# NHTSA Preliminary Evaluation PE04012
> **HEADLIGHT SWITCH FAILURES** · Opened 2004-02-02 · Closed 2004-06-09
## Investigation
- **Action number:** PE04012
- **Type:** Preliminary Evaluation
- **Open date:** 2004-02-02
- **Close date:** 2004-06-09
- **Manufacturer:** THOMAS BUILT BUSES, INC.
- **Affected makes:** THOMAS
- **Affected components:** EXTERIOR LIGHTING:HEADLIGHTS:SWITCH; INTERIOR LIGHTING
- **Affected model years:** 1999, 2000, 2001, 2002
- **Affected (make, year) variants:** 14
## Summary

ODI HAS RECEIVED SEVERAL FAILED SWITCHES THAT SHOW SIGNS OF MELTING OR DAMAGE FROM OVER- HEATING.THE SWITCH SUPPLIER HAS INITIATED A TEST PROGRAM TO DETERMINE THE CAUSE OF THESE FAILURES.ODI IS CONCERNED ABOUT THE PRESENCE OF A HEAT SOURCE THAT POTENTIALLY COULD LEAD TO AN ELECTRICAL FIRE, AS WELL AS THE ABSENCE OF NECESSARY VEHICLE LIGHTING.ODI WILL CONTINUE ITS INVESTIGATION TO VERIFY THE EXTENT OF THE PROBLEM REPRESENTED BY THE REPORTED FAILURES AND EVALUATE THE ASSOCIATED RISKS.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=PE04012)
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