The B1105 code on your 2020 Kia Sportage indicates a malfunction in the dome lamp (interior light) circuit. This code affects your Sportage's interior lighting system, signaling an electrical fault detected by the body control module in the overhead lighting circuit.
Understanding B1105 on Kia Sportage
The dome lamp circuit includes the overhead light fixture, door switches (for automatic on/off), body control module, and associated wiring. Code B1105 indicates the BCM has detected abnormal current draw or circuit feedback from this system.
Common Symptoms
- Dome light doesn't work
- Dome light stays on constantly
- Dome light flickers
- Light doesn't respond to door opening
- Dimmer function not working
- Battery drain (if stuck on)
Primary Causes
- Burned out dome lamp bulb
- Faulty dome lamp switch
- Door jamb switch stuck or faulty
- Wiring damage in headliner
- BCM dome light driver fault
- Short circuit in dome light wiring
Diagnostic Procedure for 2020 Sportage
First, try replacing the dome lamp bulb. Using Kia scan tool, access interior light circuit data. Check door jamb switches for proper operation. Test dome light switch in fixture. Check for voltage at dome light with doors open and closed. Inspect wiring in headliner for damage. Monitor BCM dome lamp output.
Repair Solutions
Replace burned out bulb with correct wattage. Replace faulty dome light fixture/switch. Repair or replace stuck door jamb switches. Fix damaged wiring in headliner. If BCM driver is faulty, BCM programming or replacement may be needed. Clear codes and verify proper automatic and manual dome light operation.