B00D4

Code

Generic B — Body

Restraint System Malfunction Audible Indicator

Brand: Generic

Type: B — Body

Views: UK: 28 EN: 36 RU: 30

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Blown fuse or faulty relay supplying the audible indicator
Open or short in wiring between RCM and audible indicator (chime/buzzer/speaker)
Poor or corroded connector or pin at the audible indicator or RCM
Failed audible indicator (speaker, piezo buzzer or assembly)
Faulty RCM or internal driver circuitry
Low battery or unstable supply voltage during self-test

No restrain-system chime or audible warnings when expected (key on, ignition off buckle reminder, pre-collision alerts)
Continuous or intermittent chime that cannot be silenced
Airbag(s) or supplemental restraint system (SRS) warning light illuminated
Related restraint system warnings/messages displayed on dash
DTC B00D4 stored in RCM memory

Use a factory-level scan tool to read/record all RCM DTCs and freeze-frame data; attempt to command the chime/indicator via bi-directional controls
Verify battery voltage (12.0–14.5 V) and battery condition before testing
Inspect fuses and any relays that feed the audible indicator circuit
Visually inspect wiring and connectors for damage, pin corrosion, bent pins, or water intrusion at the audible unit and RCM
Check RCM and instrument cluster ground connections for corrosion or looseness
Check for network/communication DTCs (U-codes) that could affect audible command signals

Supply voltage to audible device: nominal vehicle battery 11–14.5 V (key ON)
Control signal: typically either switched +12 V or switched/grounded drive or PWM from RCM — 0–12 V logic range when active
Audible device impedance: varies by type — dynamic speaker coils often 4–32 Ω; piezo buzzers are high-impedance devices (kΩ)
Typical drive frequency for tonal chimes: hundreds to a few thousand Hz (depends on vehicle), duty cycle varies with tone
Current draw: generally low (

Record the code and all related DTCs with a scan tool; note ignition state and freeze-frame data
Clear the DTC and operate the vehicle through conditions that should produce the chime to see if the code returns
Check battery state-of-charge and connections; recharge or replace battery if low before further testing
Inspect fuses/relays for the chime/audible circuit; replace any blown fuses and retest
Visually inspect and gently wiggle wiring and connectors at the audible device and RCM while monitoring for change in behavior
With connector disconnected, measure supply voltage at the audible device connector with key ON; compare to battery voltage
Use a scope or DVOM to observe the control pin while commanding the chime from a scan tool; verify the presence of a switching or PWM control signal when commanded
Measure continuity between the RCM output pin and the audible device input pin; repair any opens or high-resistance sections
Bench-test the audible device (if removable) by applying a known safe test signal (use manufacturer guidance); replace the device if it fails to produce correct sound
If wiring, fuse and device test good, consider RCM driver failure; check for software updates or reprogramming history and consult service information before replacing the RCM
After repair, clear codes, re-test all audible functions and road-test to ensure the DTC does not return; verify no other SRS faults remain