Inspection Procedure

1. Enter the diagnostic mode.
   Fig 1: Service Check Mode Chart - 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 shown by the sub-code.

   HINT:

   • "190 (radio receiver)" is the component shown by the subcode in the example shown in Fig 1.
   • For details of the DTC display, refer to DTC CHECK / CLEAR .

NEXT 

1. 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 DESCRIPTION CHART
   
   

   Component	Proceed to
   Gateway ECU (1C6)	Gateway ECU power source circuit (See GATEWAY ECU POWER SOURCE CIRCUIT  )
   Stereo component amplifier (440)	Stereo component amplifier power source circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT  )
   Multi-display (Accessory meter) (1D4)	Multi-display power source circuit (See MULTI-DISPLAY POWER SOURCE CIRCUIT  )
   Tape player (320)	Tape player power source circuit (See TAPE PLAYER POWER SOURCE CIRCUIT  )

NEXT 

1. Disconnect the radio receiver connectors.
   Fig 2: Disconnecting Radio Receiver Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   TX+ (E15-9) - TX- (E15-10)	Always	60 to 80
   TXM+ (E17-9) - TXM-(E17-10) ((1))	Always	60 to 80
   ATX+ (E12-5) - ATX-(E12-15) ((2))	Always	60 to 80
   (1) with Tape Player (2) for 12 Speaker System

NG: REPLACE RADIO RECEIVER 

OK: GO TO NEXT STEP 

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.
   1. Disconnect all connectors between the radio receiver and the component shown by sub-code.
   2. 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. 

      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 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 

OK: END