Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus GX 470. 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 MULTI-DISPLAY POWER SOURCE CIRCUIT
1. Refer to MULTI-DISPLAY POWER SOURCE CIRCUIT .
  If the power source circuit is operating normally, proceed to the next step.

INSPECT RADIO RECEIVER

Fig 1: Identifying Radio Receiver Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the R1, R2 and R3 receiver connectors.
Measure the resistance according to the value(s) in the table below.

Standard resistance

RADIO RECEIVER RESISTANCE

Tester Connection	Condition	Specified Condition
R3-9 (TXM+) - R3-10 (TXM-)	Always	60 to 80 Ω
R1-5 (ATX+) - R1-15 (ATX-)	Always	60 to 80 Ω
R2-9 (TX+) - R2-10 (TX-)	Always	60 to 80 Ω

NG: REPLACE RADIO RECEIVER ASSEMBLY

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 WHICH HAS STORED THIS CODE

Display	Component
AUDIO H/U	Radio receiver
DSP-AMP	Stereo component amplifier
NAVI	Navigation ECU
Rr-TV	Television display
DVD-CH	Disc player changer
CAMERA	Television camera ECU
G/W	Gateway ECU

Fig 2: Identifying Tester Display - LAN Monitor

HINT:

"NAVI" is the component which has stored this code.

CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - COMPONENT WHICH HAS STORED THIS CODE)
HINT:

For details of the connectors, refer to TERMINALS OF ECU .
1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the multi-display and the component which has stored this code.
  1. Disconnect all connectors between the multi-display and the component which has stored this code.
  2. Check for an open or short in the AVC-LAN circuit between the multi-display and the component which has stored this code.
    OK: There is no open or short circuit.
    
    Fig 3: Identifying AVC-LAN Wiring Diagram
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
    
    OK: Go to Next Step
CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - RADIO RECEIVER)
HINT:

For details of the connectors, refer to TERMINALS OF ECU .
1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the multi-display and the radio receiver.
  
  Fig 4: Identifying AVC-LAN Wiring Diagram
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Disconnect all connectors between the multi-display and the radio receiver.
  2. Check for an open or short in the AVC-LAN circuit between the multi-display and the radio receiver.
    OK: There is no open or short circuit.
    
    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
    
    OK: Go to Next Step
REPLACE MULTI-DISPLAY
1. Replace the multi-display with a normal one and check if the same problem occurs again.
  OK: Same problem does not occur.
  
  NG: REPLACE COMPONENT WHICH HAS STORED THIS CODE
  
  OK: END