Toyota Tundra. Manual — part 171

OK: Go to Next Step

2. INSPECT STEREO COMPONENT AMPLIFIER

a. Disconnect the K15 amplifier connector.

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.

Fig. 103: Identifying Stereo Component Amplifier Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4. Measure the voltage between terminal SPD of the stereo component amplifier and body

ground when the drive wheels are turned slowly.

OK: Voltage pulses as shown in the illustration.

NG: Go to step 3

Fig. 104: Voltage Pulses For SPD
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

OK: REPLACE STEREO COMPONENT AMPLIFIER (see REMOVAL )

3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - STEREO COMPONENT

AMPLIFIER)

a. Disconnect the K15 amplifier connector.

b. Disconnect the J28 meter connector.

c. Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

HINT:

If the resistance between terminal SPD and body ground is less than 10 kohms, there may be a
short in a wire harness, connector, or an ECU that is connected to the SPD signal wire.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 105: Identifying J28 And K15 Connectors Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Tester Connection

Switch Condition Specified Condition

K15-11(SPD) - J28-35 (+S)

Ignition switch OFF

Below 1 ohms

K15-11 (SPD) - Body ground

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

OK: REPLACE COMBINATION METER (See REMOVAL )

CELLULAR PHONE VOICE CIRCUIT BETWEEN RADIO RECEIVER AND STEREO
COMPONENT AMPLIFIER

SYSTEM DESCRIPTION

This circuit is used when the cellular phone voice in the "Bluetooth" handsfree system is on.

WIRING DIAGRAM

Fig. 106: Cellular Phone Voice Circuit Between Radio Receiver And Stereo Component Amplifier -
Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT

AMPLIFIER)

a. Disconnect the K3 receiver connector.

b. Disconnect the K15 amplifier connector.

c. Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Condition Specified Condition

K3-11(IVO+) - K15-23 (II+)

Always

Below 1 ohms

K3-12(IVO-) - K15-22 (II-)

K3-11 (IVO+) - Body ground

Always

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 107: Identifying K3 And K15 Connectors Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

MICROPHONE CIRCUIT BETWEEN MICROPHONE AND RADIO RECEIVER

DESCRIPTION

This circuit sends a microphone signal from the microphone to the radio receiver.

It also supplies power from the radio receiver to the microphone.

WIRING DIAGRAM

K3-12(IVO-) - Body ground

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra