Toyota Tundra. Manual — part 159

TESTER CONNECTION SPECIFIED CONDITION

for Built-in Type Amplifier System

TESTER CONNECTION SPECIFIED CONDITION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connection

Switch Condition Specified Condition

K9-4 (SPD) - J28-35 (+S)

Ignition switch OFF

Below 1 ohms

K9-4 (SPD) - Body ground

10 kohms or higher

Tester Connection

Switch Condition Specified Condition

K3-3 (SPD) - J28-35 (+S)

Ignition switch OFF

Below 1 ohms

K3-3 (SPD) - Body ground

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

Fig. 60: Checking Harness And Connector (Combination Meter - Radio Receiver)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: REPLACE COMBINATION METER (See REMOVAL )

STEERING PAD SWITCH CIRCUIT

DESCRIPTION

This circuit sends an operation signal from the steering pad switch to the radio receiver. If there is an open in
the circuit, the audio system cannot be operated using the steering pad switch. If there is a short in the circuit,

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

the same condition as when the switch is continuously depressed occurs. Therefore, the radio receiver cannot be
operated using the steering pad switch, and also the radio receiver itself cannot function.

WIRING DIAGRAM

Fig. 61: Steering Pad Switch - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. INSPECT RADIO RECEIVER

a. Disconnect the K3 receiver connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

CAUTION: The vehicle is equipped with an SRS (Supplemental Restraint System)

which includes components such as airbags. Before servicing (including
removal or installation of parts), be sure to read the precautionary notice
for the SRS (see PRECAUTION ).

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

NG: Go to step 2

Fig. 62: Identifying K3 Receiver Connector 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 )

2. INSPECT STEERING PAD SWITCH ASSEMBLY

a. Disconnect the z3 switch connector.

b. Measure the resistance according to the values in the table below.

Tester Connection

Switch Condition

Specified Condition

K3-7(SW1) - K3-6 (SWG)

No switch is pushed 100 kohms or higher

Seek+ switch: push

Below 1 ohms

Seek- switch: push

329 ohms

Volume* switch: push

1000 ohms

Volume- switch: push

3100 ohms

K3-8 (SW2) - K3-6 (SWG)

No switch is pushed 100 kohms or higher

MODE switch: push

Below 1 ohms

On Hook switch: push

329 ohms

Off Hook switch: push

1000 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra