This DTC sets when a communication error between SJB and other control units occur.
※ Body CAN communication Control Units : BCM(Body Control Module), CLU(Cluster), SMK(Smart Key), SJB(Smart Junction Box), PSM(Power Seat Module).
CAN (Controller Area Network) : CAN is a serial bus type communication which links control units.
LIN (Local Interconnect Network) : LIN is serial communication type which is used in electrical control system. (This is less expensive)
Type | Condition | Remark |
1 | CANH Circuit Open | B1602 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 B1602.Also, B1603 can be detected together. |
2 | CANL Circuit Open | |
3 | CANH Circuit Short to Power | |
4 | CANL Circuit Short to Power | |
5 | CANH Circuit Short to Ground | |
6 | CANL Circuit Short to Ground | |
7 | CANH and CANL Short to each other |
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
CAN Communication Check |
•
BCM, SJB are not Sleep condition 1. CAN High Line short to battery 2. CAN Low Line short to battery 3. CAN High Line short to ground 4. CAN Low Line short to ground 5. CAN High and Low line short to each other 6. CAN High Line short to 5V power 7. CAN High Line open 8. CAN Low Line open caution Under Sleep condition, CAN High Line is 0V and CAN Low Line is battery voltage. |
Enable Conditions |
•
BCM, SJB power on (Under normal communication) | |
Threshold Value |
•
CAN high : 0V or B+
•
CAN low : 0V or B+ | |
Diagnostic Time |
•
Immediately | |
DTC Erasing Time |
•
DTC is erased immediately after trouble fixed |
Fig 1) CAN Low/High Signal
Fig 2) CAN BUS VOLTAGE LEVEL (LOW SPEED CAN)
