Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

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

CHECK DISPLAY AND NAVIGATION ASSEMBLY POWER SOURCE CIRCUIT
1. Refer to the DISPLAY AND NAVIGATION ASSEMBLY POWER SOURCE CIRCUIT
  If the power source circuit is operating normally, proceed to the next step.

INSPECT RADIO RECEIVER ASSEMBLY

Fig 1: Identifying L51, L52 And L53 Radio Receiver Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the L51, L52 and L53 receiver connectors.

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
L53-9 (TXM+) - L53-10 (TXM-)	Always	60 to 80 Ω
L51-5 (ATX+) - L51-15 (ATX-)
L52-9 (TX+) - L52-10 (TX-)

NG: REPLACE RADIO RECEIVER ASSEMBLY (See REMOVAL )

OK: Go to next step

IDENTIFY COMPONENT WHICH HAS STORED THIS CODE

Fig 2: Display - LAN Monitor Screen

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 CHART

Display	Component
AUDIO	Radio receiver
DSP-AMP	Stereo component amplifier
CLOCK	Clock
RSE	Television display
DVD-P	Disc player
CAMERA-C	Parking assist ECU
Rr-CONT	Rear power seat module switch
XM	Satellite radio tuner
HINT "AUDIO" is the component which has stored this code in the example shown in the illustration

CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION ASSEMBLY - 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 display and navigation assembly and the component which has stored this code.
  1. Disconnect all connectors between the display and navigation assembly and the component which has stored this code.
  2. Check for an open or short in the AVC-LAN circuit between the display and navigation assembly and the component which has stored this code.
    OK: There is no open or short circuit.
    
    Fig 3: 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 (DISPLAY AND NAVIGATION ASSEMBLY - 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 display and navigation assembly and the radio receiver
  1. Disconnect all connectors between the display and navigation assembly and the radio receiver
  2. Check for an open or short in the AVC-LAN circuit between the display and navigation assembly and the radio receiver
    OK: There is no open or short circuit.
    
    Fig 4: AVC-LAN Wiring Diagram
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
REPLACE DISPLAY AND NAVIGATION ASSEMBLY
1. Replace the display and navigation assembly with a normal one (see REMOVAL ) and check if the same problem occurs again.
  OK: Same problem does not occur.
NG: REPLACE COMPONENT WHICH HAS STORED THIS CODE

OK: END