CAN Communication Line Inspection

■ Check CAN communication 

1. Ignition "ON" (Power Button LED "Red")
2. Set-up the oscilloscope as mentioned below.
3. Back probe and measure signal waveform of Pin No. 1 (High) terminal of Passenger side Body sense sensor ECU connector and chassis ground.
4. Back probe and measure signal waveform of Pin No. 2 (Low) terminal of Passenger side Body sense sensor ECU connector and chassis ground.

   Specification:  Refer to Figure below

   Fig 1: Screen Display - Diagnostic Trouble Code (DTC) Signal Waveform

   Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured resistance within specifications?

   YES 

   • Fault is intermittent caused by poor contact in the part's and/or SRSCM connector or was repaired and SRSCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

   NO 

   • Go to "Check CAN communication Line" procedure.

■ Check CAN communication Line 

1. Ignition "OFF"
2. Disconnect Passenger side Body sense sensor ECU connector and SRSCM main harness connector.
3. Measure resistance between Pin No. 1 (High) terminal of Passenger side Body sense sensor ECU harness connector and Pin No. 44 (High) terminal of SRSCM harness connector.
4. Measure resistance between Pin No. 2 (Low) terminal of Passenger side Body sense sensor ECU harness connector and Pin No. 43 (Low) terminal of SRSCM harness connector.

   Specification:  approx. 1 Ω below

   Fig 2: Screen Display - Multimeter (Channel B Only; 0.600)

   Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured resistance within specifications?

   YES 

   • Carefully re-do this troubleshooting guide steps.
   • If problem still occurs, replace Passenger side Body sense sensor ECU and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Check for open in CAN(High) and CAN(Low) communication line and SRSCM, and repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.