Toyota Tundra. Manual — part 136

5. DIAGNOSTIC FUNCTION OUTLINE

a. The audio system has a diagnostic function (the result is indicated on the master unit).

b. A 3-digit hexadecimal component code (physical address) is allocated to each component on the

AVC-LAN. Using this code, the component in the diagnostic function can be displayed.

6. "BLUETOOTH" OUTLINE

a. "Bluetooth" is a trademark owned by Bluetooth SIG. Inc.

b. "Bluetooth" is a new wireless connection technology that uses the 2.4 GHz frequency band. This

makes it possible to connect a cellular phone ("Bluetooth" compatible phone*) to the radio receiver
(the "Bluetooth" system is built-in) through the handsfree function of the cellular phone, even if it
is in a pocket or bag. As a result, it is not necessary to directly connect the radio receiver to the
cellular phone.

HINT:



*: Some versions of "Bluetooth" compatible cellular phones may not function.



The communication performance of "Bluetooth" may vary depending on obstructions or
radio wave conditions between communication devices, electromagnetic radiation,
communication device sensitivity, or antenna capacity.

Fig. 11: Bluetooth Outline - System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:

Use these procedures to troubleshoot the audio and visual system.

1. VEHICLE BROUGHT TO WORKSHOP

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

2. INSPECT BATTERY VOLTAGE

Standard voltage: 11 to 14 V

If the voltage is below 11V, recharge or replace the battery before proceeding.

3. BASIC INSPECTION

a. Turn the ignition switch ON.

b. Check whether or not the radio receiver turns on.

Result:

RESULT REFERENCE

B: Go to step 6

A: Go to Next Step

4. CHECK FOR DTC

a. Check for DTCs and note any codes that are output (see DTC CHECK / CLEAR ).

HINT:



If the system cannot enter the diagnostic mode, inspect the AVC-LAN and all the
components that connect to the AVC-LAN for short circuits and repair or replace the
problem part.



Even if the malfunction symptom is not confirmed, check the DTCs. This is because the
system stores past DTCs.

b. Delete the DTCs.

c. Recheck for DTCs by simulating the operation indicated by the DTCs.

Result:

RESULT REFERENCE

B: Go to step 6

A: Go to Next Step

Result

Proceed to

Radio receiver turns on

A

Radio receiver does not turn on

B

Result

Proceed to

DTC is output again

A

DTC is not output

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

5. DIAGNOSTIC TROUBLE CODE CHART

a. Find the output code in the DIAGNOSTIC TROUBLE CODE CHART (see DIAGNOSTIC

TROUBLE CODE CHART ).

NEXT: Go to step 8

6. PROBLEM SYMPTOMS TABLE

a. Refer to the PROBLEM SYMPTOMS TABLE .

Result:

RESULT REFERENCE

B: Go to step 8

A: Go to Next Step

7. OVERALL ANALYSIS AND TROUBLESHOOTING

a. Terminals of ECU (see TERMINALS OF ECU ).

8. ADJUST, REPAIR OR REPLACE

9. CONFIRMATION TEST

NEXT: END

IDENTIFICATION OF NOISE SOURCE

1. Radio Description

a. Radio frequency band

1. Radio broadcasts use the radio frequency bands shown in the table below.

Result

Proceed to

Fault is not listed in PROBLEM SYMPTOMS TABLE

A

Fault is listed in PROBLEM SYMPTOMS TABLE

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

Fig. 12: Radio Frequency Bands Reference Table
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Service area

1. The service areas of AM and FM broadcasts are vastly different. Sometimes an AM

broadcast can be received very clearly but an FM stereo cannot. FM stereo has the smallest
service area, and is prone to pick up static and other types of interference such as noise.

c. Radio reception problems

HINT:

In addition to static, other problems such as "phasing", "multipath", and "fade out" exist. These
problems are not caused by electrical noise, but by the radio signal propagation method itself.

Fig. 13: Identifying Service Areas Of AM And FM Broadcasts
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Phasing

AM broadcasts are susceptible to electrical interference and another kind of interference
called phasing. Occurring only at night, phasing is the interference created when a vehicle
receives 2 radio wave signals from the same transmitter. One signal is reflected off the
ionosphere and the other signal is received directly from the transmitter.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra