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Home / DTC / B1340 — Buzzer request input signal short to ground

B1340 — Buzzer request input signal short to ground

Detailed page for trouble code B1340.

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Code

B1340

ALFA ROMEO B — Body

Buzzer request input signal short to ground

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 4 EN: 6 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring harness shorting the buzzer request wire to chassis ground
  • Corroded or poorly connected connector pin grounding the signal
  • Aftermarket alarm, remote start, or audio accessory improperly wired to the buzzer circuit
  • Faulty buzzer/chime module or actuator with an internal short
  • Faulty BCM/instrument cluster output or internal short to ground

Symptoms

  • Constant or never-ending chime/buzzer (or no chime if module disabled)
  • Stored B1340 diagnostic trouble code in BCM/cluster
  • Intermittent or no audible warnings (locks, lights-on, seatbelt chime)
  • Possible battery drain if buzzer is stuck active
  • Related body electrical warning lights or malfunction messages

What to check

  • Scan vehicle and read code status, freeze frame, and related codes
  • Inspect wiring and connectors for the buzzer/chime circuit for damage, corrosion, or pin push-out
  • Backprobe the buzzer request input at the BCM/cluster connector with key ON and no request active
  • Measure resistance from the buzzer request pin to chassis ground with harness disconnected
  • Disconnect buzzer/chime (or aftermarket device) and re-check for code or signal change
  • Use an oscilloscope or DMM to look for steady 0V (short) versus pulsed request signal when chime is commanded

Signal parameters

  • Reference voltages vary by design; many systems use a pull-up to battery voltage and an active-low request.
  • Expected idle (no request): approximately battery voltage (≈10–15 V) at the request pin.
  • Expected active request: near 0 V (pulled to ground) or pulsed low depending on design.
  • Fault condition: continuous low (0–1 V) at the request pin when no buzzer request is present.
  • Line resistance: With harness disconnected, infinite/very high resistance to ground; a direct short typically shows

Diagnostic algorithm

  1. Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
  2. Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
  3. Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
  4. With ignition ON and no chime request, backprobe the request pin at the BCM/cluster and measure voltage. If ~0 V, suspect short to ground.
  5. Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
  6. If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
  7. If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
  8. If the short cannot be isolated in the harness, inspect/replace suspect connectors or repair damaged wiring. If wiring checks good, suspect BCM/cluster internal fault — confirm by bench testing or substituting a known-good module if available.
  9. After repair, clear codes and verify proper operation of chimes/buzzers and that code does not return during normal use.

Likely causes

  • Wiring damage at door hinge, harness grommet, or near connectors
  • Connector terminal pushed out, bent, or contaminated creating a ground
  • Aftermarket accessory tied into the wrong wire or poor install
  • Failed buzzer or speaker driver inside instrument cluster
  • BCM or cluster internal electronic fault (less common)

Fault status

⚠️ Status
B1340 — Buzzer request input signal short to ground detected by BCM/instrument cluster. Fault stored when request line is continuously low.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
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Code

B1340

FIAT B — Body

Buzzer request input signal short to ground

Brand: FIAT
Type: B — Body
Views: UK: 3 EN: 6 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring harness shorting the buzzer request wire to chassis ground
  • Corroded or poorly connected connector pin grounding the signal
  • Aftermarket alarm, remote start, or audio accessory improperly wired to the buzzer circuit
  • Faulty buzzer/chime module or actuator with an internal short
  • Faulty BCM/instrument cluster output or internal short to ground

Symptoms

  • Constant or never-ending chime/buzzer (or no chime if module disabled)
  • Stored B1340 diagnostic trouble code in BCM/cluster
  • Intermittent or no audible warnings (locks, lights-on, seatbelt chime)
  • Possible battery drain if buzzer is stuck active
  • Related body electrical warning lights or malfunction messages

What to check

  • Scan vehicle and read code status, freeze frame, and related codes
  • Inspect wiring and connectors for the buzzer/chime circuit for damage, corrosion, or pin push-out
  • Backprobe the buzzer request input at the BCM/cluster connector with key ON and no request active
  • Measure resistance from the buzzer request pin to chassis ground with harness disconnected
  • Disconnect buzzer/chime (or aftermarket device) and re-check for code or signal change
  • Use an oscilloscope or DMM to look for steady 0V (short) versus pulsed request signal when chime is commanded

Signal parameters

  • Reference voltages vary by design; many systems use a pull-up to battery voltage and an active-low request.
  • Expected idle (no request): approximately battery voltage (≈10–15 V) at the request pin.
  • Expected active request: near 0 V (pulled to ground) or pulsed low depending on design.
  • Fault condition: continuous low (0–1 V) at the request pin when no buzzer request is present.
  • Line resistance: With harness disconnected, infinite/very high resistance to ground; a direct short typically shows

Diagnostic algorithm

  1. Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
  2. Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
  3. Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
  4. With ignition ON and no chime request, backprobe the request pin at the BCM/cluster and measure voltage. If ~0 V, suspect short to ground.
  5. Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
  6. If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
  7. If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
  8. If the short cannot be isolated in the harness, inspect/replace suspect connectors or repair damaged wiring. If wiring checks good, suspect BCM/cluster internal fault — confirm by bench testing or substituting a known-good module if available.
  9. After repair, clear codes and verify proper operation of chimes/buzzers and that code does not return during normal use.

Likely causes

  • Wiring damage at door hinge, harness grommet, or near connectors
  • Connector terminal pushed out, bent, or contaminated creating a ground
  • Aftermarket accessory tied into the wrong wire or poor install
  • Failed buzzer or speaker driver inside instrument cluster
  • BCM or cluster internal electronic fault (less common)

Fault status

⚠️ Status
B1340 — Buzzer request input signal short to ground detected by BCM/instrument cluster. Fault stored when request line is continuously low.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
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Code

B1340

HUMMER B — Body

Air Mix Door One Movement Fault

Brand: HUMMER
Type: B — Body
Views: UK: 5 EN: 10 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring harness shorting the buzzer request wire to chassis ground
  • Corroded or poorly connected connector pin grounding the signal
  • Aftermarket alarm, remote start, or audio accessory improperly wired to the buzzer circuit
  • Faulty buzzer/chime module or actuator with an internal short
  • Faulty BCM/instrument cluster output or internal short to ground

Symptoms

  • Constant or never-ending chime/buzzer (or no chime if module disabled)
  • Stored B1340 diagnostic trouble code in BCM/cluster
  • Intermittent or no audible warnings (locks, lights-on, seatbelt chime)
  • Possible battery drain if buzzer is stuck active
  • Related body electrical warning lights or malfunction messages

What to check

  • Scan vehicle and read code status, freeze frame, and related codes
  • Inspect wiring and connectors for the buzzer/chime circuit for damage, corrosion, or pin push-out
  • Backprobe the buzzer request input at the BCM/cluster connector with key ON and no request active
  • Measure resistance from the buzzer request pin to chassis ground with harness disconnected
  • Disconnect buzzer/chime (or aftermarket device) and re-check for code or signal change
  • Use an oscilloscope or DMM to look for steady 0V (short) versus pulsed request signal when chime is commanded

Signal parameters

  • Reference voltages vary by design; many systems use a pull-up to battery voltage and an active-low request.
  • Expected idle (no request): approximately battery voltage (≈10–15 V) at the request pin.
  • Expected active request: near 0 V (pulled to ground) or pulsed low depending on design.
  • Fault condition: continuous low (0–1 V) at the request pin when no buzzer request is present.
  • Line resistance: With harness disconnected, infinite/very high resistance to ground; a direct short typically shows

Diagnostic algorithm

  1. Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
  2. Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
  3. Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
  4. With ignition ON and no chime request, backprobe the request pin at the BCM/cluster and measure voltage. If ~0 V, suspect short to ground.
  5. Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
  6. If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
  7. If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
  8. If the short cannot be isolated in the harness, inspect/replace suspect connectors or repair damaged wiring. If wiring checks good, suspect BCM/cluster internal fault — confirm by bench testing or substituting a known-good module if available.
  9. After repair, clear codes and verify proper operation of chimes/buzzers and that code does not return during normal use.

Likely causes

  • Wiring damage at door hinge, harness grommet, or near connectors
  • Connector terminal pushed out, bent, or contaminated creating a ground
  • Aftermarket accessory tied into the wrong wire or poor install
  • Failed buzzer or speaker driver inside instrument cluster
  • BCM or cluster internal electronic fault (less common)

Fault status

⚠️ Status
B1340 — Buzzer request input signal short to ground detected by BCM/instrument cluster. Fault stored when request line is continuously low.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1340

MITSUBISHI B — Body

EEPROM error

Brand: MITSUBISHI
Type: B — Body
Views: UK: 8 EN: 12 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring harness shorting the buzzer request wire to chassis ground
  • Corroded or poorly connected connector pin grounding the signal
  • Aftermarket alarm, remote start, or audio accessory improperly wired to the buzzer circuit
  • Faulty buzzer/chime module or actuator with an internal short
  • Faulty BCM/instrument cluster output or internal short to ground

Symptoms

  • Constant or never-ending chime/buzzer (or no chime if module disabled)
  • Stored B1340 diagnostic trouble code in BCM/cluster
  • Intermittent or no audible warnings (locks, lights-on, seatbelt chime)
  • Possible battery drain if buzzer is stuck active
  • Related body electrical warning lights or malfunction messages

What to check

  • Scan vehicle and read code status, freeze frame, and related codes
  • Inspect wiring and connectors for the buzzer/chime circuit for damage, corrosion, or pin push-out
  • Backprobe the buzzer request input at the BCM/cluster connector with key ON and no request active
  • Measure resistance from the buzzer request pin to chassis ground with harness disconnected
  • Disconnect buzzer/chime (or aftermarket device) and re-check for code or signal change
  • Use an oscilloscope or DMM to look for steady 0V (short) versus pulsed request signal when chime is commanded

Signal parameters

  • Reference voltages vary by design; many systems use a pull-up to battery voltage and an active-low request.
  • Expected idle (no request): approximately battery voltage (≈10–15 V) at the request pin.
  • Expected active request: near 0 V (pulled to ground) or pulsed low depending on design.
  • Fault condition: continuous low (0–1 V) at the request pin when no buzzer request is present.
  • Line resistance: With harness disconnected, infinite/very high resistance to ground; a direct short typically shows

Diagnostic algorithm

  1. Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
  2. Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
  3. Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
  4. With ignition ON and no chime request, backprobe the request pin at the BCM/cluster and measure voltage. If ~0 V, suspect short to ground.
  5. Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
  6. If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
  7. If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
  8. If the short cannot be isolated in the harness, inspect/replace suspect connectors or repair damaged wiring. If wiring checks good, suspect BCM/cluster internal fault — confirm by bench testing or substituting a known-good module if available.
  9. After repair, clear codes and verify proper operation of chimes/buzzers and that code does not return during normal use.

Likely causes

  • Wiring damage at door hinge, harness grommet, or near connectors
  • Connector terminal pushed out, bent, or contaminated creating a ground
  • Aftermarket accessory tied into the wrong wire or poor install
  • Failed buzzer or speaker driver inside instrument cluster
  • BCM or cluster internal electronic fault (less common)

Fault status

⚠️ Status
B1340 — Buzzer request input signal short to ground detected by BCM/instrument cluster. Fault stored when request line is continuously low.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1340

Other B — Body

Chime Input Request Circuit Short To Ground

Brand: Other
Type: B — Body
Views: UK: 18 EN: 27 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring harness shorting the buzzer request wire to chassis ground
  • Corroded or poorly connected connector pin grounding the signal
  • Aftermarket alarm, remote start, or audio accessory improperly wired to the buzzer circuit
  • Faulty buzzer/chime module or actuator with an internal short
  • Faulty BCM/instrument cluster output or internal short to ground

Symptoms

  • Constant or never-ending chime/buzzer (or no chime if module disabled)
  • Stored B1340 diagnostic trouble code in BCM/cluster
  • Intermittent or no audible warnings (locks, lights-on, seatbelt chime)
  • Possible battery drain if buzzer is stuck active
  • Related body electrical warning lights or malfunction messages

What to check

  • Scan vehicle and read code status, freeze frame, and related codes
  • Inspect wiring and connectors for the buzzer/chime circuit for damage, corrosion, or pin push-out
  • Backprobe the buzzer request input at the BCM/cluster connector with key ON and no request active
  • Measure resistance from the buzzer request pin to chassis ground with harness disconnected
  • Disconnect buzzer/chime (or aftermarket device) and re-check for code or signal change
  • Use an oscilloscope or DMM to look for steady 0V (short) versus pulsed request signal when chime is commanded

Signal parameters

  • Reference voltages vary by design; many systems use a pull-up to battery voltage and an active-low request.
  • Expected idle (no request): approximately battery voltage (≈10–15 V) at the request pin.
  • Expected active request: near 0 V (pulled to ground) or pulsed low depending on design.
  • Fault condition: continuous low (0–1 V) at the request pin when no buzzer request is present.
  • Line resistance: With harness disconnected, infinite/very high resistance to ground; a direct short typically shows

Diagnostic algorithm

  1. Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
  2. Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
  3. Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
  4. With ignition ON and no chime request, backprobe the request pin at the BCM/cluster and measure voltage. If ~0 V, suspect short to ground.
  5. Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
  6. If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
  7. If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
  8. If the short cannot be isolated in the harness, inspect/replace suspect connectors or repair damaged wiring. If wiring checks good, suspect BCM/cluster internal fault — confirm by bench testing or substituting a known-good module if available.
  9. After repair, clear codes and verify proper operation of chimes/buzzers and that code does not return during normal use.

Likely causes

  • Wiring damage at door hinge, harness grommet, or near connectors
  • Connector terminal pushed out, bent, or contaminated creating a ground
  • Aftermarket accessory tied into the wrong wire or poor install
  • Failed buzzer or speaker driver inside instrument cluster
  • BCM or cluster internal electronic fault (less common)

Fault status

⚠️ Status
B1340 — Buzzer request input signal short to ground detected by BCM/instrument cluster. Fault stored when request line is continuously low.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
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  • - Joining techniques
  • - Securing high-voltage battery and force progression
  • - Body assembly (doors, rear lid, panoramic sunroof)
  • - Dash panel and centre console
  • Power units
  • - Technical data: rear electric motor (VX90)
  • - Technical data: front electric motor (VX89)
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Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)

Workshop Manual
Years: 2018 Manual in English Pages: 645 14.8 MB
Short description

Workshop manual for the Audi Q8 (2018) — Electrical System. Includes technical data, safety notes and step‑by‑step repair procedures for battery/charging, starter/alternator, lighting, washer/wiper and wiring. Edition 05.2019.

Contents
Key sections:
  • 00 - Technical data
  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
  • 2.3 Contact corrosion
  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official 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.

Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop 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.

Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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