Display and Navigation Assembly Communication Error: Procedure

1. Enter the diagnostic mode.
   Fig 1: Screen Display - LAN Monitor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component shown by the sub-code.

   HINT: 

   • "118 (display and navigation assembly)" is the component shown by the sub-code in the example shown in the illustration.
   • The sub-code will be indicated by its physical address.
   • For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION". Refer to DIAGNOSIS DISPLAY DETAILED DESCRIPTION .

NEXT: Go to next step 

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 TABLE
   
   

   Display	Proceed to
   Radio receiver (190)	Radio receiver power source circuit. Refer to Radio Receiver Power Source Circuit
   Stereo component amplifier (440)	Stereo component amplifier power source circuit. Refer to Stereo Component Amplifier Power Source Circuit
   Clock (1D6)	Clock power source circuit. Refer to Clock Power Source Circuit
   Television display (1F6)*1	Television display power source circuit. Refer to Television Display Power Source Circuit
   Disc player (1A0)*2	Disc player controller power source circuit. Refer to Disc Player Controller Power Source Circuit
   Parking assist ECU (1AC)*3	Parking assist ECU power source circuit. Refer to ECU Power Source Circuit
   Rear power seat module switch (1C0)*5	Rear seat control switch power source circuit. Refer to Rear Seat Control Switch Power Source Circuit
   Satellite radio tuner (1F1)*4	Satellite radio tuner power source circuit. Refer to Satellite Radio Tuner Power Source Circuit

   HINT: 

   *1: w/ Rear Seat Entertainment System

   *2: w/ Disc Player

   *3: w/ Advanced Parking Guidance System

   *4: w/ Satellite Radio Tuner

   *5: w/ Rear Power Seat Module Switch

NEXT: Go to next step 

Fig 2: Identifying Radio Receiver's L51, L52 and L53 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L51, L52 and L53 receiver connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L51-5 (ATX+) - L51-15 (ATX-)	Always	60 to 80 Ω
   L52-9 (TX+) - L52-10 (TX-)
   L53-9 (TXM+) - L53-10 (TXM-)

NG → See step   6 

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". Refer to TERMINALS OF ECU .

1. Referring to the AVC-LAN wiring diagram, check the AVC-LAN circuit between the display and navigation assembly and the component shown by the sub-code.
   1. Disconnect all connectors between the display and navigation assembly and the component shown by the sub-code.
   2. Check for an open or short in the AVC-LAN circuit between the display and navigation assembly 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 → See step   7 

OK → END