Code
B1340
ALFA ROMEO
B — Body
Buzzer request input signal short to ground
Views:
UK: 4
EN: 6
RU: 1
AI status
Completed
Completed
100%
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
- Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
- Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
- Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
- 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.
- Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
- If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
- If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
- 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.
- 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
Views:
UK: 3
EN: 6
RU: 3
AI status
Completed
Completed
100%
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
- Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
- Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
- Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
- 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.
- Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
- If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
- If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
- 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.
- 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
Views:
UK: 5
EN: 10
RU: 9
AI status
Completed
Completed
100%
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
- Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
- Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
- Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
- 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.
- Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
- If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
- If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
- 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.
- 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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Was this AI description helpful?
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Send to email
Code
B1340
MITSUBISHI
B — Body
EEPROM error
Views:
UK: 7
EN: 10
RU: 9
AI status
Completed
Completed
100%
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
- Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
- Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
- Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
- 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.
- Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
- If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
- If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
- 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.
- 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 :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
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Send to email
Code
B1340
Other
B — Body
Chime Input Request Circuit Short To Ground
Views:
UK: 18
EN: 27
RU: 23
AI status
Completed
Completed
100%
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
- Retrieve code(s) and note whether code is current or intermittent. Clear codes and attempt to reproduce.
- Obtain wiring diagram/pinout for buzzer request input, BCM/cluster connector location, and any intermediate connectors or splices.
- Visually inspect harness along routing (doors, dash, steering column, grommets) for chafing, rubbing, or damage.
- 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.
- Disconnect the buzzer/chime actuator and any aftermarket devices tied to the circuit. Re-check the request pin for return to normal voltage.
- If pin returns to normal with actuator disconnected, test and replace/repair the actuator or its connector/wiring.
- If pin remains low with actuator disconnected, isolate sections of harness: unplug intermediate connectors and measure continuity to ground to find the short location.
- 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.
- 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 :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
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0
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0
Send to email