Toyota Tundra. Manual — part 169

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

SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO JACK ADAPTER

DESCRIPTION

The stereo jack adapter sends an external device sound signal to the radio receiver through this circuit. The
sound signal that has been sent is amplified by the stereo component amplifier or radio receiver, and then is sent
to the speakers.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no
malfunction in the stereo component amplifier, radio receiver, or speakers.

WIRING DIAGRAM

Fig. 95: Sound Signal Circuit Between Radio Receiver And Stereo Jack Adapter - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO JACK ADAPTER)

a. Disconnect the K3 receiver connector.

b. Disconnect the J7 adapter 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

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 96: Identifying K3 And J7 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 )

MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT
AMPLIFIER

K3-17(ALI) - J7-1(ALO)

Always

Below 1 ohms

K3-15(ARI) - J7-2 (ARO)

K3-16(ASGN) - J7-3 (ASGN)

K3-18(AUXG) - J7-5 (AUXG)

K3-19(AUXI) - J7-4 (AUXO)

K3-17 (ALI) - Body ground

Always

10 kohms or higher

K3-15 (ARI) - Body ground

K3-16 (ASGN) - Body ground

K3-19 (AUXI) - Body ground

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

DESCRIPTION

This circuit sends a signal to the stereo component amplifier to mute noise. Because of that, the noise produced
by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source. If there
is a short in the circuit, even though the stereo component amplifier is normal, no sound, or only an extremely
small sound, can be produced.

WIRING DIAGRAM

Fig. 97: 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

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

Fig. 98: 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.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Result

RESULT

B: REPLACE RADIO RECEIVER (see REMOVAL )

C: REPLACE RADIO RECEIVER (see REMOVAL )

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