Inspection Procedure

Refer to the radio receiver power source circuit (See RADIO RECEIVER POWER SOURCE CIRCUIT ).

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

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

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   ATX+ - ATX-	Always	60 to 80 Ω
   TXM+ - TXM-	Always	60 to 80 Ω
   TX+ - TX-	Always	60 to 80 Ω

Fig 1: Identifying Radio Receiver Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RADIO RECEIVER 

OK: Go to next step 

1. Enter the diagnostic mode.
   Fig 2: Detailed Information Mode And Service Check Mode - Communication Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press the preset switch "3" to change to "Detailed Information Mode".
3. Identify the component which has stored this code.

Component Table: 

HINT:

• "440 (stereo component amplifier)" is the component which has stored this code in the example shown in the illustration.
• For details of the DTC display, refer to the DTC CHECK/CLEAR .

HINT:

For details of the connectors, refer to the TERMINALS OF ECU .

1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the radio receiver and the component which has stored this code.
   1. Disconnect all connectors between the radio receiver and the component which has stored this code.
   2. Check for an open or short in the AVC-LAN circuit between the radio receiver 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 

1. Replace the radio receiver 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