Smart Key System

General Description

CAN Communication is a circuit, consists of CAN LOW and CAN HIGH, in order to communicate among control units.
Control Modules are respectively communicating via CAN line in order to control Body Electrical.

DTC Description

Smart key Module sets DTC B1603 if smart key module detects short to battery, short to ground in CAN HIGH and CAN low simultaneously.
This DTC means that both CAN HIGH and CAN LOW line are error. Therefore, CAN communication is not available.

DTC Detecting Condition






Diagnostic Circuit Diagram






Signal Waveform & Data






Monitor Scantool data

Check DTC
1. Check DTC with scantool.
2. Check DTC related CAN communication is set on Smart key Module and every modules.
3. If there is DTC related Module Check the DTC according to troubleshooting guide.
4. Repair and erase the DTC with Scantool.
5. Is the DTC erased ?






Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.
3. Has a problem been found?






CAN communication Line Inspection

Check CAN communication
1. Connect all of control module connector.
2. IG KEY ON.
3. Make CAN communication is wake up status (Ex. ON/OFF Door SW)
4. Measure signal waveform of B-CAN-HIGH terminal of Diagnostic connector and chassis ground.
5. Measure signal waveform of B-CAN-LOW terminal of Diagnostic connector and chassis ground.

Specification :Refer to Signal waveform and Data

6. Is the measured signal waveform normal ?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the scantool.
3. Are any DTCs present?