General Information

Smart Cruise Control
C1642 CAN signal error ESC - General Information

Component Location





General Description

VSM (Vehicle Stability Management) system is a safety system to reduce damage by using ESC, PSB (Pre-safe Seat Belt), SCC, Cluster under condition of a collision predicted. VSM control mechanism is as follows.
1. Preceding vehicle approaching : Cluster turns on yellow warning lamp.
2. Preceding vehicle approaching too close : ESC prepares breaking and PSB vibrates belt, Cluster turns on red warning lamp to inform danger to driver.
3. Under condition of a collision predicted : PSB retracts seat belt fully, ESC slows down the car and assist driver to make a proper break force according to situation.

DTC Description

SCC monitors CAN messages from ESC. SCC sets this code when abnormal message is received from ESC. System recovers to normal condition as soon as the signal is alright again.

DTC Detecting Condition





Diagnostic Circuit Diagram










Signal Waveform & Data




Monitoring CAN HIGH and LOW simultaneously is important in monitoring CAN communication waveform. When CAN HIGH signal rise to 3.5 V and LOW signal drops to 1.5 V - voltage difference between HIGH and LOW signal is 2 V - at BUS IDLE state (DIGITAL "1") whose reference voltage is 2.5 V, "0" is recognized. Besides, comparing HIGH and LOW signal if opposite waveform is detected with the reference voltage of 2.5 V, Check if current cam signal transfers correctly. Continuous "0" signal above 6BIT means the occurence of error in CAN communication. 1BIT is easily distinguished as calculating the time when "SOF" (START OF FRAME) which notifies the start of frame occurs. Check if "0" signal above 6BIT is detected continuously when monitoring CAN communication waveform.