All 10 units which consists of the Body Electrical Control System are linked by CAN*¹ line.
They are IPM(Inter Panel Module), FAM(Front Area Module), PDM(Power Distribution Module),
DDM(Drive Door Module), ADM(Assist Door Module), CLU(Cluster), PSM(Power Seat Module),
SCM(Steering Control Module), RAM(Rear Area Module), SMK(Smart Key).
*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 DTC which is related with communication error between IPM and other units. (※ Control Units : IPM(Inter Panel Module), FAM(Front Area Module), PDM(Power Distribution Module), DDM(Drive Door Module), ADM(Assist Door Module), CLU(Cluster), PSM(Power Seat Module), SCM(Steering Control Module), RAM(Rear Area Module), SMK(Smart Key)
)DTC is set when short circuit between CAN high and low, which is connected to CAN IC in DDM, is short to ground or battery. And, If Data can not be transferred, however, Data receiving is possible, via CAN line because of Software and Hardware failure of CAN.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
CAN commumication Line Check |
•
Short to battery or ground in CAN high circuit.
•
Short to battery or ground in CAN low circuit.
•
Short circuit between CAN low and CAN high
•
Poor Connection or Open in CAN low and CAN high circuit. |
Enable Conditions |
•
Not in START position with IGN Key
•
200mS after START position with IGN Key | |
Threshold Value |
•
CAN high /low : 0 V or B+ | |
Diagnostic Time |
•
Immediately | |
DTC Erasing Time |
•
DTC is erased immediately after trouble fixed |
Fig 1) CAN Low/High Signal Waveform
Fig 2) CAN BUS VOLTAGE LEVEL (LOW SPEED CAN)
