Toyota Tundra. Manual — part 582

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

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

Fig. 443: 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

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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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:



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



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



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

Fig. 444: Diagnostic Menu Screen Display - LAN Monitor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

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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

If the power source circuit is operating normally, proceed to the next step.

3. CHECK NAVIGATION RECEIVER

a. Disconnect the K18 and K8 receiver connectors.

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

Standard resistance

NAVIGATION RECEIVER TESTER CONNECTION SPECIFIED CONDITION

Component

Proceed to

Stereo component amplifier (440)

STEREO COMPONENT AMPLIFIER
POWER SOURCE CIRCUIT

Television display (1B0)*

TELEVISION DISPLAY POWER SOURCE
CIRCUIT *

HINT:
*: w/ Rear Seat Entertainment System

Tester Connection

Condition Specified Condition

K18-5 (ATX+) - K18-15 (ATX-)

Always

60 to 80 ohms

K8-9 (TXM+) - K8-10 (TXM-)*

HINT:
*: w/ Rear Seat Entertainment System

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Fig. 445: Identifying K18 And K8 Receiver Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Result

NAVIGATION RECEIVER RESULT CHART

B: REPLACE NAVIGATION RECEIVER (see REMOVAL (For Column Shift Type) )

C: REPLACE NAVIGATION RECEIVER (see REMOVAL (For Floor Shift Type) )

A: Go to Next Step

4. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - COMPONENT SHOWN

BY SUB-CODE)

HINT:



Start the check from the circuit that is near the component shown by the sub-code first.



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

navigation receiver and the component shown by the sub-code.

Result

Proceed to

OK

A

NG (for Column Shift Type)

B

NG (for Floor Shift Type)

C

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