Body, generic

B00D4 Restraint System Malfunction Audible Indicator

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B00D4 concerns the audible restraint warning, the tone that stands in when a fault cannot be shown by the lamp. Ford's 2014 F-150 manual describes it: system readiness is signalled by the warning light, or by a backup tone if the light is out, and a problem announces itself as five beeps in a row, repeated until the fault and the lamp are put right. Audi's 1986 patent explains why such a fallback exists: a blown fuse could kill both the airbag module and its lamp, so the driver would believe the system was fine; it mentions an audible alarm as an alternative signal. No carmaker publishes B00D4. A stored code means the restraint module sees a fault in its chime or speaker path, so a later lamp failure could go wholly unannounced.

Likely causes

Open or shorted lead to the chime or speaker used for restraint warnings
Chime module or cluster speaker failed
Tone request from the restraint module not received by the sounding unit

Symptoms

  • No warning tone where one would be expected, other warning chimes may also be silent
  • Airbag warning lamp on
  • Safety note: fallback warning missing; work on cluster and restraint wiring only de-energised (ignition off, battery off, wait time), specialist workshop

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–500
Time0.3–2 h

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

Parts involved

srs audible indicatorinstrument clustersrs control module

Related codes

B00D2B00D3

References: fordservicecontent.com, patents.google.com, law.cornell.edu.