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 SMK Module connector and chassis ground.
5. Measure signal waveform of B-CAN-LOW terminal of SMK Module connector and chassis ground.

   Specification:  Refer to Signal Waveform And Data 

   Fig 1: CAN Network

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: B-CAN System Connectors

   Courtesy of HYUNDAI MOTOR AMERICA
6. Is the measured signal waveform normal?

   YES 

   • Check poor connection between harness connector and Smartkey Module

     : Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to "Verification Of Vehicle Repair " procedure.

   • Disconnect IPM, M/F S/W, SMK, DDM, ADM, PSM, SCM, IMS, SWRC one by one and then, check that DTC is erased with scantool.
   • Substitute with a known-good module and check for proper operation. If the problem is corrected, replace module and then go to "Verification Of Vehicle Repair " procedure.

   NO 

   • If the measured value is battery voltage, check short to battery in CAN line. Repair or replace as necessary. And then, go to "Verification of Vehicle Repair " procedure. In case that Communication is in sleep mode, 12V will be measured. Therefore, check that communication is in Wake up status.
   • If 0V is detected, Check short to ground, short between CAN high and low each other or open in CAN high or CAN low harness. Repair or replace as necessary and then, go to "Verification of Vehicle Repair " procedure.