DTC C1946: Malfunction in Signal from Steering Control ECU to Front Active Stabilizer Control ECU: Procedure

CHECK DTC (VGRS SYSTEM)
1. Turn the power switch OFF.
2. Connect the Techstream to the DLC3.
3. Turn the power switch ON (READY) and the Techstream on.
4. Check that VGRS system DTCs are not output. Refer to DTC CHECK / CLEAR .
  OK
  
  DTC is not output.
NG → See step 2

OK → See step 3
GO TO VGRS SYSTEM (DIAGNOSTIC TROUBLE CODE CHART). Refer to DIAGNOSTIC TROUBLE CODE CHART
REPLACE FRONT ACTIVE STABILIZER CONTROL ECU. Refer to REMOVAL