B1609 on 2021-2025 Kia K5 — Illuminated Entry Input Short Circuit to Battery
1 vehicles · 1 makes
How to diagnose and fix B1609: most-reported vehicles
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Kia K5 · 2021–2025
The K5 infotainment system — both the 8-inch and 10.25-inch displays — experiences random screen blackouts, freezes, and spontaneous reboots. The screen may go completely black while driving, losing access to navigation, backup camera, and climate controls. Some owners report the system rebooting in a loop. The issue is typically software-related but can also be caused by a failing display head unit. Android Auto and Apple CarPlay connections can trigger or worsen the problem.
Common Symptoms
- Infotainment screen goes completely black while driving
- System freezes and becomes unresponsive to touch
- Screen reboots with Kia logo repeatedly
- Backup camera unavailable when in reverse
- Bluetooth audio cutting out
- Climate controls unresponsive on touchscreen-only models
How to Fix
First try a system reset by holding the power/volume knob for 10+ seconds. Visit a Kia dealer for the latest infotainment software update — Kia has released multiple updates addressing stability issues (check for updates via the Kia Connect app or USB update). If the software update does not resolve the issue, the head unit may need replacement under warranty ($800-$2,000 if out of warranty). Disconnect the phone and disable wireless CarPlay/Android Auto to test if the issue is phone-related. A factory reset of the infotainment (Settings > General > Reset) can also help.
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Owner tips & cautions
- TipBefore going to the dealer, try a USB software update. Download the latest navigation/infotainment update from the Kia owners portal, put it on a USB drive, and install it. Many blackout issues are fixed by the latest software.
- TipIf the screen goes black, hold the power knob for 10 seconds to force a reboot. This is faster than disconnecting the battery and usually restores the system immediately.
Sources for this issue (1)
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B1609 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B1609 mean?
B1609 stands for "Illuminated Entry Input Short Circuit to Battery." This is a manufacturer-specific (Ford-family) body code relating to the illuminated entry system, which turns on the interior courtesy lights when you unlock or open a door. The body control module detected an abnormally high voltage on that input circuit, consistent with a short to battery (power) voltage. It is generally a convenience-lighting fault and does not affect how the vehicle drives, though it can cause lights to misbehave or drain the battery. Exact meaning can vary by manufacturer.
What are the most common causes of B1609?
The most common causes of B1609 are: Short to power in the illuminated entry or courtesy lamp wiring, Faulty or stuck door ajar / door jamb switch, Chafed or pinched wiring in a door harness, Corroded or damaged connector at a door switch, Faulty keyless/illuminated entry module, Faulty body control module. The specific cause varies by vehicle.
How much does it cost to fix B1609?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by B1609?
Au7o has documented B1609 across 1 vehicle models from 1 manufacturers: Kia.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.