setting

0.2 V/DIV., 0.2 µs/DIV.

Condition

Ignition switch ON, shift lever R position

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HINT:



Illustrations may differ from the actual vehicle depending on the device settings and options. Therefore,
some detailed areas may not be exactly the same as on the actual vehicle.



If the system cannot enter the diagnostic mode, inspect all AVC-LAN communication components and
repair or replace problem parts (see AVC-LAN CIRCUIT ).



After the ignition switch is turned ON, check that the map is displayed before starting the diagnostic
mode. Otherwise, some items cannot be checked.

1. START DIAGNOSTIC MODE

a. Turn the ignition switch ACC.

b. Press the "DISP" switch.

Fig. 74: Identifying DISP Switch
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. From the display quality adjustment screen, touch the corners of the screen in the following order:

upper left --> lower left --> upper left --> lower left --> upper left --> lower left.

Fig. 75: Identifying Display Quality Adjustment Screen
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

d. The diagnostic mode starts and the "System Check Mode" screen will be displayed. Service

inspection starts automatically and the result will be displayed.

2. FINISH DIAGNOSTIC MODE

a. Turn the ignition switch OFF.

3. DIAGNOSIS MENU

a. The "Diagnosis MENU" screen will be displayed by pressing the "Menu" switch on the "System

Check Mode" screen.

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Fig. 76: Diagnostic Menu Screen Display - System Check Mode
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4. CHECK DTC

a. Read the system check result.

1. If the check result is "EXCH", "CHEK" or "Old", touch the displayed check result to view

the results on the "Unit Check Mode" screen and record them.

HINT:



If all check results are "OK", go to the communication DTC check.



If a device name is not known, its physical address is displayed.

HINT:

When proceeding to view the results of another device, press the "Service" switch to return to
the "System Check Mode" screen. Repeat this step.

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Fig. 77: Diagnostic Menu Screen Display - System Check Mode
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Read the communication diagnostic check result.

1. Return to the "System Check Mode" screen, and press the "LAN Mon" switch to enter the

"LAN Monitor" screen.

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