Code
B1299
ALFA ROMEO
B — Body
Volumetric anti-theft sensor supply short to ground
Views:
UK: 8
EN: 5
RU: 4
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness (supply conductor) shorted to chassis ground
- Corroded, bent or bridged terminals in the sensor connector
- Faulty volumetric sensor internal short to ground
- Water ingress or contamination in connector creating conductive path
- Aftermarket accessory or recent repair that disturbed alarm wiring
- Blown/layered insulation due to rubbing against metal or heat
Symptoms
- Interior motion sensor not working or falsely triggering alarm
- Alarm continuously active or will not arm
- Security warning lamp or message on dash
- Intermittent communications between alarm module and sensors
- Possible drain on battery if short present with ignition off
What to check
- Read and record freeze frame/fault history with diagnostic tool
- Visually inspect sensor, connector, and wiring for damage, corrosion, water or rodent chewing
- Check fuses related to the alarm/security circuit
- With ignition off, check for battery drain on alarm supply circuit
- Confirm fault persists with sensor disconnected (if allowed by vehicle procedure)
Signal parameters
- Sensor supply voltage (with alarm active/ignition as required): approximately 11–14 V at sensor supply pin
- If short to ground present: sensor supply may read close to 0 V or very low under load
- Resistance between supply conductor and chassis ground: normally high (kΩ); a short will show near 0 Ω
- Connector pin voltage should be stable; excessive voltage drop under small load indicates short/low impedance
Diagnostic algorithm
- Obtain vehicle-specific wiring diagram and security module pinout before probing.
- Clear code and attempt to reproduce. Note conditions when B1299 sets (ignition state, alarm arming).
- Visually inspect volumetric sensor, connector and harness route (look for chafe points, moisture, repairs, aftermarket devices).
- With ignition off and battery disconnected if required for safety, perform resistance check between sensor supply wire and chassis ground. Low resistance (~0 Ω) indicates a short.
- If short confirmed, disconnect volumetric sensor connector. Re-check resistance from supply circuit side of connector to ground. If short disappears, suspect sensor. If still present, suspect wiring downstream toward module.
- Backprobe supply circuit at convenient locations (using insulation piercer or harness access points) and trace toward alarm/control module to isolate location of short. Repair damaged wiring or connector as found.
- If wiring and connectors OK, bench-test or replace volumetric sensor per manufacturer procedure.
- After repair, clear codes, cycle ignition/arm alarm and verify proper operation. Monitor for recurrence and re-scan for stored/frozen faults.
Likely causes
- Wiring harness damaged at door pillar, roof liner or behind dashboard where sensor wiring runs
- Connector pins corroded or connector housing contaminated
- Volumetric sensor internal failure (shorted supply)
- Ground strap or body ground close to harness causing intermittent short
Fault status
Status
Volumetric anti-theft sensor supply circuit short to ground detected. Fault stored when the alarm/security module senses the sensor supply line at low potential or low resistance to chassis ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1299
FIAT
B — Body
Volumetric anti-theft sensor supply short to ground
Views:
UK: 8
EN: 6
RU: 5
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness (supply conductor) shorted to chassis ground
- Corroded, bent or bridged terminals in the sensor connector
- Faulty volumetric sensor internal short to ground
- Water ingress or contamination in connector creating conductive path
- Aftermarket accessory or recent repair that disturbed alarm wiring
- Blown/layered insulation due to rubbing against metal or heat
Symptoms
- Interior motion sensor not working or falsely triggering alarm
- Alarm continuously active or will not arm
- Security warning lamp or message on dash
- Intermittent communications between alarm module and sensors
- Possible drain on battery if short present with ignition off
What to check
- Read and record freeze frame/fault history with diagnostic tool
- Visually inspect sensor, connector, and wiring for damage, corrosion, water or rodent chewing
- Check fuses related to the alarm/security circuit
- With ignition off, check for battery drain on alarm supply circuit
- Confirm fault persists with sensor disconnected (if allowed by vehicle procedure)
Signal parameters
- Sensor supply voltage (with alarm active/ignition as required): approximately 11–14 V at sensor supply pin
- If short to ground present: sensor supply may read close to 0 V or very low under load
- Resistance between supply conductor and chassis ground: normally high (kΩ); a short will show near 0 Ω
- Connector pin voltage should be stable; excessive voltage drop under small load indicates short/low impedance
Diagnostic algorithm
- Obtain vehicle-specific wiring diagram and security module pinout before probing.
- Clear code and attempt to reproduce. Note conditions when B1299 sets (ignition state, alarm arming).
- Visually inspect volumetric sensor, connector and harness route (look for chafe points, moisture, repairs, aftermarket devices).
- With ignition off and battery disconnected if required for safety, perform resistance check between sensor supply wire and chassis ground. Low resistance (~0 Ω) indicates a short.
- If short confirmed, disconnect volumetric sensor connector. Re-check resistance from supply circuit side of connector to ground. If short disappears, suspect sensor. If still present, suspect wiring downstream toward module.
- Backprobe supply circuit at convenient locations (using insulation piercer or harness access points) and trace toward alarm/control module to isolate location of short. Repair damaged wiring or connector as found.
- If wiring and connectors OK, bench-test or replace volumetric sensor per manufacturer procedure.
- After repair, clear codes, cycle ignition/arm alarm and verify proper operation. Monitor for recurrence and re-scan for stored/frozen faults.
Likely causes
- Wiring harness damaged at door pillar, roof liner or behind dashboard where sensor wiring runs
- Connector pins corroded or connector housing contaminated
- Volumetric sensor internal failure (shorted supply)
- Ground strap or body ground close to harness causing intermittent short
Fault status
Status
Volumetric anti-theft sensor supply circuit short to ground detected. Fault stored when the alarm/security module senses the sensor supply line at low potential or low resistance to chassis ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
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Code
B1299
LAND ROVER
B — Body
Sensor in the power supply - short circuit to ground
Views:
UK: 9
EN: 10
RU: 6
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness (supply conductor) shorted to chassis ground
- Corroded, bent or bridged terminals in the sensor connector
- Faulty volumetric sensor internal short to ground
- Water ingress or contamination in connector creating conductive path
- Aftermarket accessory or recent repair that disturbed alarm wiring
- Blown/layered insulation due to rubbing against metal or heat
Symptoms
- Interior motion sensor not working or falsely triggering alarm
- Alarm continuously active or will not arm
- Security warning lamp or message on dash
- Intermittent communications between alarm module and sensors
- Possible drain on battery if short present with ignition off
What to check
- Read and record freeze frame/fault history with diagnostic tool
- Visually inspect sensor, connector, and wiring for damage, corrosion, water or rodent chewing
- Check fuses related to the alarm/security circuit
- With ignition off, check for battery drain on alarm supply circuit
- Confirm fault persists with sensor disconnected (if allowed by vehicle procedure)
Signal parameters
- Sensor supply voltage (with alarm active/ignition as required): approximately 11–14 V at sensor supply pin
- If short to ground present: sensor supply may read close to 0 V or very low under load
- Resistance between supply conductor and chassis ground: normally high (kΩ); a short will show near 0 Ω
- Connector pin voltage should be stable; excessive voltage drop under small load indicates short/low impedance
Diagnostic algorithm
- Obtain vehicle-specific wiring diagram and security module pinout before probing.
- Clear code and attempt to reproduce. Note conditions when B1299 sets (ignition state, alarm arming).
- Visually inspect volumetric sensor, connector and harness route (look for chafe points, moisture, repairs, aftermarket devices).
- With ignition off and battery disconnected if required for safety, perform resistance check between sensor supply wire and chassis ground. Low resistance (~0 Ω) indicates a short.
- If short confirmed, disconnect volumetric sensor connector. Re-check resistance from supply circuit side of connector to ground. If short disappears, suspect sensor. If still present, suspect wiring downstream toward module.
- Backprobe supply circuit at convenient locations (using insulation piercer or harness access points) and trace toward alarm/control module to isolate location of short. Repair damaged wiring or connector as found.
- If wiring and connectors OK, bench-test or replace volumetric sensor per manufacturer procedure.
- After repair, clear codes, cycle ignition/arm alarm and verify proper operation. Monitor for recurrence and re-scan for stored/frozen faults.
Likely causes
- Wiring harness damaged at door pillar, roof liner or behind dashboard where sensor wiring runs
- Connector pins corroded or connector housing contaminated
- Volumetric sensor internal failure (shorted supply)
- Ground strap or body ground close to harness causing intermittent short
Fault status
Status
Volumetric anti-theft sensor supply circuit short to ground detected. Fault stored when the alarm/security module senses the sensor supply line at low potential or low resistance to chassis ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
2
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualOfficial workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.
199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
199,00 UAH
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Was this AI description helpful?
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Code
B1299
Other
B — Body
Power Supply Sensor Circuit Short To Ground
Views:
UK: 19
EN: 22
RU: 20
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness (supply conductor) shorted to chassis ground
- Corroded, bent or bridged terminals in the sensor connector
- Faulty volumetric sensor internal short to ground
- Water ingress or contamination in connector creating conductive path
- Aftermarket accessory or recent repair that disturbed alarm wiring
- Blown/layered insulation due to rubbing against metal or heat
Symptoms
- Interior motion sensor not working or falsely triggering alarm
- Alarm continuously active or will not arm
- Security warning lamp or message on dash
- Intermittent communications between alarm module and sensors
- Possible drain on battery if short present with ignition off
What to check
- Read and record freeze frame/fault history with diagnostic tool
- Visually inspect sensor, connector, and wiring for damage, corrosion, water or rodent chewing
- Check fuses related to the alarm/security circuit
- With ignition off, check for battery drain on alarm supply circuit
- Confirm fault persists with sensor disconnected (if allowed by vehicle procedure)
Signal parameters
- Sensor supply voltage (with alarm active/ignition as required): approximately 11–14 V at sensor supply pin
- If short to ground present: sensor supply may read close to 0 V or very low under load
- Resistance between supply conductor and chassis ground: normally high (kΩ); a short will show near 0 Ω
- Connector pin voltage should be stable; excessive voltage drop under small load indicates short/low impedance
Diagnostic algorithm
- Obtain vehicle-specific wiring diagram and security module pinout before probing.
- Clear code and attempt to reproduce. Note conditions when B1299 sets (ignition state, alarm arming).
- Visually inspect volumetric sensor, connector and harness route (look for chafe points, moisture, repairs, aftermarket devices).
- With ignition off and battery disconnected if required for safety, perform resistance check between sensor supply wire and chassis ground. Low resistance (~0 Ω) indicates a short.
- If short confirmed, disconnect volumetric sensor connector. Re-check resistance from supply circuit side of connector to ground. If short disappears, suspect sensor. If still present, suspect wiring downstream toward module.
- Backprobe supply circuit at convenient locations (using insulation piercer or harness access points) and trace toward alarm/control module to isolate location of short. Repair damaged wiring or connector as found.
- If wiring and connectors OK, bench-test or replace volumetric sensor per manufacturer procedure.
- After repair, clear codes, cycle ignition/arm alarm and verify proper operation. Monitor for recurrence and re-scan for stored/frozen faults.
Likely causes
- Wiring harness damaged at door pillar, roof liner or behind dashboard where sensor wiring runs
- Connector pins corroded or connector housing contaminated
- Volumetric sensor internal failure (shorted supply)
- Ground strap or body ground close to harness causing intermittent short
Fault status
Status
Volumetric anti-theft sensor supply circuit short to ground detected. Fault stored when the alarm/security module senses the sensor supply line at low potential or low resistance to chassis ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
1
LAND ROVER 2
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualOfficial workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.
199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
199,00 UAH
Your experience will help others
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Was this AI description helpful?
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👎 Dislike
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