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Home / DTC / B1233 — Glass break sensor failure

B1233 — Glass break sensor failure

Detailed page for trouble code B1233.

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59brands
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22,491specific
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B1233

LAND ROVER B — Body

Glass break sensor failure

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or degraded glass break sensor (piezo or microphone element)
  • Open, short or intermittent wiring between sensor and control module
  • Corroded or loose connector(s)
  • Blown fuse or loss of sensor power/ground
  • Water ingress or physical damage to sensor
  • Faulty body control module (BCM) input or software fault

Symptoms

  • Alarm does not trigger when glass is struck or broken
  • False alarms or random alarm triggering
  • Warning light or message about intrusion/glass break sensor
  • Diagnostic trouble code B1233 stored; related security/BCM faults present
  • Glass break sensor indicator (if fitted) inactive or behaves abnormally

What to check

  • Read and record stored DTCs and freeze frame with a capable scan tool; check for related codes (BCM, CAN bus)
  • Visual inspection of glass break sensor location for physical damage or water ingress
  • Inspect connectors for corrosion, bent pins, or moisture; reseat connectors
  • Check relevant fuse(s) and fusible links for continuity
  • Verify battery voltage at key-on and sensor harness power pin (nominal ~11–14 V)
  • Measure continuity/ resistance of signal and ground circuits to the BCM

Signal parameters

  • Sensor power: nominal vehicle battery 12 V (expected ~11–14 V at key on/run)
  • Ground: low resistance path to chassis/BCM ground (
  • Sensor output: typically an analog pulse or voltage/frequency change on impact (idle ~small offset, event = transient pulse)
  • Expected event signal: short-duration pulses or high-frequency content when glass is struck (varies by sensor type)
  • Communications: BCM may report sensor status via CAN messages (glass_break_status / event_count)
  • Note: exact voltages/frequencies are manufacturer-specific; consult Land Rover technical data for precise values

Diagnostic algorithm

  1. Connect an appropriate diagnostic scan tool; record DTC B1233 and any related codes. Clear codes and attempt to reproduce.
  2. Inspect sensor and harness visually for damage, corrosion, moisture, or signs of recent glass replacement. Repair any obvious issues.
  3. Check fuses and power supply to sensor circuit. Repair/replace fuse if blown and investigate cause of failure.
  4. Backprobe power and ground pins at the sensor connector. Verify stable supply voltage and good ground with ignition on.
  5. With a scope or multimeter capable of capturing transients, monitor the sensor output while gently tapping the glass near the sensor to confirm output pulses. If no response, suspect sensor or wiring.
  6. Check continuity and resistance between the sensor output and the corresponding BCM input pin. Repair any opens or shorts.
  7. Inspect/repair any splices or harness sections routed through doors/pillars where chafe occurs. Replace damaged wiring as required.
  8. Verify BCM receives the sensor signal or CAN messages. If BCM does not see the input but wiring and sensor test good, consider BCM fault or reflash of module software.
  9. If wiring and module OK, replace sensor and retest. After replacement, perform any required calibration or teach-in procedure per Land Rover service manual.
  10. After repairs, clear codes and perform final verification: confirm alarm behavior and that DTC does not return during road/test environment.

Likely causes

  • Sensor element failure (most common)
  • Connector corrosion or poor terminal contact at sensor or BCM
  • Wiring harness chafe causing intermittent short to ground or open circuit
  • Power/ground fault (fuse, splice, or body ground)
  • Module communication or configuration error after service/replace

Fault status

⚠️ Status
Glass break sensor circuit malfunction detected. The body control module has logged a failure in the glass break sensor input—this may disable glass-break alarm detection or cause false alarms until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B1232 B1234 B1250 B1210 U0140
290

Browse 290 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

B1233

MERCEDES-BENZ B — Body

Refrigerant temperature sensor (B12/1)

Brand: MERCEDES-BENZ
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or degraded glass break sensor (piezo or microphone element)
  • Open, short or intermittent wiring between sensor and control module
  • Corroded or loose connector(s)
  • Blown fuse or loss of sensor power/ground
  • Water ingress or physical damage to sensor
  • Faulty body control module (BCM) input or software fault

Symptoms

  • Alarm does not trigger when glass is struck or broken
  • False alarms or random alarm triggering
  • Warning light or message about intrusion/glass break sensor
  • Diagnostic trouble code B1233 stored; related security/BCM faults present
  • Glass break sensor indicator (if fitted) inactive or behaves abnormally

What to check

  • Read and record stored DTCs and freeze frame with a capable scan tool; check for related codes (BCM, CAN bus)
  • Visual inspection of glass break sensor location for physical damage or water ingress
  • Inspect connectors for corrosion, bent pins, or moisture; reseat connectors
  • Check relevant fuse(s) and fusible links for continuity
  • Verify battery voltage at key-on and sensor harness power pin (nominal ~11–14 V)
  • Measure continuity/ resistance of signal and ground circuits to the BCM

Signal parameters

  • Sensor power: nominal vehicle battery 12 V (expected ~11–14 V at key on/run)
  • Ground: low resistance path to chassis/BCM ground (
  • Sensor output: typically an analog pulse or voltage/frequency change on impact (idle ~small offset, event = transient pulse)
  • Expected event signal: short-duration pulses or high-frequency content when glass is struck (varies by sensor type)
  • Communications: BCM may report sensor status via CAN messages (glass_break_status / event_count)
  • Note: exact voltages/frequencies are manufacturer-specific; consult Land Rover technical data for precise values

Diagnostic algorithm

  1. Connect an appropriate diagnostic scan tool; record DTC B1233 and any related codes. Clear codes and attempt to reproduce.
  2. Inspect sensor and harness visually for damage, corrosion, moisture, or signs of recent glass replacement. Repair any obvious issues.
  3. Check fuses and power supply to sensor circuit. Repair/replace fuse if blown and investigate cause of failure.
  4. Backprobe power and ground pins at the sensor connector. Verify stable supply voltage and good ground with ignition on.
  5. With a scope or multimeter capable of capturing transients, monitor the sensor output while gently tapping the glass near the sensor to confirm output pulses. If no response, suspect sensor or wiring.
  6. Check continuity and resistance between the sensor output and the corresponding BCM input pin. Repair any opens or shorts.
  7. Inspect/repair any splices or harness sections routed through doors/pillars where chafe occurs. Replace damaged wiring as required.
  8. Verify BCM receives the sensor signal or CAN messages. If BCM does not see the input but wiring and sensor test good, consider BCM fault or reflash of module software.
  9. If wiring and module OK, replace sensor and retest. After replacement, perform any required calibration or teach-in procedure per Land Rover service manual.
  10. After repairs, clear codes and perform final verification: confirm alarm behavior and that DTC does not return during road/test environment.

Likely causes

  • Sensor element failure (most common)
  • Connector corrosion or poor terminal contact at sensor or BCM
  • Wiring harness chafe causing intermittent short to ground or open circuit
  • Power/ground fault (fuse, splice, or body ground)
  • Module communication or configuration error after service/replace

Fault status

⚠️ Status
Glass break sensor circuit malfunction detected. The body control module has logged a failure in the glass break sensor input—this may disable glass-break alarm detection or cause false alarms until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B1232 B1234 B1250 B1210 U0140
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1233

Other B — Body

Glass Break Sensor Failure

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or degraded glass break sensor (piezo or microphone element)
  • Open, short or intermittent wiring between sensor and control module
  • Corroded or loose connector(s)
  • Blown fuse or loss of sensor power/ground
  • Water ingress or physical damage to sensor
  • Faulty body control module (BCM) input or software fault

Symptoms

  • Alarm does not trigger when glass is struck or broken
  • False alarms or random alarm triggering
  • Warning light or message about intrusion/glass break sensor
  • Diagnostic trouble code B1233 stored; related security/BCM faults present
  • Glass break sensor indicator (if fitted) inactive or behaves abnormally

What to check

  • Read and record stored DTCs and freeze frame with a capable scan tool; check for related codes (BCM, CAN bus)
  • Visual inspection of glass break sensor location for physical damage or water ingress
  • Inspect connectors for corrosion, bent pins, or moisture; reseat connectors
  • Check relevant fuse(s) and fusible links for continuity
  • Verify battery voltage at key-on and sensor harness power pin (nominal ~11–14 V)
  • Measure continuity/ resistance of signal and ground circuits to the BCM

Signal parameters

  • Sensor power: nominal vehicle battery 12 V (expected ~11–14 V at key on/run)
  • Ground: low resistance path to chassis/BCM ground (
  • Sensor output: typically an analog pulse or voltage/frequency change on impact (idle ~small offset, event = transient pulse)
  • Expected event signal: short-duration pulses or high-frequency content when glass is struck (varies by sensor type)
  • Communications: BCM may report sensor status via CAN messages (glass_break_status / event_count)
  • Note: exact voltages/frequencies are manufacturer-specific; consult Land Rover technical data for precise values

Diagnostic algorithm

  1. Connect an appropriate diagnostic scan tool; record DTC B1233 and any related codes. Clear codes and attempt to reproduce.
  2. Inspect sensor and harness visually for damage, corrosion, moisture, or signs of recent glass replacement. Repair any obvious issues.
  3. Check fuses and power supply to sensor circuit. Repair/replace fuse if blown and investigate cause of failure.
  4. Backprobe power and ground pins at the sensor connector. Verify stable supply voltage and good ground with ignition on.
  5. With a scope or multimeter capable of capturing transients, monitor the sensor output while gently tapping the glass near the sensor to confirm output pulses. If no response, suspect sensor or wiring.
  6. Check continuity and resistance between the sensor output and the corresponding BCM input pin. Repair any opens or shorts.
  7. Inspect/repair any splices or harness sections routed through doors/pillars where chafe occurs. Replace damaged wiring as required.
  8. Verify BCM receives the sensor signal or CAN messages. If BCM does not see the input but wiring and sensor test good, consider BCM fault or reflash of module software.
  9. If wiring and module OK, replace sensor and retest. After replacement, perform any required calibration or teach-in procedure per Land Rover service manual.
  10. After repairs, clear codes and perform final verification: confirm alarm behavior and that DTC does not return during road/test environment.

Likely causes

  • Sensor element failure (most common)
  • Connector corrosion or poor terminal contact at sensor or BCM
  • Wiring harness chafe causing intermittent short to ground or open circuit
  • Power/ground fault (fuse, splice, or body ground)
  • Module communication or configuration error after service/replace

Fault status

⚠️ Status
Glass break sensor circuit malfunction detected. The body control module has logged a failure in the glass break sensor input—this may disable glass-break alarm detection or cause false alarms until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

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B1232 B1234 B1250 B1210 U0140
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