Inspection Procedure

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

CHECK MULTI-DISPLAY POWER SOURCE CIRCUIT
1. Refer to the 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 Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the K53, K54 and K56 receiver connectors.

Measure the resistance of the receiver.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
K53-9 (TXM+) - K53-10 (TXM-)	60 to 80 Ω
K54-5 (ATX+) - K54-15 (ATX-)	60 to 80 Ω
K56-9 (TX+) - K56-10 (TX-)	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 TABLE

Display	Component
AUDIO H/U	Radio receiver
DSP-AMP	Stereo component amplifier
G/W	Gateway ECU

HINT:

"G/W" is the component which has stored this code in the example shown in the illustration.

Fig 2: Identifying Radio Receiver Connector Terminals

CHECK WIRE HARNESS (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, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
CHECK WIRE HARNESS (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, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
REPLACE MULTI-DISPLAY WITH NORMAL ONE AND CHECK
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