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Circuit Inspection

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Fig 1: Driver Door Module System Circuit
G12320704Courtesy of KIA MOTORS AMERICA, INC.
Inspection Condition (+) Probe (-) Probe Specification
Channel Connector Terminal Channel Connector Terminal
  1. Ignition "ON" & Engine "OFF".
CH-A DDM Pin No. 3 (B-CAN High) CH-A Chassis ground - Fig.1
CH-B DDM Pin No. 4 (B-CAN Low) CH-B Chassis ground -
Fig 2: Screen Display - Normal B-CAN (High & Low) Signal Waveform - Time Frame 1MS
G12320705Courtesy of KIA MOTORS AMERICA, INC.
Good 
  • Disconnect B-CAN communication units one by one and monitor DTC to find the cause.
  • If the DTC is erased, check for proper operation. If the problem is corrected, replace the unit and go to "VERIFICATION OF REPAIR " procedure.
No Good 
  • Check for open, short to battery/ground in B-CAN line.
  • Repair as necessary, go to "VERIFICATION OF REPAIR " procedure.