Welcome Light Sequence Malfunction
The B0099 code means the vehicle's onboard diagnostic system has detected: Welcome Light Sequence Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $50 - $300 (parts and labor)
Basic scanners skip body codes entirely. BlueDriver reads airbag, HVAC, lighting, and BCM codes through your phone.
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Common Symptoms
- Welcome sequence does not activate
- Lights do not illuminate in sequence when unlocking
- Partial welcome sequence
- Welcome light feature disabled
Probable Causes (Ranked by Likelihood)
- BCM welcome light software fault Very High
- Key fob proximity detection failure High
- Exterior light modules not responding Moderate
- CAN bus timing error during sequence Low
Step-by-Step Diagnostic Procedure
-
Scan BCM for welcome light DTCs
-
Verify key fob proximity sensor
-
Test individual lights in sequence
-
Check BCM feature configuration
Frequently Asked Questions
What is the welcome light sequence?
A choreographed illumination when you approach with the key fob.
Can I customize it?
Some manufacturers allow customization via infotainment or companion app.
Does it drain the battery?
The proximity sensor draws minimal power. Malfunction could cause repeated activation.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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