Display and Navigation Assembly Communication Error: Procedure

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

   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 module display)" 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 in the System Description. Refer to SYSTEM DESCRIPTION .

NEXT: Go to next step 

1. Inspect the power source circuit of the component shown by the sub-code.
   COMPONENT TABLE
   
   

   Component	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
   Parking assist ECU (1AC)	Parking assist ECU power source circuit. Refer to Clearance Sonar Main Switch Circuit
   Satellite radio tuner (1F1)	Satellite radio tuner power source circuit. Refer to Satellite Radio Tuner Power Source Circuit
   Television display (1F6)	Television display power source circuit. Refer to Television Display Power Source Circuit

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

NEXT: Go to next step 

Fig 2: Identifying F1, F23 And F24 Receiver Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the F1, F23 and F24 receiver connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F1-5 (ATX+) - F1-15 (ATX-)	Always	60 to 80 Ω
   F23-9 (TX+) - F23-10 (TX-)	Always	60 to 80 Ω
   F24-9 (TXM+) - F24-10 (TXM-)	Always	60 to 80 Ω

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 module display and the component shown by the sub-code.
   1. Disconnect all connectors between the display and navigation module display and the component shown by sub-code.
   2. Check for an open or short in the AVC-LAN circuit between the display and navigation module display and the component shown by the sub-code.

      OK

      There is no open or short circuit.

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