Inspection Procedure

Refer to the RADIO RECEIVER POWER SOURCE CIRCUIT .

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

1. Enter the diagnostic mode.
   Fig 1: Identifying Service Check Mode And Detailed Information Mode

   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: 

   COMPONENT REFERENCE CHART
   
   

   Component	Physical address
   Stereo component amplifier	440
   Television display assembly	1B0

   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 "DTC CHECK / CLEAR ".

1. Inspect the power source circuit of the component which has stored this code.

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

   COMPONENT REFERENCE CHART
   
   

   Component	Proceed to
   Stereo component amplifier	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
   Television display assembly	TELEVISION DISPLAY ASSEMBLY POWER SOURCE CIRCUIT

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

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   ATX+ (R7-5) - ATX - (R7-15) ((1))	Always	60 to 80 Ω
   TXM+ (R8-9) - TXM- (R8-10)	Always	60 to 80 Ω
   (1) 10 Speaker System

Fig 2: Identifying Connector Terminal Of R7 And R8 Of Radio Receiver
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RADIO RECEIVER 

OK: Go to next step 

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 component which has stored this code with a normal one and check if the same problem occurs again.

   OK: 

   Same problem does not occur. 

NG: REPLACE RADIO RECEIVER 

OK: END