Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

IDENTIFY COMPONENT SHOWN BY THE SUB-CODE

Fig 1: Identifying Display Screen - Service Check Mode (Example)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Enter the diagnostic mode.
2. Press the preset switch "2" 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.
  - 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

POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

Component	Proceed to
Stereo component amplifier (440)	Stereo component amplifier power source circuit
Television display assembly (1F6)*	Television display assembly power source circuit
HINT: *: w/ Rear seat entertainment system

INSPECT RADIO RECEIVER ASSEMBLY

Fig 2: Identifying R1 Receiver Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the R1 receiver connector.

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

Standard resistance

RADIO RECEIVER ASSEMBLY

Tester Connection	Condition	Specified Condition
R1-5 (ATX+) - R1-15 (ATX-)	Always	60 to 80 Ω

NG: REPLACE RADIO RECEIVER ASSEMBLY

OK: Go To Next Step

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - 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 radio receiver and the component shown by the sub-code.
  
  Fig 3: Identifying AVC-LAN Wiring Diagram
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.
    OK: There is no open or short circuit.
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 RADIO RECEIVER ASSEMBLY

OK: END