General Information

Multi Function Switch

B1554 Turn Signal Multifunction Switch Error - General Information

Component Location





General Description

All 13 units which consists of the Body Electrical Control System are linked by CAN* line.
They are IPM (Inter Panel Module), FAM (Front Area Module), PDM (Power Distribution Module), DDM (Drive Door Module), ADM (Assist Door Module), ECW (Electronic Control Wiper), CLU (Cluster), MFSW (Multi Function Switch), PSM (Power Seat Module), SCM (Steering Control Module), PTM (Power Trunk Lid Module), FBWS (Front Back Warning System), DATC (Dual Auto Temperature Control Module).
MFSW (Multi Function Switch) reports DTC code by checking the error state of cruise switch, audio switch, head lamp switch, wiper switch.
1) CAN (Controller Area Network): CAN is serial bus communication type which links not only communication system but also control units each other.
2) LIN (Local Interconnect Network): LIN is serial communication type which is used in electrical control system. (This is less expensive.)






DTC Description

This code is outputted when MFSW receives over two signals (turn right & turn left) of turn signal at the same time.

DTC Detecting Condition





Diagnostic Circuit Diagram