DTC C1785: Steering Control ECU Communication Error [09/2014 - ]: Procedure

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - ]

   Chassis > Air suspension > Trouble Codes 

   Result

   Result	Proceed to
   CAN DTC is not output	A
   CAN DTC is output	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 10/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ] 

Result: 

A 

See step  2

1. Check for VGRS system malfunction DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 09/2020] , or refer to DTC CHECK / CLEAR [09/2020 - ]

   Chassis > VGRS > Trouble Codes 

   Result

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 10/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 11/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2019 - 09/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2020 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

Result: 

B 

GO TO VGRS SYSTEM (DIAGNOSTIC TROUBLE CODE CHART). Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2014 - 11/2017]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2017 - 09/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2020 - ]