Toyota Tundra. Manual — part 203

OK: Cellular phone has reception.

Result:

RESULT REFERENCE

B: REPLACE RADIO RECEIVER (see REMOVAL )

C: REPLACE RADIO RECEIVER (see REMOVAL )

A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(see PROBLEM SYMPTOMS TABLE )

THE OTHER CALLER'S VOICE CANNOT BE HEARD, IS TOO QUIET, OR DISTORTED

INSPECTION PROCEDURE

1. CHECK CELLULAR PHONE

a. Check if the voice on the other side can be heard using a cellular phone.

OK: Voice can be heard.

NG: REPAIR OR REPLACE CELLULAR PHONE

OK: Go to next step.

2. CHECK AUDIO AND VISUAL SYSTEM

a. Check that audio sound can be heard from the driver side speaker.

OK: Audio sound can be heard.

HINT:

If audio sound cannot be heard, proceed to "No sound can be heard from speakers. (Audio is
mute.)" in the PROBLEM SYMPTOMS TABLE (see PROBLEM SYMPTOMS TABLE ).

NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE (see PROBLEM SYMPTOMS TABLE )

OK: Go to next step.

3. CHECK SETTINGS

Result

Proceed to

OK

A

NG (for Column Shift Type)

B

NG (for Floor Shift Type)

C

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

a. Check that the received voice level setting on the cellular phone is not too low.

OK: The received voice level setting is not too low.

NG: SET VOLUME TO HIGH

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE (see PROBLEM SYMPTOMS TABLE )

THE OTHER CALLER CANNOT HEAR YOUR VOICE, OR YOUR VOICE IS TOO QUIET OR
DISTORTED

INSPECTION PROCEDURE

1. CHECK CELLULAR PHONE

a. Check if the other side can hear your voice properly.

OK: Your voice can be heard correctly.

NG: REPAIR OR REPLACE CELLULAR PHONE

OK: Go to next step.

2. CHECK SETTINGS

a. Check if mute is set to ON.

OK: Mute is not set to ON.

NG: TURN MUTE OFF

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE (see PROBLEM SYMPTOMS TABLE )

VEHICLE SPEED SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND COMBINATION
METER

DESCRIPTION

This circuit is necessary for the ASL (Auto Sound Leveliser) built into the radio receiver.

Speed signals are received from the combination meter and used for the ASL.

The ASL function automatically adjusts the sound data in order to enable the driver to hear clear audio sound
even when vehicle noise increases (as vehicle noise increases, the volume is turned up, etc.).

HINT:

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra



A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is
changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective
system based on the pulse signal.



If a short occurs in an ECU, all systems in the diagram below will not operate normally.

WIRING DIAGRAM

Fig. 182: Vehicle Speed Signal Circuit Between Radio Receiver And Combination Meter - Wiring
Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK OPERATION OF SPEEDOMETER

a. Drive the vehicle and check if the function of the speedometer on the combination meter is normal.

OK: Actual vehicle speed and the speed indicated on the speedometer are the same.

HINT:



The speed indicated on the speedometer has an allowable margin of error. This can be tested
using a speedometer tester (calibrated chassis dynamometer). For details about testing and

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

the margin of error, refer to "OPERATION CHECK" in the meter/gauge system (see
OPERATION CHECK ).



The vehicle speed sensor is functioning normally when the indication on the speedometer is
normal.

NG: Go TO METER / GAUGE SYSTEM (See OPERATION CHECK )

OK: Go to next step.

2. INSPECT RADIO RECEIVER

a. Disconnect the K3*1 or K9*2 receiver connector.

HINT:



*1: for Built-in Type Amplifier System



*2: for Separate Type Amplifier System

b. Measure the voltage.

1. Jack up the drive wheels.

2. Move the shift lever to the neutral position.

3. Turn the ignition switch to the ON position.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra