Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. 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 Diagnostic Flow Diagram
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press the preset switch "3" to change to "Detailed Information Mode".
3. Identify the component shown by the sub-code.
  HINT:
  - "190 (radio receiver)" is the component shown by the sub-code in the example shown above.
  - For details of the DTC display, refer to DTC CHECK/CLEAR .

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 TABLE

Component	Proceed to
Television display assembly (1B0)	See TELEVISION DISPLAY POWER SOURCE CIRCUIT
Stereo component amplifier (440)	See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
Radio receiver (190)	See RADIO RECEIVER POWER SOURCE CIRCUIT

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.

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

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester connection	Condition	Specified condition
ATX+ - ATX-	Always	60 to 80 Ω
TX+ - TX-	Always	60 to 80 Ω
TX+ - TX-	Always	60 to 80 Ω

NG: REPLACE RADIO RECEIVER

OK: Go to Next step

CHECK HARNESS AND CONNECTOR (GATEWAY ECU - 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 gateway ECU and the component shown by the sub-code.
  1. Disconnect all connectors between the gateway ECU and the component shown by the sub-code.
  2. Check for an open or short in the AVC-LAN circuit between the gateway ECU and the component shown by the sub-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
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 GATEWAY ECU

OK: END