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HOMESERVICE MANUALSKIA2015OPTIMA LIMITEDREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSSMART KEY UNIT DIAGNOSIS - OPTIMA (EXCEPT HEV)DTC B1609: CAN TIME-OUT BETWEEN SMK AND SJBW/HARNESS INSPECTIONCAN COMMUNICATION LINE INSPECTION
2015 Kia Optima Limited

CAN Communication Line Inspection

2015 Kia Optima LimitedSECTION 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 & DATA .

  6. Is the measured signal waveform normal?

    YES 

    • Go to next 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.
  • Check open in CAN communication line 
  1. IG KEY OFF.
  2. Disconnect BCM (IPM) (Intelligent integrated Platform Module), SMK Module, SJB (Smart Junction Box) connector.
  3. Measure resistance between communication line terminal of Smart Key Module connector and communication line of SJB harness connector.

    Specification :  About below 1Ω

  4. Is the measured resistance within specification?

    YES 

    • Check poor connection between harness connector and Smart Key Module or SJB

      : 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.

    • Substitute with a known-good "SMK IMMO, SJB" and check for proper operation. If the problem is corrected, replace "SMK IMMO, SJB" and Go to VERIFICATION OF VEHICLE REPAIR  procedure.
    • Perform "Key Teaching" procedure for SMK IMMO. with GDS.

    NO 

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.