DTC U1020-00: Lost Communication with Ethernet [10/2022 - ]: Procedure

Pre-procedure1

• Disconnect the C7 radio and display receiver assembly connector.
• Disconnect the C20 combination meter assembly connector.

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  C7-2 (ETH+) - C20-1 (ET+)	Always	Below 1 Ω	Ω
  C7-1 (ETH-) - C20-2 (ET-)	Always	Below 1 Ω	Ω
  C7-2 (ETH+) or C20-1 (ET+) - Body ground	Always	10 kΩ or higher	kΩ
  C7-1 (ETH-) or C20-2 (ET-) - Body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Check if the meter & gauge system is malfunctioning.

   HINT: 

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Clear the DTCs.

   Body Electrical > Navigation System > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

Pre-procedure1

• Turn the ignition switch off.
• Turn the ignition switch to ON and wait for 45 seconds.
• Turn the ignition switch off.
• Turn the ignition switch to ON and wait for 45 seconds.

• Check for DTCs and proceed to the following step.

  Body Electrical > Navigation System > Trouble Codes 

  Result

  Result	Proceed to
  DTCs are not output	A
  U1020-00 is output	B

Post-procedure1

• None

Result: 

A 

END (COMBINATION METER ASSEMBLY) 

Result: 

B 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2022 - ]