Home / DTC / B1900 — Driver Belt Tower Vert Sensor Circuit Malfunction

B1900 — Driver Belt Tower Vert Sensor Circuit Malfunction

Detailed page for trouble code B1900.

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Code

B1900

HUMMER B — Body

Driver Belt Tower Vert Sensor Circuit Malfunction

Brand: HUMMER
Type: B — Body
Views: UK: 11 EN: 12 RU: 13
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded connector at the belt tower sensor
  • Broken, chafed, or pinched wiring (open or short to power/ground)
  • Failed belt tower vertical position sensor (potentiometer/position transducer)
  • Poor mating/seating of the connector or bent pins
  • Water intrusion or contamination at the sensor or connector
  • Faulty body/control module or intermittent module input

Symptoms

  • Illuminated SRS/airbag or body control warning lamp (if tied into restraint/seat systems)
  • Seat belt height adjustment may not function or read incorrectly
  • Service message on vehicle info display related to belt/seat system
  • Stored B1900 trouble code and possibly related codes
  • Intermittent fault that appears when moving the seat or door

What to check

  • Scan vehicle with a capable scan tool; record freeze frame and related codes
  • Inspect sensor connector and wiring harness at the belt tower and through the B‑pillar for damage, chafing, or corrosion
  • Visually inspect the sensor and mounting for physical damage or water intrusion
  • Backprobe the connector and check for proper reference voltage (usually 5 V) and ground at key ignition states
  • Monitor live data for the belt tower sensor while moving the height adjuster to note voltage/resistance changes
  • Perform wiggle test on harness and connector while monitoring live data for intermittent changes

Signal parameters

  • Typical position sensor is a variable voltage or potentiometer-style output — expect a changing signal between ~0.5 V and ~4.5 V across travel (center near 2.5 V)
  • Reference supply: approximately 5 V (vehicle dependent) on the sensor reference circuit
  • Signal circuit should not show continuity to ground or battery positive when disconnected (no short to power/ground)
  • Resistance between sensor signal and ground will vary with position; no open circuit

Diagnostic algorithm

  1. Connect a scan tool, read B1900 and related codes, note freeze frame and live data. 2) Visually inspect connector, wiring, and sensor at the driver belt tower and along harness routing through the B‑pillar and hinge area. 3) With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (≈5 V) and good ground. 4) Monitor signal voltage while moving the belt tower/height adjuster; confirm smooth, proportional change (no jumps or drops to 0 V). 5) If signal is absent or stuck, disconnect sensor and check for continuity to power/ground to determine short. 6) Perform a wiggle test of harness/connector while monitoring signal to reproduce intermittent faults; repair chafed wiring or broken conductors. 7) If wiring and connectors are good, replace the belt tower vertical position sensor and retest. 8) After repairs, clear codes, cycle ignition and operate system through full range; verify code does not return and sensor live data is within expected range. 9) If fault persists with good sensor and wiring, consider module input fault and consult wiring diagrams or dealer-level diagnostics.

Likely causes

  • Connector corrosion at the belt tower from door/seat movement
  • Harness abrasion where the wiring passes through the B-pillar or hinge area
  • Failed internal sensor potentiometer due to wear or impact
  • Connector not fully seated after service or aftermarket seat/trim work
  • Short to power caused by a nearby fastener or sharp edge

Fault status

⚠️ Status
B1900 — Driver Belt Tower Vertical Sensor Circuit Malfunction (open/short/out-of-range signal detected)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5–2.0 hours

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Code

B1900

MITSUBISHI B — Body

Rheostat line open

Brand: MITSUBISHI
Type: B — Body
Views: UK: 11 EN: 14 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded connector at the belt tower sensor
  • Broken, chafed, or pinched wiring (open or short to power/ground)
  • Failed belt tower vertical position sensor (potentiometer/position transducer)
  • Poor mating/seating of the connector or bent pins
  • Water intrusion or contamination at the sensor or connector
  • Faulty body/control module or intermittent module input

Symptoms

  • Illuminated SRS/airbag or body control warning lamp (if tied into restraint/seat systems)
  • Seat belt height adjustment may not function or read incorrectly
  • Service message on vehicle info display related to belt/seat system
  • Stored B1900 trouble code and possibly related codes
  • Intermittent fault that appears when moving the seat or door

What to check

  • Scan vehicle with a capable scan tool; record freeze frame and related codes
  • Inspect sensor connector and wiring harness at the belt tower and through the B‑pillar for damage, chafing, or corrosion
  • Visually inspect the sensor and mounting for physical damage or water intrusion
  • Backprobe the connector and check for proper reference voltage (usually 5 V) and ground at key ignition states
  • Monitor live data for the belt tower sensor while moving the height adjuster to note voltage/resistance changes
  • Perform wiggle test on harness and connector while monitoring live data for intermittent changes

Signal parameters

  • Typical position sensor is a variable voltage or potentiometer-style output — expect a changing signal between ~0.5 V and ~4.5 V across travel (center near 2.5 V)
  • Reference supply: approximately 5 V (vehicle dependent) on the sensor reference circuit
  • Signal circuit should not show continuity to ground or battery positive when disconnected (no short to power/ground)
  • Resistance between sensor signal and ground will vary with position; no open circuit

Diagnostic algorithm

  1. Connect a scan tool, read B1900 and related codes, note freeze frame and live data. 2) Visually inspect connector, wiring, and sensor at the driver belt tower and along harness routing through the B‑pillar and hinge area. 3) With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (≈5 V) and good ground. 4) Monitor signal voltage while moving the belt tower/height adjuster; confirm smooth, proportional change (no jumps or drops to 0 V). 5) If signal is absent or stuck, disconnect sensor and check for continuity to power/ground to determine short. 6) Perform a wiggle test of harness/connector while monitoring signal to reproduce intermittent faults; repair chafed wiring or broken conductors. 7) If wiring and connectors are good, replace the belt tower vertical position sensor and retest. 8) After repairs, clear codes, cycle ignition and operate system through full range; verify code does not return and sensor live data is within expected range. 9) If fault persists with good sensor and wiring, consider module input fault and consult wiring diagrams or dealer-level diagnostics.

Likely causes

  • Connector corrosion at the belt tower from door/seat movement
  • Harness abrasion where the wiring passes through the B-pillar or hinge area
  • Failed internal sensor potentiometer due to wear or impact
  • Connector not fully seated after service or aftermarket seat/trim work
  • Short to power caused by a nearby fastener or sharp edge

Fault status

⚠️ Status
B1900 — Driver Belt Tower Vertical Sensor Circuit Malfunction (open/short/out-of-range signal detected)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5–2.0 hours

Similar codes

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Code

B1900

Other B — Body

Driver Side Airbag Fault

Brand: Other
Type: B — Body
Views: UK: 16 EN: 29 RU: 31
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded connector at the belt tower sensor
  • Broken, chafed, or pinched wiring (open or short to power/ground)
  • Failed belt tower vertical position sensor (potentiometer/position transducer)
  • Poor mating/seating of the connector or bent pins
  • Water intrusion or contamination at the sensor or connector
  • Faulty body/control module or intermittent module input

Symptoms

  • Illuminated SRS/airbag or body control warning lamp (if tied into restraint/seat systems)
  • Seat belt height adjustment may not function or read incorrectly
  • Service message on vehicle info display related to belt/seat system
  • Stored B1900 trouble code and possibly related codes
  • Intermittent fault that appears when moving the seat or door

What to check

  • Scan vehicle with a capable scan tool; record freeze frame and related codes
  • Inspect sensor connector and wiring harness at the belt tower and through the B‑pillar for damage, chafing, or corrosion
  • Visually inspect the sensor and mounting for physical damage or water intrusion
  • Backprobe the connector and check for proper reference voltage (usually 5 V) and ground at key ignition states
  • Monitor live data for the belt tower sensor while moving the height adjuster to note voltage/resistance changes
  • Perform wiggle test on harness and connector while monitoring live data for intermittent changes

Signal parameters

  • Typical position sensor is a variable voltage or potentiometer-style output — expect a changing signal between ~0.5 V and ~4.5 V across travel (center near 2.5 V)
  • Reference supply: approximately 5 V (vehicle dependent) on the sensor reference circuit
  • Signal circuit should not show continuity to ground or battery positive when disconnected (no short to power/ground)
  • Resistance between sensor signal and ground will vary with position; no open circuit

Diagnostic algorithm

  1. Connect a scan tool, read B1900 and related codes, note freeze frame and live data. 2) Visually inspect connector, wiring, and sensor at the driver belt tower and along harness routing through the B‑pillar and hinge area. 3) With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (≈5 V) and good ground. 4) Monitor signal voltage while moving the belt tower/height adjuster; confirm smooth, proportional change (no jumps or drops to 0 V). 5) If signal is absent or stuck, disconnect sensor and check for continuity to power/ground to determine short. 6) Perform a wiggle test of harness/connector while monitoring signal to reproduce intermittent faults; repair chafed wiring or broken conductors. 7) If wiring and connectors are good, replace the belt tower vertical position sensor and retest. 8) After repairs, clear codes, cycle ignition and operate system through full range; verify code does not return and sensor live data is within expected range. 9) If fault persists with good sensor and wiring, consider module input fault and consult wiring diagrams or dealer-level diagnostics.

Likely causes

  • Connector corrosion at the belt tower from door/seat movement
  • Harness abrasion where the wiring passes through the B-pillar or hinge area
  • Failed internal sensor potentiometer due to wear or impact
  • Connector not fully seated after service or aftermarket seat/trim work
  • Short to power caused by a nearby fastener or sharp edge

Fault status

⚠️ Status
B1900 — Driver Belt Tower Vertical Sensor Circuit Malfunction (open/short/out-of-range signal detected)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5–2.0 hours

Similar codes

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