General Information

Power Distribution Module

B1987 Sub Micom Failed - General Information

Component Location





General Description

This is DTC which is related with communication error between PDM and other units.
** Body CAN communication Control Units : BCM (Body Control Module), CLU (Cluster), PDM (Power Distribution Module), SMK (Smart Key), SJB (Smart Junction Box).
* CAN (Controller Area Network): CAN is serial bus communication type which links not only communication system but also control units each other.






DTC Description

This code reports the malfunction of NEC MCU inside PDM. This is the case which there is the NEC MCU communication error.

DTC Detecting Condition





Diagnostic Circuit Diagram










Signal Waveform & Data








Fig 1) Signal waveform of CAN Low and HIGH
Fig 2) CAN BUS VOLTAGE LEVEL (LOW SPEED CAN)