Inspection Procedure

Refer to the NAVIGATION RECEIVER ASSEMBLY POWER SOURCE CIRCUIT  .

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

Fig 1: Inspecting Navigation Receiver Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the navigation receiver assembly connector.
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
   TX+ (R7-5) - TX- (R7-15)	Always	60 to 80 Ω

NG: REPLACE NAVIGATION RECEIVER ASSEMBLY 

OK: Go to next step 

1. Enter the diagnostic mode.
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component which has stored this code.

   Component Table: 

   COMPONENT CHART
   
   

   Display	Component
   DSP-AMP	Stereo component amplifier

   HINT:

   "AVN" is the component which has stored this code in the example shown in the illustration.

   Fig 2: Screen Display - LAN Monitor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

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 navigation receiver assembly and the component which has stored this code.
   1. Disconnect all connectors between the navigation receiver assembly and the component which has stored this code.
   2. Check for an open or short in the AVC-LAN circuit between the navigation receiver assembly 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 navigation receiver assembly 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