Toyota Tundra. Manual — part 569

If there is an open in the circuit, the navigation system cannot be operated using the steering pad switch. If there
is a short in the circuit, the resulting condition is the same as if the switch were continuously depressed.
Therefore, the navigation system cannot be operated using the steering pad switch, and the navigation system
itself cannot function.

WIRING DIAGRAM

Fig. 393: Steering Pad Switch Circuit - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - SPIRAL CABLE)

a. Disconnect the K21 receiver connector.

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 PRECAUTION in the
Supplemental Restraint System (see PRECAUTION ).

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

b. Disconnect the J45 cable connector.

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

Standard resistance

HARNESS AND CONNECTOR (NAVIGATION RECEIVER - SPIRAL CABLE) TESTER
CONNECTION SPECIFIED CONDITION

Fig. 394: Identifying K21 Receiver Connector And J45 Cable Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

2. INSPECT SPIRAL CABLE

a. Disconnect the z3 and J45 cable connectors.

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

Tester Connection

Condition Specified Condition

K21-8 (SW2) - J45-5 (AU2)

Always

Below 1 ohms

K21-6 (SWG) - J45-4 (EAU)

K21-7 (SW1) - J45-6 (AU1)

K21-8 (SW2) - Body ground

Always

10 kohms or higher

K21-6 (SWG) - Body ground

K21-7 (SW1) - Body ground

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

Standard resistance

SPIRAL CABLE TESTER CONNECTION SPECIFIED CONDITION

Fig. 395: Identifying z3 And J45 Cable Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Tester Connection

Condition

Specified

Condition

J45-4 (EAU) - z3-8

(EAU)

Spiral cable is turned 2.5 rotations

counterclockwise

Below 1 ohms

Spiral cable is centered

Spiral cable is turned 2.5 rotations clockwise

J45-5 (AU2) - z3-9 (AU2)

Spiral cable is turned 2.5 rotations

counterclockwise

Spiral cable is centered

Spiral cable is turned 2.5 rotations clockwise

J45-6 (AU1) - z3-10

(AU1)

Spiral cable is turned 2.5 rotations

counterclockwise

Spiral cable is centered

Spiral cable is turned 2.5 rotations clockwise

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY (See REMOVAL )

OK: Go to Next Step

3. INSPECT STEERING PAD SWITCH ASSEMBLY

Fig. 396: Identifying Steering Pad Switch Assembly
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the z3 switch connector.

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

Standard resistance

STEERING PAD SWITCH ASSEMBLY TESTER CONNECTION SPECIFIED
CONDITION

CAUTION: The spiral cable is an important part of the SRS airbag system.

Incorrect removal or installation of the spiral cable may prevent
the airbag from deploying. Be sure to read the PRECAUTION for
the supplemental restraint system (see PRECAUTION ).

Tester Connection

Switch Condition

Specified Condition

9 (AU2) - 8 (EAU)

No switch is pushed

100 kohms or higher

MODE switch pushed

Below 1 ohms

On Hook switch pushed

329 ohms

Off Hook switch pushed

1000 ohms

Voice switch is pushed

3110 ohms

10 (AU1) - 8 (EAU)

No switch is pushed

100 kohms or higher

Seek+ switch pushed

Below 1 ohms

Seek- switch pushed

329 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra