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Home / DTC / B1499 — Left turn indicator warning lamp

B1499 — Left turn indicator warning lamp

Detailed page for trouble code B1499.

34,405codes
59brands
11,914generic
22,491specific
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Code

B1499

ALFA ROMEO B — Body

Left turn indicator warning lamp

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

Causes

  • Burnt or failed left turn signal bulb or LED unit
  • Open or shorted wiring in left turn lamp circuit
  • Corroded or loose lamp socket or connector
  • Blown fuse for lighting or body module circuits
  • Faulty body control module (BCM) / instrument cluster output
  • Poor ground connection at lamp or module

Symptoms

  • Dashboard left turn indicator warning lamp illuminated or flashing steady
  • Left turn signal not operating or not visible externally
  • Left side turn lamp does not flash or flashes irregularly
  • Possible companion warnings or communication faults in scan tool
  • Hazard lights may behave abnormally

What to check

  • Read and record freeze-frame data and all related DTCs with a dealer-level scan tool
  • Visually inspect left turn lamp assembly, socket and connector for corrosion, damage or water
  • Check related fuses and relays for continuity and correct placement
  • Operate left turn and hazard switch while observing cluster and external lamp operation
  • Measure voltage at lamp socket with ignition on and while signaling (expect pulsed ~12 V)
  • Perform continuity and resistance checks from lamp socket to BCM/ground

Signal parameters

  • Supply voltage at lamp socket: ~11–14 V with ignition on (pulsed during flashing)
  • Flash rate: typically 60–120 flashes per minute (≈1–2 Hz)
  • Current draw (typical filament bulb): ~0.5–2 A per lamp; LED values lower (refer to vehicle spec)
  • Expected continuity: low resistance between lamp positive terminal and module output when circuit intact
  • Ground resistance: near 0 Ω between lamp ground and chassis ground

Diagnostic algorithm

  1. Retrieve and record all DTCs and live data. Note any communication (U-code) faults. Clear codes and re-test to confirm repeatability.
  2. Perform a visual inspection of left turn lamp, bulb/LED, lens, socket and connector. Replace bulb or LED module if visibly damaged.
  3. Check fuses related to exterior lighting and BCM; replace if blown and retest.
  4. With ignition on, measure voltage at the lamp positive terminal while activating left turn and hazard. Confirm pulsed voltage present.
  5. If no voltage at socket, trace from socket back to BCM: check continuity and look for open/short conditions and damaged insulation.
  6. Verify good ground at lamp: measure resistance to chassis ground. Repair any poor ground connections.
  7. If wiring and lamp check good, use a diagnostic tool to command the turn signal output from the BCM/instrument cluster and observe response. If module does not command output, suspect BCM/cluster.
  8. Inspect for water intrusion or corrosion in harness or lamp body; repair or replace affected components.
  9. If module suspected, verify CAN/communication integrity, reprogram or replace module only after verifying wiring and power/ground are correct.
  10. After repairs, erase codes and verify correct operation over test drive and repeated actuations.

Likely causes

  • Failed bulb/LED in left turn lamp
  • Corroded/loose connector or poor ground on left lamp
  • Open/short in left turn signal wiring harness
  • Faulty BCM or instrument cluster driving the indicator
  • Intermittent CAN/communication error preventing status reporting

Fault status

⚠️ Status
Left turn indicator warning lamp circuit fault detected — check left lamp (bulb/LED), wiring/connectors, fuses and body control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B1498 B1210 U0073 U0100 B1000
89

Browse 89 ALFA ROMEO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

ALFA ROMEO

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Code

B1499

FIAT B — Body

Left turn indicator warning lamp

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

Causes

  • Burnt or failed left turn signal bulb or LED unit
  • Open or shorted wiring in left turn lamp circuit
  • Corroded or loose lamp socket or connector
  • Blown fuse for lighting or body module circuits
  • Faulty body control module (BCM) / instrument cluster output
  • Poor ground connection at lamp or module

Symptoms

  • Dashboard left turn indicator warning lamp illuminated or flashing steady
  • Left turn signal not operating or not visible externally
  • Left side turn lamp does not flash or flashes irregularly
  • Possible companion warnings or communication faults in scan tool
  • Hazard lights may behave abnormally

What to check

  • Read and record freeze-frame data and all related DTCs with a dealer-level scan tool
  • Visually inspect left turn lamp assembly, socket and connector for corrosion, damage or water
  • Check related fuses and relays for continuity and correct placement
  • Operate left turn and hazard switch while observing cluster and external lamp operation
  • Measure voltage at lamp socket with ignition on and while signaling (expect pulsed ~12 V)
  • Perform continuity and resistance checks from lamp socket to BCM/ground

Signal parameters

  • Supply voltage at lamp socket: ~11–14 V with ignition on (pulsed during flashing)
  • Flash rate: typically 60–120 flashes per minute (≈1–2 Hz)
  • Current draw (typical filament bulb): ~0.5–2 A per lamp; LED values lower (refer to vehicle spec)
  • Expected continuity: low resistance between lamp positive terminal and module output when circuit intact
  • Ground resistance: near 0 Ω between lamp ground and chassis ground

Diagnostic algorithm

  1. Retrieve and record all DTCs and live data. Note any communication (U-code) faults. Clear codes and re-test to confirm repeatability.
  2. Perform a visual inspection of left turn lamp, bulb/LED, lens, socket and connector. Replace bulb or LED module if visibly damaged.
  3. Check fuses related to exterior lighting and BCM; replace if blown and retest.
  4. With ignition on, measure voltage at the lamp positive terminal while activating left turn and hazard. Confirm pulsed voltage present.
  5. If no voltage at socket, trace from socket back to BCM: check continuity and look for open/short conditions and damaged insulation.
  6. Verify good ground at lamp: measure resistance to chassis ground. Repair any poor ground connections.
  7. If wiring and lamp check good, use a diagnostic tool to command the turn signal output from the BCM/instrument cluster and observe response. If module does not command output, suspect BCM/cluster.
  8. Inspect for water intrusion or corrosion in harness or lamp body; repair or replace affected components.
  9. If module suspected, verify CAN/communication integrity, reprogram or replace module only after verifying wiring and power/ground are correct.
  10. After repairs, erase codes and verify correct operation over test drive and repeated actuations.

Likely causes

  • Failed bulb/LED in left turn lamp
  • Corroded/loose connector or poor ground on left lamp
  • Open/short in left turn signal wiring harness
  • Faulty BCM or instrument cluster driving the indicator
  • Intermittent CAN/communication error preventing status reporting

Fault status

⚠️ Status
Left turn indicator warning lamp circuit fault detected — check left lamp (bulb/LED), wiring/connectors, fuses and body control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B1498 B1210 U0073 U0100 B1000
Repair manuals

Manual library for FIAT

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Code

B1499

LAND ROVER B — Body

Left turn signal - failure of circuit Left turn signal bulb - open circuit left turn - short circuit to the battery

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

Causes

  • Burnt or failed left turn signal bulb or LED unit
  • Open or shorted wiring in left turn lamp circuit
  • Corroded or loose lamp socket or connector
  • Blown fuse for lighting or body module circuits
  • Faulty body control module (BCM) / instrument cluster output
  • Poor ground connection at lamp or module

Symptoms

  • Dashboard left turn indicator warning lamp illuminated or flashing steady
  • Left turn signal not operating or not visible externally
  • Left side turn lamp does not flash or flashes irregularly
  • Possible companion warnings or communication faults in scan tool
  • Hazard lights may behave abnormally

What to check

  • Read and record freeze-frame data and all related DTCs with a dealer-level scan tool
  • Visually inspect left turn lamp assembly, socket and connector for corrosion, damage or water
  • Check related fuses and relays for continuity and correct placement
  • Operate left turn and hazard switch while observing cluster and external lamp operation
  • Measure voltage at lamp socket with ignition on and while signaling (expect pulsed ~12 V)
  • Perform continuity and resistance checks from lamp socket to BCM/ground

Signal parameters

  • Supply voltage at lamp socket: ~11–14 V with ignition on (pulsed during flashing)
  • Flash rate: typically 60–120 flashes per minute (≈1–2 Hz)
  • Current draw (typical filament bulb): ~0.5–2 A per lamp; LED values lower (refer to vehicle spec)
  • Expected continuity: low resistance between lamp positive terminal and module output when circuit intact
  • Ground resistance: near 0 Ω between lamp ground and chassis ground

Diagnostic algorithm

  1. Retrieve and record all DTCs and live data. Note any communication (U-code) faults. Clear codes and re-test to confirm repeatability.
  2. Perform a visual inspection of left turn lamp, bulb/LED, lens, socket and connector. Replace bulb or LED module if visibly damaged.
  3. Check fuses related to exterior lighting and BCM; replace if blown and retest.
  4. With ignition on, measure voltage at the lamp positive terminal while activating left turn and hazard. Confirm pulsed voltage present.
  5. If no voltage at socket, trace from socket back to BCM: check continuity and look for open/short conditions and damaged insulation.
  6. Verify good ground at lamp: measure resistance to chassis ground. Repair any poor ground connections.
  7. If wiring and lamp check good, use a diagnostic tool to command the turn signal output from the BCM/instrument cluster and observe response. If module does not command output, suspect BCM/cluster.
  8. Inspect for water intrusion or corrosion in harness or lamp body; repair or replace affected components.
  9. If module suspected, verify CAN/communication integrity, reprogram or replace module only after verifying wiring and power/ground are correct.
  10. After repairs, erase codes and verify correct operation over test drive and repeated actuations.

Likely causes

  • Failed bulb/LED in left turn lamp
  • Corroded/loose connector or poor ground on left lamp
  • Open/short in left turn signal wiring harness
  • Faulty BCM or instrument cluster driving the indicator
  • Intermittent CAN/communication error preventing status reporting

Fault status

⚠️ Status
Left turn indicator warning lamp circuit fault detected — check left lamp (bulb/LED), wiring/connectors, fuses and body control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B1498 B1210 U0073 U0100 B1000
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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

B1499

MITSUBISHI B — Body

Control unit collision decision

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

Causes

  • Burnt or failed left turn signal bulb or LED unit
  • Open or shorted wiring in left turn lamp circuit
  • Corroded or loose lamp socket or connector
  • Blown fuse for lighting or body module circuits
  • Faulty body control module (BCM) / instrument cluster output
  • Poor ground connection at lamp or module

Symptoms

  • Dashboard left turn indicator warning lamp illuminated or flashing steady
  • Left turn signal not operating or not visible externally
  • Left side turn lamp does not flash or flashes irregularly
  • Possible companion warnings or communication faults in scan tool
  • Hazard lights may behave abnormally

What to check

  • Read and record freeze-frame data and all related DTCs with a dealer-level scan tool
  • Visually inspect left turn lamp assembly, socket and connector for corrosion, damage or water
  • Check related fuses and relays for continuity and correct placement
  • Operate left turn and hazard switch while observing cluster and external lamp operation
  • Measure voltage at lamp socket with ignition on and while signaling (expect pulsed ~12 V)
  • Perform continuity and resistance checks from lamp socket to BCM/ground

Signal parameters

  • Supply voltage at lamp socket: ~11–14 V with ignition on (pulsed during flashing)
  • Flash rate: typically 60–120 flashes per minute (≈1–2 Hz)
  • Current draw (typical filament bulb): ~0.5–2 A per lamp; LED values lower (refer to vehicle spec)
  • Expected continuity: low resistance between lamp positive terminal and module output when circuit intact
  • Ground resistance: near 0 Ω between lamp ground and chassis ground

Diagnostic algorithm

  1. Retrieve and record all DTCs and live data. Note any communication (U-code) faults. Clear codes and re-test to confirm repeatability.
  2. Perform a visual inspection of left turn lamp, bulb/LED, lens, socket and connector. Replace bulb or LED module if visibly damaged.
  3. Check fuses related to exterior lighting and BCM; replace if blown and retest.
  4. With ignition on, measure voltage at the lamp positive terminal while activating left turn and hazard. Confirm pulsed voltage present.
  5. If no voltage at socket, trace from socket back to BCM: check continuity and look for open/short conditions and damaged insulation.
  6. Verify good ground at lamp: measure resistance to chassis ground. Repair any poor ground connections.
  7. If wiring and lamp check good, use a diagnostic tool to command the turn signal output from the BCM/instrument cluster and observe response. If module does not command output, suspect BCM/cluster.
  8. Inspect for water intrusion or corrosion in harness or lamp body; repair or replace affected components.
  9. If module suspected, verify CAN/communication integrity, reprogram or replace module only after verifying wiring and power/ground are correct.
  10. After repairs, erase codes and verify correct operation over test drive and repeated actuations.

Likely causes

  • Failed bulb/LED in left turn lamp
  • Corroded/loose connector or poor ground on left lamp
  • Open/short in left turn signal wiring harness
  • Faulty BCM or instrument cluster driving the indicator
  • Intermittent CAN/communication error preventing status reporting

Fault status

⚠️ Status
Left turn indicator warning lamp circuit fault detected — check left lamp (bulb/LED), wiring/connectors, fuses and body control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B1498 B1210 U0073 U0100 B1000
406

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

MITSUBISHI

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

B1499

Other B — Body

Lamp Turn Signal Left Circuit Failure

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

Causes

  • Burnt or failed left turn signal bulb or LED unit
  • Open or shorted wiring in left turn lamp circuit
  • Corroded or loose lamp socket or connector
  • Blown fuse for lighting or body module circuits
  • Faulty body control module (BCM) / instrument cluster output
  • Poor ground connection at lamp or module

Symptoms

  • Dashboard left turn indicator warning lamp illuminated or flashing steady
  • Left turn signal not operating or not visible externally
  • Left side turn lamp does not flash or flashes irregularly
  • Possible companion warnings or communication faults in scan tool
  • Hazard lights may behave abnormally

What to check

  • Read and record freeze-frame data and all related DTCs with a dealer-level scan tool
  • Visually inspect left turn lamp assembly, socket and connector for corrosion, damage or water
  • Check related fuses and relays for continuity and correct placement
  • Operate left turn and hazard switch while observing cluster and external lamp operation
  • Measure voltage at lamp socket with ignition on and while signaling (expect pulsed ~12 V)
  • Perform continuity and resistance checks from lamp socket to BCM/ground

Signal parameters

  • Supply voltage at lamp socket: ~11–14 V with ignition on (pulsed during flashing)
  • Flash rate: typically 60–120 flashes per minute (≈1–2 Hz)
  • Current draw (typical filament bulb): ~0.5–2 A per lamp; LED values lower (refer to vehicle spec)
  • Expected continuity: low resistance between lamp positive terminal and module output when circuit intact
  • Ground resistance: near 0 Ω between lamp ground and chassis ground

Diagnostic algorithm

  1. Retrieve and record all DTCs and live data. Note any communication (U-code) faults. Clear codes and re-test to confirm repeatability.
  2. Perform a visual inspection of left turn lamp, bulb/LED, lens, socket and connector. Replace bulb or LED module if visibly damaged.
  3. Check fuses related to exterior lighting and BCM; replace if blown and retest.
  4. With ignition on, measure voltage at the lamp positive terminal while activating left turn and hazard. Confirm pulsed voltage present.
  5. If no voltage at socket, trace from socket back to BCM: check continuity and look for open/short conditions and damaged insulation.
  6. Verify good ground at lamp: measure resistance to chassis ground. Repair any poor ground connections.
  7. If wiring and lamp check good, use a diagnostic tool to command the turn signal output from the BCM/instrument cluster and observe response. If module does not command output, suspect BCM/cluster.
  8. Inspect for water intrusion or corrosion in harness or lamp body; repair or replace affected components.
  9. If module suspected, verify CAN/communication integrity, reprogram or replace module only after verifying wiring and power/ground are correct.
  10. After repairs, erase codes and verify correct operation over test drive and repeated actuations.

Likely causes

  • Failed bulb/LED in left turn lamp
  • Corroded/loose connector or poor ground on left lamp
  • Open/short in left turn signal wiring harness
  • Faulty BCM or instrument cluster driving the indicator
  • Intermittent CAN/communication error preventing status reporting

Fault status

⚠️ Status
Left turn indicator warning lamp circuit fault detected — check left lamp (bulb/LED), wiring/connectors, fuses and body control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B1498 B1210 U0073 U0100 B1000
9,436

The library contains 9,436 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

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138
HYUNDAI
371
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LAND ROVER
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LEXUS
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LINCOLN
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VOLVO
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