Network, generic

U054B Invalid Data Received From Interior Lighting Control Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Interior lighting control module A runs cabin illumination such as dome, footwell and ambient light strips, in newer cars often RGB LED nodes on a LIN line below the body controller. Microchip's reference ambient lighting module shows the data involved: the master sends a command frame with zone, colour shares and intensity and asks for a status frame in return, each protected by a LIN checksum at 10.4 kbit/s. When status content from module A arrives but is implausible or corrupted, the receiver stores U054B; if the module stays silent, U024A applies, and module B has U05C0. No manufacturer documents U054B. Courtesy lights may then stay off, colour or brightness may change unexpectedly, or entry lighting may fail.

Likely causes

LED driver node or lighting module internally faulty
Chafed LIN line or loose connector in trim or headliner
Wrong vehicle configuration for the lighting variant

Symptoms

  • Interior or ambient lights stay off or flicker
  • Ambient colour or brightness differs from the setting

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

interior lighting module a

Related codes

U024AU05C0

References: http:, en.wikipedia.org.