Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Be sure to read Description before performing the following procedures.

CHECK NAVIGATION RECEIVER ASSEMBLY POWER SOURCE CIRCUIT
1. Refer to the navigation receiver assembly power source circuit (See NAVIGATION RECEIVER ASSEMBLY POWER SOURCE CIRCUIT ).
  If the power source circuit is operating normally, proceed to the next step.

INSPECT NAVIGATION RECEIVER ASSEMBLY

Disconnect the I20 and I8* navigation receiver assembly connectors.
HINT:

*: w/ Rear Seat Entertainment System

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

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
I20-5 (ATX+) - I20-15 (ATX-)	Always	60 to 80 Ω
I8-9 (TXM+) - I8-10 (TXM-)*	Always	60 to 80 Ω
HINT: *: w/ Rear Seat Entertainment System

Reconnect the navigation receiver assembly connectors.

NG: REPLACE NAVIGATION RECEIVER ASSEMBLY (See REMOVAL )

Fig 1: Identifying I20 And I8 Navigation Receiver Assembly Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

IDENTIFY COMPONENT WHICH HAS STORED THIS CODE

Enter the diagnostic mode.
Press the "LAN Mon" switch to change to "LAN Monitor" mode.

Identify the component which has stored this code.

Component Table

COMPONENT REFERENCE

Display	Component
DSP-AMP	Stereo component amplifier assembly
Rr-TV*	Television display assembly
HINT: "DSP-AMP" is the component which has stored this code in the example shown in the illustration. *: w/ Rear Seat Entertainment System

Fig 2: Identifying LAN Monitor Mode

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - COMPONENT WHICH HAS STORED THIS CODE)
HINT:

For details of the connectors, refer to "Terminals of ECU" (See TERMINALS OF ECU ).
1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the navigation receiver assembly and the component which has stored this code.
  1. Disconnect all connectors between the navigation receiver assembly and the component which has stored this code.
  2. Check for an open or short in the AVC-LAN circuit between the navigation receiver assembly and the component which has stored this code.
    OK: There is no open or short circuit.
    
    Fig 3: AVC-LAN Wiring Diagram - w/o Rear Seat Entertainment System
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 4: AVC-LAN Wiring Diagram - w/ Rear Seat Entertainment System
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step
REPLACE NAVIGATION RECEIVER ASSEMBLY
1. Replace the navigation receiver assembly with a normal one (See REMOVAL ).
2. Check if the same problem occurs again.
  OK: Same problem does not occur.
NG: END

OK: REPLACE COMPONENT WHICH HAS STORED THIS CODE