Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

IDENTIFY THE COMPONENT SHOWN BY SUB-CODE
1. Enter the diagnostic mode.
  
  Fig 1: Identifying Display Screen - Stereo Component Amplifier Communication
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component shown by the sub-code.
  HINT:
  - "110 (multi-display)" is the component shown by the sub-code in the example shown in Fig 1.
  - The sub-code will be indicated by its physical address.
NEXT

CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

Inspect the power source circuit of the component shown by the sub-code.

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

COMPONENT TABLE

Component	Proceed to
Radio receiver (190)	Radio receiver power source circuit (See RADIO RECEIVER POWER SOURCE CIRCUIT )
Gateway ECU (1C6)	Gateway ECU power source circuit (See GATEWAY ECU POWER SOURCE CIRCUIT )
Multi-display (110)	Multi-display power source circuit (See MULTI-DISPLAY POWER SOURCE CIRCUIT )
Navigation ECU (178)	Navigation ECU power source circuit (See NAVIGATION ECU POWER SOURCE CIRCUIT )
Clock assembly (1D6)	Clock power source circuit (See CLOCK POWER SOURCE CIRCUIT )

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.

Fig 2: Identifying Radio Receiver Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

STANDARD RESISTANCE SPECIFIED CONDITION

Tester Connection

Condition

Specified Condition

ATX+ (E12-5) - ATX- (E12-15) (⁽¹⁾)

Always

60 to 80

TX+ (E15-9) - TX- (E15-10)

Always

60 to 80

⁽¹⁾	for 12 Speaker System

NG: REPLACE RADIO RECEIVER

OK: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - COMPONENT SHOWN BY SUB-CODE)
HINT:
- Start the check from the circuit that is near the component shown by the sub-code first.
- 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 stereo component amplifier and the component shown by the sub-code.
  1. Disconnect all connectors between the stereo component amplifier and the component shown by sub-code.
  2. Check for an open or short in the AVC-LAN circuit between the stereo component amplifier and the component shown by the sub-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
REPLACE COMPONENT SHOWN BY SUB-CODE
1. Replace the component shown by the sub-code with a normal one and check if the same problem occurs again.
  OK:
  
  Same problem does not occur.
NG: REPLACE STEREO COMPONENT AMPLIFIER

OK: END