Toyota Tundra. Manual — part 521

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For details of the connectors, refer to "TERMINALS OF ECU" .

a. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the stereo

component amplifier and the component shown by the sub-code.

1. Disconnect all connectors between the stereo component amplifier and the component shown

by sub-code.

2. Check for an open or short in the AVC-LAN circuit between the stereo component amplifier

and the component shown by the sub-code.

OK: There is no open or short circuit.

Fig. 210: AVC-LAN Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

5. REPLACE COMPONENT SHOWN BY SUB-CODE

a. Replace the component shown by the sub-code with a normal one and check if the same problem

occurs again.

OK: Same problem does not occur.

NG: REPLACE STEREO COMPONENT AMPLIFIER (See REMOVAL )

OK: END

NAVIGATION RECEIVER ASSEMBLY POWER SOURCE CIRCUIT

DESCRIPTION

The circuit provides power to the navigation receiver.

WIRING DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

Fig. 211: Navigation Receiver Assembly Power Source Circuit - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. INSPECT FUSE (RAD NO. 1, ACC)

a. Disconnect the ACC fuse from the main body ECU.

b. Disconnect the RAD NO. 1 fuse from the engine room junction block.

c. Measure the resistance of the fuses.

Standard resistance

FUSE (RAD NO. 1, ACC) TESTER CONNECTION SPECIFIED CONDITION

NG: REPLACE FUSE

OK: Go to Next Step

2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY

GROUND)

a. Disconnect the K18 receiver connector.

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

Standard resistance

Tester Connection Condition Specified Condition

RAD NO. 1 fuse

Always

Below 1 ohms

ACC fuse

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2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra

HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY
GROUND) TESTER CONNECTION SPECIFIED CONDITION RESISTANCE

Fig. 212: Identifying K18 Receiver Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard voltage

HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY
GROUND) TESTER CONNECTION SPECIFIED CONDITION VOLTAGE

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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

NAVIGATION RECEIVER ASSEMBLY COMMUNICATION ERROR

INSPECTION PROCEDURE

1. IDENTIFY COMPONENT SHOWN BY SUB-CODE

a. Enter the diagnostic mode.

b. Press the "LAN Mon" switch to change to "LAN Monitor" mode.

c. Identify the component shown by the sub-code.

HINT:

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"140 (navigation receiver)" is the component shown by the sub-code in the example shown in
the illustration.

Tester Connection

Condition Specified Condition

K18-20 (GND) -Body ground Always

Below 1 ohms

Tester Connection

Switch Condition Specified Condition

K18-1 (B)-Body ground

Always

11 to 14 V

K18-11 (ACC)-Body ground Ignition switch ACC

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The sub-code will be indicated by its physical address.

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For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION" .

Fig. 213: Display - System Check Mode
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

a. Inspect the power source circuit of the component shown by the sub-code.

Component table

POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE COMPONENT
CHART

Component

Proceed to

Stereo component amplifier (440)

STEREO COMPONENT AMPLIFIER

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Navigation - Tundra