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Home / DTC / B1510 — Hazard flasher switch circuit short to ground

B1510 — Hazard flasher switch circuit short to ground

Detailed page for trouble code B1510.

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22,491specific
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Code

B1510

ALFA ROMEO B — Body

Hazard flasher switch circuit short to ground

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

Causes

  • Damaged or chafed wiring contacting chassis ground
  • Corroded, bent or damaged connector pins at the hazard switch or BCM/relay module
  • Failed hazard flasher switch (internal short)
  • Faulty flasher/relay/module (internal short in output stage)
  • Aftermarket equipment or repair that spliced into the circuit incorrectly
  • Water ingress or corrosion in steering column or switch area

Symptoms

  • Hazard lights do not operate or operate intermittently
  • Turn signals may be affected or not function correctly
  • Blown fuse(s) on hazard/indicator circuit
  • Possible battery drain if short is permanent
  • Related warning lamp on dash or stored body module faults
  • Clicking/flasher noise absent when hazards selected

What to check

  • Retrieve freeze-frame data and confirm stored DTC and any related codes with a scan tool
  • Visual inspection of hazard switch, connectors, and wiring for damage, corrosion or pinching
  • Check relevant fuses and fuse holders for continuity and proper rating
  • Inspect for aftermarket taps or recent repairs in the dash/steering column area
  • Disconnect hazard switch connector and check if DTC clears or symptom changes (use caution)
  • Measure voltage at switch supply and output with a multimeter before and after disconnect

Signal parameters

  • Supply voltage at hazard switch supply pin: about battery voltage (12–14.5 V) with ignition ON
  • Output/switch pin when activated: pulsed between ~0 V and ~12 V (flashing duty) when functioning
  • Output/switch pin when OFF: open/high-impedance (no battery voltage; not shorted to ground)
  • Resistance from output pin to chassis ground: Open/very high resistance when circuit is healthy; near 0 Ω indicates a short to ground
  • Expected continuity: closed switch to module side only when switch actuated; otherwise no continuity to ground

Diagnostic algorithm

  1. Record the code and any related codes using a diagnostic scanner. Note vehicle conditions when code set.
  2. Visually inspect hazard switch, steering column area, instrument panel harness and relevant connectors for damage, corrosion or water ingress.
  3. Check relevant fuses for continuity and correct amperage. Replace blown fuses only after finding root cause of short.
  4. With ignition OFF, disconnect the hazard switch connector. Clear the code and then re-check by attempting to operate hazards and scanning for code return.
  5. If code does not return with switch disconnected, probe the switch wiring harness with a multimeter for short to ground: measure resistance from the suspect output wire(s) to chassis ground. Near 0 Ω indicates short.
  6. With ignition ON, backprobe the supply pin to confirm battery voltage. Backprobe output pin and operate hazard switch; a healthy circuit will show pulsed voltage when active. If output is held near 0 V (ground) regardless, suspect a short or failed switch/module.
  7. Isolate wiring by disconnecting connectors progressively (steering column, junction blocks, BCM) to locate the section with the short. Use continuity or voltage-drop tests while isolating.
  8. Inspect and repair any damaged wiring, pin repairs, or replace corroded connectors. If wiring is intact and short persists, bench-test or replace the hazard switch and/or flasher/body control module as per factory procedure.
  9. After repair, restore connectors, replace any fuses, clear codes, and verify proper hazard and turn-signal operation. Re-scan to confirm no reoccurrence.
  10. Advise retest drive/use and re-check for intermittent faults over time if repair was wiring-related.

Likely causes

  • Shorted or pinched wire in the steering column harness where the hazard switch wiring passes
  • Faulty hazard flasher switch with internal short to ground
  • Corroded/loose connector causing a grounded pin at the switch or control module
  • Short in wiring near connectors (e.g., behind dash) after recent work or component replacement

Fault status

⚠️ Status
Hazard flasher switch circuit shorted to ground detected; hazard lamps may be inoperative and related fuses may blow.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1511 B1512 B1570 B1200 U0121
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Code

B1510

FIAT B — Body

Hazard flasher switch circuit short to ground

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

Causes

  • Damaged or chafed wiring contacting chassis ground
  • Corroded, bent or damaged connector pins at the hazard switch or BCM/relay module
  • Failed hazard flasher switch (internal short)
  • Faulty flasher/relay/module (internal short in output stage)
  • Aftermarket equipment or repair that spliced into the circuit incorrectly
  • Water ingress or corrosion in steering column or switch area

Symptoms

  • Hazard lights do not operate or operate intermittently
  • Turn signals may be affected or not function correctly
  • Blown fuse(s) on hazard/indicator circuit
  • Possible battery drain if short is permanent
  • Related warning lamp on dash or stored body module faults
  • Clicking/flasher noise absent when hazards selected

What to check

  • Retrieve freeze-frame data and confirm stored DTC and any related codes with a scan tool
  • Visual inspection of hazard switch, connectors, and wiring for damage, corrosion or pinching
  • Check relevant fuses and fuse holders for continuity and proper rating
  • Inspect for aftermarket taps or recent repairs in the dash/steering column area
  • Disconnect hazard switch connector and check if DTC clears or symptom changes (use caution)
  • Measure voltage at switch supply and output with a multimeter before and after disconnect

Signal parameters

  • Supply voltage at hazard switch supply pin: about battery voltage (12–14.5 V) with ignition ON
  • Output/switch pin when activated: pulsed between ~0 V and ~12 V (flashing duty) when functioning
  • Output/switch pin when OFF: open/high-impedance (no battery voltage; not shorted to ground)
  • Resistance from output pin to chassis ground: Open/very high resistance when circuit is healthy; near 0 Ω indicates a short to ground
  • Expected continuity: closed switch to module side only when switch actuated; otherwise no continuity to ground

Diagnostic algorithm

  1. Record the code and any related codes using a diagnostic scanner. Note vehicle conditions when code set.
  2. Visually inspect hazard switch, steering column area, instrument panel harness and relevant connectors for damage, corrosion or water ingress.
  3. Check relevant fuses for continuity and correct amperage. Replace blown fuses only after finding root cause of short.
  4. With ignition OFF, disconnect the hazard switch connector. Clear the code and then re-check by attempting to operate hazards and scanning for code return.
  5. If code does not return with switch disconnected, probe the switch wiring harness with a multimeter for short to ground: measure resistance from the suspect output wire(s) to chassis ground. Near 0 Ω indicates short.
  6. With ignition ON, backprobe the supply pin to confirm battery voltage. Backprobe output pin and operate hazard switch; a healthy circuit will show pulsed voltage when active. If output is held near 0 V (ground) regardless, suspect a short or failed switch/module.
  7. Isolate wiring by disconnecting connectors progressively (steering column, junction blocks, BCM) to locate the section with the short. Use continuity or voltage-drop tests while isolating.
  8. Inspect and repair any damaged wiring, pin repairs, or replace corroded connectors. If wiring is intact and short persists, bench-test or replace the hazard switch and/or flasher/body control module as per factory procedure.
  9. After repair, restore connectors, replace any fuses, clear codes, and verify proper hazard and turn-signal operation. Re-scan to confirm no reoccurrence.
  10. Advise retest drive/use and re-check for intermittent faults over time if repair was wiring-related.

Likely causes

  • Shorted or pinched wire in the steering column harness where the hazard switch wiring passes
  • Faulty hazard flasher switch with internal short to ground
  • Corroded/loose connector causing a grounded pin at the switch or control module
  • Short in wiring near connectors (e.g., behind dash) after recent work or component replacement

Fault status

⚠️ Status
Hazard flasher switch circuit shorted to ground detected; hazard lamps may be inoperative and related fuses may blow.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1511 B1512 B1570 B1200 U0121
Repair manuals

Manual library for FIAT

26

Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

FIAT

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Code

B1510

MITSUBISHI B — Body

RL curtain ABG squib short

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

Causes

  • Damaged or chafed wiring contacting chassis ground
  • Corroded, bent or damaged connector pins at the hazard switch or BCM/relay module
  • Failed hazard flasher switch (internal short)
  • Faulty flasher/relay/module (internal short in output stage)
  • Aftermarket equipment or repair that spliced into the circuit incorrectly
  • Water ingress or corrosion in steering column or switch area

Symptoms

  • Hazard lights do not operate or operate intermittently
  • Turn signals may be affected or not function correctly
  • Blown fuse(s) on hazard/indicator circuit
  • Possible battery drain if short is permanent
  • Related warning lamp on dash or stored body module faults
  • Clicking/flasher noise absent when hazards selected

What to check

  • Retrieve freeze-frame data and confirm stored DTC and any related codes with a scan tool
  • Visual inspection of hazard switch, connectors, and wiring for damage, corrosion or pinching
  • Check relevant fuses and fuse holders for continuity and proper rating
  • Inspect for aftermarket taps or recent repairs in the dash/steering column area
  • Disconnect hazard switch connector and check if DTC clears or symptom changes (use caution)
  • Measure voltage at switch supply and output with a multimeter before and after disconnect

Signal parameters

  • Supply voltage at hazard switch supply pin: about battery voltage (12–14.5 V) with ignition ON
  • Output/switch pin when activated: pulsed between ~0 V and ~12 V (flashing duty) when functioning
  • Output/switch pin when OFF: open/high-impedance (no battery voltage; not shorted to ground)
  • Resistance from output pin to chassis ground: Open/very high resistance when circuit is healthy; near 0 Ω indicates a short to ground
  • Expected continuity: closed switch to module side only when switch actuated; otherwise no continuity to ground

Diagnostic algorithm

  1. Record the code and any related codes using a diagnostic scanner. Note vehicle conditions when code set.
  2. Visually inspect hazard switch, steering column area, instrument panel harness and relevant connectors for damage, corrosion or water ingress.
  3. Check relevant fuses for continuity and correct amperage. Replace blown fuses only after finding root cause of short.
  4. With ignition OFF, disconnect the hazard switch connector. Clear the code and then re-check by attempting to operate hazards and scanning for code return.
  5. If code does not return with switch disconnected, probe the switch wiring harness with a multimeter for short to ground: measure resistance from the suspect output wire(s) to chassis ground. Near 0 Ω indicates short.
  6. With ignition ON, backprobe the supply pin to confirm battery voltage. Backprobe output pin and operate hazard switch; a healthy circuit will show pulsed voltage when active. If output is held near 0 V (ground) regardless, suspect a short or failed switch/module.
  7. Isolate wiring by disconnecting connectors progressively (steering column, junction blocks, BCM) to locate the section with the short. Use continuity or voltage-drop tests while isolating.
  8. Inspect and repair any damaged wiring, pin repairs, or replace corroded connectors. If wiring is intact and short persists, bench-test or replace the hazard switch and/or flasher/body control module as per factory procedure.
  9. After repair, restore connectors, replace any fuses, clear codes, and verify proper hazard and turn-signal operation. Re-scan to confirm no reoccurrence.
  10. Advise retest drive/use and re-check for intermittent faults over time if repair was wiring-related.

Likely causes

  • Shorted or pinched wire in the steering column harness where the hazard switch wiring passes
  • Faulty hazard flasher switch with internal short to ground
  • Corroded/loose connector causing a grounded pin at the switch or control module
  • Short in wiring near connectors (e.g., behind dash) after recent work or component replacement

Fault status

⚠️ Status
Hazard flasher switch circuit shorted to ground detected; hazard lamps may be inoperative and related fuses may blow.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1511 B1512 B1570 B1200 U0121
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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

B1510

Other B — Body

Flash To Pass Switch Circuit Short To Ground

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

Causes

  • Damaged or chafed wiring contacting chassis ground
  • Corroded, bent or damaged connector pins at the hazard switch or BCM/relay module
  • Failed hazard flasher switch (internal short)
  • Faulty flasher/relay/module (internal short in output stage)
  • Aftermarket equipment or repair that spliced into the circuit incorrectly
  • Water ingress or corrosion in steering column or switch area

Symptoms

  • Hazard lights do not operate or operate intermittently
  • Turn signals may be affected or not function correctly
  • Blown fuse(s) on hazard/indicator circuit
  • Possible battery drain if short is permanent
  • Related warning lamp on dash or stored body module faults
  • Clicking/flasher noise absent when hazards selected

What to check

  • Retrieve freeze-frame data and confirm stored DTC and any related codes with a scan tool
  • Visual inspection of hazard switch, connectors, and wiring for damage, corrosion or pinching
  • Check relevant fuses and fuse holders for continuity and proper rating
  • Inspect for aftermarket taps or recent repairs in the dash/steering column area
  • Disconnect hazard switch connector and check if DTC clears or symptom changes (use caution)
  • Measure voltage at switch supply and output with a multimeter before and after disconnect

Signal parameters

  • Supply voltage at hazard switch supply pin: about battery voltage (12–14.5 V) with ignition ON
  • Output/switch pin when activated: pulsed between ~0 V and ~12 V (flashing duty) when functioning
  • Output/switch pin when OFF: open/high-impedance (no battery voltage; not shorted to ground)
  • Resistance from output pin to chassis ground: Open/very high resistance when circuit is healthy; near 0 Ω indicates a short to ground
  • Expected continuity: closed switch to module side only when switch actuated; otherwise no continuity to ground

Diagnostic algorithm

  1. Record the code and any related codes using a diagnostic scanner. Note vehicle conditions when code set.
  2. Visually inspect hazard switch, steering column area, instrument panel harness and relevant connectors for damage, corrosion or water ingress.
  3. Check relevant fuses for continuity and correct amperage. Replace blown fuses only after finding root cause of short.
  4. With ignition OFF, disconnect the hazard switch connector. Clear the code and then re-check by attempting to operate hazards and scanning for code return.
  5. If code does not return with switch disconnected, probe the switch wiring harness with a multimeter for short to ground: measure resistance from the suspect output wire(s) to chassis ground. Near 0 Ω indicates short.
  6. With ignition ON, backprobe the supply pin to confirm battery voltage. Backprobe output pin and operate hazard switch; a healthy circuit will show pulsed voltage when active. If output is held near 0 V (ground) regardless, suspect a short or failed switch/module.
  7. Isolate wiring by disconnecting connectors progressively (steering column, junction blocks, BCM) to locate the section with the short. Use continuity or voltage-drop tests while isolating.
  8. Inspect and repair any damaged wiring, pin repairs, or replace corroded connectors. If wiring is intact and short persists, bench-test or replace the hazard switch and/or flasher/body control module as per factory procedure.
  9. After repair, restore connectors, replace any fuses, clear codes, and verify proper hazard and turn-signal operation. Re-scan to confirm no reoccurrence.
  10. Advise retest drive/use and re-check for intermittent faults over time if repair was wiring-related.

Likely causes

  • Shorted or pinched wire in the steering column harness where the hazard switch wiring passes
  • Faulty hazard flasher switch with internal short to ground
  • Corroded/loose connector causing a grounded pin at the switch or control module
  • Short in wiring near connectors (e.g., behind dash) after recent work or component replacement

Fault status

⚠️ Status
Hazard flasher switch circuit shorted to ground detected; hazard lamps may be inoperative and related fuses may blow.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

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B1511 B1512 B1570 B1200 U0121
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