DTC C1785: Steering Control ECU Communication Error [04/2013 - 10/2016]: Procedure

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [04/2013 - ]

   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 [04/2013 - 10/2016] 

Result: 

A 

See step  2

1. Check for VGRS system malfunction DTCs.

   Refer to DTC CHECK / CLEAR [04/2013 - 10/2016]

   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 [04/2013 - 06/2014]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2014 - 08/2015]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 10/2016] 

Result: 

B 

GO TO VGRS SYSTEM (DIAGNOSTIC TROUBLE CODE CHART). Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2013 - 10/2016]