Toyota Tundra. Manual — part 215

Fig. 224: Mute Signal Circuit Between Radio Receiver And Stereo Component Amplifier - Wiring
Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. INSPECT STEREO COMPONENT AMPLIFIER

a. Disconnect the K15 amplifier connector.

b. Measure the voltage according to the value(s) in the table below.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

NG: Go to step 2

Fig. 225: Identifying K15 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: REPLACE STEREO COMPONENT AMPLIFIER (see REMOVAL )

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

AMPLIFIER)

a. Disconnect the K4 receiver connector.

b. Disconnect the K15 amplifier connector.

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

Tester Connection

Switch Condition

Specified Condition

K15-1 (MUTE) - Body

ground

Ignition switch ACC, Audio system is playing -->

Changing modes

Above 3.5 V -->

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Result

RESULT

B: REPLACE RADIO RECEIVER (see REMOVAL )

C: REPLACE RADIO RECEIVER (see REMOVAL )

Fig. 226: Identifying K4 And K15 Connectors Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Tester Connection

Condition Specified Condition

K4-7 (MUTE) - K15-1 (MUTE) Always

Below 1 ohms

K4-7 (MUTE) - Body ground

Always

10 kohms or higher

Result

Proceed to

NG

A

OK (for Column Shift Type)

B

OK (for Floor Shift Type)

C

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

A: REPAIR OR REPLACE HARNESS OR CONNECTOR

AVC-LAN CIRCUIT

DESCRIPTION

Each unit of the audio system connected to the AVC-LAN (communication bus) transfers the signal of each
switch by communication.

When a short to +B or short to ground occurs in this AVC-LAN, the audio system will not function normally as
the communication is discontinued.

INSPECTION PROCEDURE

1. INSPECT RADIO RECEIVER

a. Disconnect the K4 and K22* receiver connectors.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Result:

RESULT REFERENCE

B: REPLACE RADIO RECEIVER (see REMOVAL )

C: REPLACE RADIO RECEIVER (see REMOVAL )

Tester Connection

Condition Specified Condition

K4-5 (ATX+) - K4-15 (ATX-)

Always

60 to 80 ohms

K22-9 (TXM+) - K22-10 (TXM-)* Always

60 to 80 ohms

HINT:
*: w/ Rear Seat Entertainment System

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

Fig. 227: Identifying K4 And K22 Connectors Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

A: Go to next step.

2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMPONENT WHICH HAS

STORED THIS CODE)

Fig. 228: AVC-LAN Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra