B1233

Code

Other B — Body

Glass Break Sensor Failure

Brand: Other

Type: B — Body

Views: UK: 33 EN: 46 RU: 34

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Page language: EN

Causes

Damaged or disconnected glass‑break sensor
Broken, shorted or corroded wiring or connector
Blown fuse or poor ground in the alarm/sensor circuit
Faulty alarm/BCM/occupant detection module receiving the sensor
Sensor misalignment, improper mounting, or heavy contamination
Software/configuration error or missing calibration

Symptoms

Security system shows fault or tamper warning
Glass break detection not triggering during test
False alarms or intermittent alarm activation
Indicator or message in driver information center regarding sensor fault
No reaction when attempting sensor functional test

What to check

Read and record all related codes and freeze frame data with a capable scan tool
Verify fuses and ground points for the alarm/sensor circuit
Visually inspect sensor, mount, and connector for damage, corrosion or water
Wiggle‑test the harness while observing live sensor data or fault status
Measure sensor supply voltage and signal at the connector with ignition ON
Check for TSBs or calibration/software updates for the alarm module

Signal parameters

Supply voltage: typically key‑on battery voltage at sensor supply pin (check service manual)
Analog sensor output: expected in normal range (example nominal mid‑range ~2.5 V); rapid transient when acoustic event occurs
Digital sensors: CAN/lin message present with periodic status (check bus traffic for the sensor ID)
Continuity: signal and supply wires should not be open; typical open-circuit = no continuity
Shorts: no short to ground or battery on sensor signal or supply circuits

Diagnostic algorithm

Retrieve all current and stored codes, then note any related body or alarm module codes.
Inspect the sensor and connector for water, corrosion, physical damage, or detachment from the glass/mount.
Verify fuses and ground connections for the alarm/body control module; clean and tighten grounds as needed.
With connectors connected, backprobing: measure sensor supply (battery) and ground; compare to expected. If missing, trace power feed and fuses.
Monitor the sensor signal with a multimeter or oscilloscope while performing an approved acoustic test (do not break glass). Look for a transient or change in voltage/ waveform. If no response, suspect sensor or wiring.
If the sensor output is normal at the connector, check the alarm/BCM input and bus messages. Verify the module is receiving the signal or CAN frames.
Perform a wiggle test on harness and connector while watching live data for intermittent faults.
If wiring is open/shorted, repair or replace damaged wiring and retest. If wiring and power are good but sensor shows no valid output, replace the sensor.
After repair or replacement, clear codes and perform a functional test or sensor calibration per manufacturer procedure. Verify no return of the DTC.
If DTC persists after sensor replacement, consider module replacement or reprogramming per factory diagnostics.

Likely causes

Loose or corroded connector at the sensor
Open circuit in the sensor supply or signal wire (broken harness)
Water intrusion into sensor or connector causing intermittent shorts
Failed sensor electronics (piezo element or amplifier)
Control module input failed despite correct sensor output

Fault status

⚠️ Status

Glass Break Sensor Failure — the system has detected a fault in the glass‑break/acoustic sensor circuit or the sensor’s output is out of expected range. Sensor may not detect break events or may cause false alarms.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours