Inspection Procedure

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

CHECK MULTI-DISPLAY POWER SOURCE CIRCUIT
Refer to MULTI-DISPLAY POWER SOURCE CIRCUIT ).

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

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.
Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION

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

NG: REPLACE RADIO RECEIVER

Fig 1: Disconnecting Radio Receiver Connectors

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Go to next step

IDENTIFY THE 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 TABLE

Display	Component
AUDIO H/U	Radio receiver
DSP-AMP	Stereo component amplifier
G/W	Gateway ECU
NAVI	Navigation ECU
Rr-TV	Television display assembly

HINT:

"NAVI" is the component which has stored this code in the example shown in the illustration.

Fig 2: Diagnostic Tool Display - System Check Mode And LAN Monitor Screen

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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: 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
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.
  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.
  Fig 4: 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
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