DTC 5-1: LEXUS Link Communication Error: Procedure

1. Turn the ignition switch from ON to OFF.
2. Turn the ignition switch ON and wait 10 seconds.
3. Check for the DTC again and wait for 20 seconds.

   OK

   DTC 5-1 is not output.

OK → CLEAR HISTORIC DTC 

NG: Go to next step 

1. Check for DTC using the intelligent tester (with CAN VIM).

   HINT: 

   The mayday ECU assembly is connected to the BEAN. Check that there are no multiplex communication system DTCs present.

   PROCEED TO
   
   

   Result	Proceed to
   No DTC	A
   Related to multiplex communication system	B

   NOTE:

   If replacement of the ECU is necessary, replace the mayday battery (backup battery) together with the ECU. After the replacement, register the ECU. Refer to REGISTRATION .

B → See step   4 

A → See step   3