LEMON Manuals: Even more car manuals for everyone
Home >> Kia >> 2012 >> Optima LX, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Smart Key Unit Diagnosis) >> DTC B1603: CAN Bus Off >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

WARNING: This page is about a different car, the 2013 Kia Sportage and 2012 Kia Sportage. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTING CONDITION CHART

Item Detecting Condition Possible cause
DTC Strategy
  • CAN signal check
  1. Poor connection
  2. Power supply to Smartkey Unit (PIC IMMO Unit)
  3. Short to battery or ground in CAN high or low signal tone
  4. Smartkey Unit (PIC IMMO Unit)
Enable Conditions
  • IG ON or Engine ON
Threshold value
  • CAN high/low: Voltage is "0" means short to ground, Voltage is "B+" means short to battery
Diagnostic Time
  • Right after DTC detected