Toyota Tundra. Manual — part 570

NG: REPLACE STEERING PAD SWITCH ASSEMBLY (See REMOVAL )

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

ILLUMINATION CIRCUIT

DESCRIPTION

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

WIRING DIAGRAM

Volume+ switch is pushed

1000 ohms

Volume- switch is pushed

3110 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

Fig. 397: Illumination Circuit - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK ILLUMINATION

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

parts (seat heater switch, room light switch, etc.) come on when the light control switch is turned to
the HEAD or TAIL position.

Result

ILLUMINATION RESULT CHART

B: Go to step 5

C: Go TO LIGHTING SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )

D: Go to step 6

A: Go to Next Step

2. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - NAVIGATION RECEIVER AND

BATTERY)

a. Disconnect the J45 cable connector.

b. Disconnect the K21 receiver connector.

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

Standard resistance

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

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 ).

Result

Proceed

to

Illumination comes on for all components except steering pad switch.

A

Illumination comes on for all components except navigation receiver.

B

No illumination (navigation receiver, glove box light, room light switch, etc.) comes
on.

C

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

D

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

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

Standard voltage

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

Fig. 398: Identifying J45 Cable Connector And K21 Receiver Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

3. INSPECT STEERING PAD SWITCH ASSEMBLY

Tester Connection

Condition Specified Condition

J45-4 (EAU) - K21-6 (SW6) Always

Below 1 ohms

J45-4 (EAU) - Body ground

Always

10 kohms or higher

Tester Connection

Switch Condition

Specified Condition

J45-12 (IL+2) -Body ground

Light control switch OFF

Below 1 V

Light control switch TAIL or HEAD

11 to 14 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

Fig. 399: Inspecting Steering Pad Switch Assembly
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the z3 switch connector.

b. Connect the positive (+) lead to terminal 5 (IL+2) and the negative (-) lead to terminal 8 (EAU) of

the steering pad switch connector.

c. Check if the illumination for the steering pad switch comes on.

OK: Illumination for the steering pad switch comes on.

NG: REPLACE STEERING PAD SWITCH ASSEMBLY (See REMOVAL )

OK: Go to Next Step

4. INSPECT SPIRAL CABLE

a. Disconnect the z3 and J45 cable connectors.

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

Standard resistance

SPIRAL CABLE TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Condition

Specified

Condition

z3-5 (IL+2) - J45-12

(IL+2)

Spiral cable is turned 2.5 rotations

counterclockwise

Below 1 ohms

Spiral cable is centered

Spiral cable is turned 2.5 rotations clockwise

Z3-8 (EAU) - J45-4

Spiral cable is turned 2.5 rotations

counterclockwise

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra