Toyota Tundra. Manual — part 160

Fig. 63: Inspecting Steering Pad Switch Assembly
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

NG: REPLACE STEERING PAD SWITCH ASSEMBLY (see REMOVAL )

OK: Go to Next Step

3. INSPECT SPIRAL CABLE

a. Disconnect the z3 switch connector.

b. Disconnect the J45 cable connector.

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

Standard resistance

Tester Connection

Switch Condition

Specified Condition

z3-10(AU1) - z3-8(EAU)

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

3110 ohms

z3-9 (AU2) - z3-8 (EAU)

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

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Condition

Specified

Condition

Z3-8 (EAU) - J45-4

(EAU)

Spiral cable is turned 2.5 rotations

counterclockwise

Below 1 ohms

Spiral cable is centered

Spiral cable is turned 2.5 rotations clockwise

z3-10(AU1) - J45-6

(AU1)

Spiral cable is turned 2.5 rotations

counterclockwise

Spiral cable is centered

Spiral cable is turned 2.5 rotations clockwise

Z3-9 (AU2) - J45-5

(AU2)

Spiral cable is turned 2.5 rotations

counterclockwise

Spiral cable is centered

Spiral cable is turned 2.5 rotations clockwise

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 SRS (see PRECAUTION ).

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

Fig. 64: Identifying z3 And J45 Connectors Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE SPIRAL CABLE (See REMOVAL )

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO
RECEIVER)

ILLUMINATION CIRCUIT

DESCRIPTION

Power is supplied to the radio receiver and steering pad switch illumination when the light control switch is in
the TAIL or HEAD position.

WIRING DIAGRAM

Fig. 65: Illumination - Wiring Diagram

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK ILLUMINATION

a. Check if the illumination for the radio receiver, steering pad switch, glove box or other parts

(hazard switch, transmission control switch, etc.) come on when the light control switch is turned to
the HEAD or TAIL position.

Result:

RESULT REFERENCE

B: Go to step 6

C: Go TO LIGHTING SYSTEM (See ILLUMINATION CIRCUIT )

D: Go to step 7

A: Go to Next Step

2. CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE)

a. Disconnect the J45 cable connector.

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

Standard voltage

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 ).

Result

Proceed

to

Illumination comes on for all components except steering pad switch.*

A

Illumination comes on for all components except radio receiver.

B

No illumination comes on (radio receiver, hazard switch, glove box, etc.).

C

Illumination comes on for all components except steering pad switch* and radio
receiver.

D

HINT:
*: For built-in type amplifier systems, there is no steering pad switch.

Tester Connection

Switch Condition

Specified Condition

J45-12(IL+2) - Body ground Light control switch TAIL or HEAD

11 to 14 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Audio/Visual - Tundra