All 6 units which consists of the Body Electrical Control System are linked by MM CAN line.
They are IPM(Intelligent integrated Platform Module), CLU(Cluster), HU(Head Unit), Monitor, RRC(Rear Remote Control), AMP(Amplifier).
MM(MultiMedia) CAN (Controller Area Network) : MM(MultiMedia) CAN is serial bus communication type which links not only communication system but also control units each other.
IPM: Intelligent integrated Platform Module SMK: Smart Key DDM: Driver Door Module ADM: Assistant Door Module PSM: Power Seat Module MFSW: Multi-Function Switch SWRC: Steering Wheel Remote Controller IMS SW:Integrated Memory System Switch SCM: Steering Column Module PCU: Power-train Control Unit ECU: Engine Control Unit EPB: Electronic Parking Brake ABS: Anti-lock Brake System ESC: Electronic Stability Control SCC: Smart Cruise Control CLUM: Cluster Module DATC: Dual Automatic Temp. Control SCC: Smart Cruise Control MDPS: Motor Driven Power Steering SAS: Steering Angle Sensor TPMS: Tire Pressure Monitoring System SRSCM: Supplemental Restraints System Control Module HU: Head Unit RRC: Rear Remote Control AMP: Amplifier
Type
Condition
Remark
1
MM CANH Circuit Open
B280100 is presented when IC detects one of errors among 7 types under normal communication condition.
According to operation condition, some of module which are connected to CAN line may not detect B280100.
Also, B280000 can be detected together.
2
MM CANL Circuit Open
3
MM CANH Circuit Short to Power
4
MM CANL Circuit Short to Power
5
MM CANH Circuit Short to Ground
6
MM CANL Circuit Short to Ground
7
MM CANH and CANL Short to each other
Item
Detecting Condition
Possible Cause
DTC Strategy
MM CAN Communication Check
IPM are not Sleep condition
MM CAN High Line short to battery
MM CAN Low Line short to battery
MM CAN High Line short to ground
MM CAN Low Line short to ground
MM CAN High and Low line short to each other
MM CAN High Line short to 5V power
MM CAN High Line open
MM CAN Low Line open
Under Sleep condition, MM CAN High Line is 0V and MM CAN Low Line is battery voltage.
Enable Conditions
IPM power on
(Under normal communication)
Threshold Value
MM CAN high : 0V or B+
MM CAN low : 0V or B+
Diagnostic Time
Immediately
DTC Erasing Time
DTC is erased immediately after trouble fixed
Fig.1) MM CAN Low/High Signal Waveform
Fig.2) MM CAN BUS Voltage Level (Low Speed CAN)