Inspection Procedure

Refer to RADIO RECEIVER POWER SOURCE CIRCUIT  .

If the power source circuit is operating normally, proceed to the Next Step.

1. Enter diagnostic mode.
   Fig 1: Service Check Mode Flow Chart - Diagnostic Mode

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press the preset switch "3" to change the mode 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

   HINT:

   • "P440" set by the stereo component amplifier shown in the preceding illustration as an example.
   • 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 Table 

   COMPONENT REFERENCE CHART
   
   

   Component	Proceed to
   Stereo component amplifier	Stereo component amplifier power source circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT  )

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

   Standard Resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   E40-5 (ATX+) - E40-15 (ATX-)	Always	60 to 80 Ω

   Fig 2: Identifying E40 Radio Receiver Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE RADIO RECEIVER  (See REMOVAL  )

   OK: Go to Next Step 

HINT:

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

1. Referring to the following AVC-LAN Wiring Diagram, 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.
      Fig 3: AVC-LAN Wiring Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      There is no open or short circuit  .

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

1. Replace the component which has stored this code with a known good one and check if the same problem occurs again.

   OK: 

   Malfunction disappears  .

   NG: REPLACE RADIO RECEIVER  (See REMOVAL  )

   OK: END