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Home / DTC / B1476 — Airbag malfunction indicator and warning lamp is defective

B1476 — Airbag malfunction indicator and warning lamp is defective

Detailed page for trouble code B1476.

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22,491specific
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Code

B1476

MERCEDES-BENZ B — Body

Airbag malfunction indicator and warning lamp is defective

Brand: MERCEDES-BENZ
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty instrument cluster lamp or LED board
  • Open/short or poor connection in lamp power or ground circuit
  • Blown fuse for instrument cluster or SRS lamp supply
  • SRS (airbag) control module lamp driver fault
  • Loss of communications (CAN/LIN) between SRS module and cluster
  • Software/configuration error in cluster or SRS module

Symptoms

  • No airbag lamp illumination during key‑on self test (lamp stays off)
  • Airbag lamp permanently lit or flickering intermittently
  • SRS-related fault(s) stored in airbag control module
  • Dash cluster may show other communication or instrument faults
  • Possible intermittent appearance/disappearance of the fault

What to check

  • Read stored codes and freeze/frame data from SRS (airbag) control module and instrument cluster with a capable scan tool
  • Visual inspection of instrument cluster area, connectors and wiring for damage, corrosion or loose pins
  • Check relevant fuses and power supply to instrument cluster and SRS module
  • Measure battery voltage and check for stable supply during key‑on
  • Measure voltage at the lamp/LED connector at key‑on self test and when commanded by a scan tool
  • Use an oscilloscope or CAN tester to verify CAN/LIN communication between cluster and SRS module

Signal parameters

  • Battery voltage at rest and key‑on: typically ~11–15 V
  • Lamp supply voltage at key‑on self test: near battery voltage when lamp is driven
  • Lamp continuity/ohms: incandescent bulbs low ohms (< 5–50 Ω) depending on lamp; LED circuits show low current (tens to hundreds of mA) and may measure differently
  • Ground continuity: close to 0 Ω between lamp ground and vehicle ground
  • CAN bus idle voltages: each CAN line ~2.5 V (recessive); differential ~0 V until active — verify proper frames with a CAN tool
  • LIN bus idle/logic levels depend on vehicle; verify with OEM data

Diagnostic algorithm

  1. Read codes from the SRS and instrument cluster; note current and historic faults and any communication errors.
  2. Confirm vehicle battery is charged and stable. If battery low or unstable, charge/retest before proceeding.
  3. Inspect fuses for instrument cluster and SRS; replace if blown and retest.
  4. Visually inspect instrument cluster connectors and wiring harness for damage, corrosion, bent pins or poor mating.
  5. With ignition ON (follow OEM SRS safety procedures), measure voltage at the airbag lamp connector on the cluster during key‑on self‑test and while commanding the lamp on/off with a scan tool. Compare to expected supply and ground.
  6. Use a scan tool to command the SRS lamp (if supported) and observe lamp response and any communication entries in the tool. If the cluster does not respond but SRS commands are sent, suspect cluster/driver fault.
  7. Check CAN/LIN communication between the instrument cluster and SRS module with a scope or CAN‑tool. If communications are lost, trace wiring and check termination and module wake‑up.
  8. If lamp supply and communications are good but lamp remains defective, remove cluster and inspect/replace the instrument cluster LED board or bulb assembly per OEM procedure.
  9. If lamp driver fault is indicated in the SRS module, consult OEM service info — reprogramming or replacement of the SRS module or cluster may be required.
  10. After repairs, clear codes and perform key‑on self test and a full scan to confirm the lamp now operates and no residual SRS faults remain.
  11. Safety note: Follow manufacturer SRS safety and immobilization procedures before disconnecting connectors or working near airbags. Disable power and follow OEM instructions to avoid accidental deployment.

Likely causes

  • Failed lamp/LED or connector at the instrument cluster
  • Poor ground or fused supply to the cluster lamp circuit
  • Corroded/loose connector between cluster and SRS module
  • SRS control module lamp driver fault or internal cluster electronics fault
  • CAN/LIN communication error preventing lamp command

Fault status

⚠️ Status
Airbag malfunction indicator / warning lamp defective — lamp or lamp circuit not functioning correctly (possible cluster lamp, wiring, fuse, SRS module driver or communication fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

B1476

MITSUBISHI B — Body

IG1(A) voltage extradinary low

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

Causes

  • Faulty instrument cluster lamp or LED board
  • Open/short or poor connection in lamp power or ground circuit
  • Blown fuse for instrument cluster or SRS lamp supply
  • SRS (airbag) control module lamp driver fault
  • Loss of communications (CAN/LIN) between SRS module and cluster
  • Software/configuration error in cluster or SRS module

Symptoms

  • No airbag lamp illumination during key‑on self test (lamp stays off)
  • Airbag lamp permanently lit or flickering intermittently
  • SRS-related fault(s) stored in airbag control module
  • Dash cluster may show other communication or instrument faults
  • Possible intermittent appearance/disappearance of the fault

What to check

  • Read stored codes and freeze/frame data from SRS (airbag) control module and instrument cluster with a capable scan tool
  • Visual inspection of instrument cluster area, connectors and wiring for damage, corrosion or loose pins
  • Check relevant fuses and power supply to instrument cluster and SRS module
  • Measure battery voltage and check for stable supply during key‑on
  • Measure voltage at the lamp/LED connector at key‑on self test and when commanded by a scan tool
  • Use an oscilloscope or CAN tester to verify CAN/LIN communication between cluster and SRS module

Signal parameters

  • Battery voltage at rest and key‑on: typically ~11–15 V
  • Lamp supply voltage at key‑on self test: near battery voltage when lamp is driven
  • Lamp continuity/ohms: incandescent bulbs low ohms (< 5–50 Ω) depending on lamp; LED circuits show low current (tens to hundreds of mA) and may measure differently
  • Ground continuity: close to 0 Ω between lamp ground and vehicle ground
  • CAN bus idle voltages: each CAN line ~2.5 V (recessive); differential ~0 V until active — verify proper frames with a CAN tool
  • LIN bus idle/logic levels depend on vehicle; verify with OEM data

Diagnostic algorithm

  1. Read codes from the SRS and instrument cluster; note current and historic faults and any communication errors.
  2. Confirm vehicle battery is charged and stable. If battery low or unstable, charge/retest before proceeding.
  3. Inspect fuses for instrument cluster and SRS; replace if blown and retest.
  4. Visually inspect instrument cluster connectors and wiring harness for damage, corrosion, bent pins or poor mating.
  5. With ignition ON (follow OEM SRS safety procedures), measure voltage at the airbag lamp connector on the cluster during key‑on self‑test and while commanding the lamp on/off with a scan tool. Compare to expected supply and ground.
  6. Use a scan tool to command the SRS lamp (if supported) and observe lamp response and any communication entries in the tool. If the cluster does not respond but SRS commands are sent, suspect cluster/driver fault.
  7. Check CAN/LIN communication between the instrument cluster and SRS module with a scope or CAN‑tool. If communications are lost, trace wiring and check termination and module wake‑up.
  8. If lamp supply and communications are good but lamp remains defective, remove cluster and inspect/replace the instrument cluster LED board or bulb assembly per OEM procedure.
  9. If lamp driver fault is indicated in the SRS module, consult OEM service info — reprogramming or replacement of the SRS module or cluster may be required.
  10. After repairs, clear codes and perform key‑on self test and a full scan to confirm the lamp now operates and no residual SRS faults remain.
  11. Safety note: Follow manufacturer SRS safety and immobilization procedures before disconnecting connectors or working near airbags. Disable power and follow OEM instructions to avoid accidental deployment.

Likely causes

  • Failed lamp/LED or connector at the instrument cluster
  • Poor ground or fused supply to the cluster lamp circuit
  • Corroded/loose connector between cluster and SRS module
  • SRS control module lamp driver fault or internal cluster electronics fault
  • CAN/LIN communication error preventing lamp command

Fault status

⚠️ Status
Airbag malfunction indicator / warning lamp defective — lamp or lamp circuit not functioning correctly (possible cluster lamp, wiring, fuse, SRS module driver or communication fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1475 B1460 U0121 U0073
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

B1476

Other B — Body

Wiper High Speed Circuit Motor Failure

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

Causes

  • Faulty instrument cluster lamp or LED board
  • Open/short or poor connection in lamp power or ground circuit
  • Blown fuse for instrument cluster or SRS lamp supply
  • SRS (airbag) control module lamp driver fault
  • Loss of communications (CAN/LIN) between SRS module and cluster
  • Software/configuration error in cluster or SRS module

Symptoms

  • No airbag lamp illumination during key‑on self test (lamp stays off)
  • Airbag lamp permanently lit or flickering intermittently
  • SRS-related fault(s) stored in airbag control module
  • Dash cluster may show other communication or instrument faults
  • Possible intermittent appearance/disappearance of the fault

What to check

  • Read stored codes and freeze/frame data from SRS (airbag) control module and instrument cluster with a capable scan tool
  • Visual inspection of instrument cluster area, connectors and wiring for damage, corrosion or loose pins
  • Check relevant fuses and power supply to instrument cluster and SRS module
  • Measure battery voltage and check for stable supply during key‑on
  • Measure voltage at the lamp/LED connector at key‑on self test and when commanded by a scan tool
  • Use an oscilloscope or CAN tester to verify CAN/LIN communication between cluster and SRS module

Signal parameters

  • Battery voltage at rest and key‑on: typically ~11–15 V
  • Lamp supply voltage at key‑on self test: near battery voltage when lamp is driven
  • Lamp continuity/ohms: incandescent bulbs low ohms (< 5–50 Ω) depending on lamp; LED circuits show low current (tens to hundreds of mA) and may measure differently
  • Ground continuity: close to 0 Ω between lamp ground and vehicle ground
  • CAN bus idle voltages: each CAN line ~2.5 V (recessive); differential ~0 V until active — verify proper frames with a CAN tool
  • LIN bus idle/logic levels depend on vehicle; verify with OEM data

Diagnostic algorithm

  1. Read codes from the SRS and instrument cluster; note current and historic faults and any communication errors.
  2. Confirm vehicle battery is charged and stable. If battery low or unstable, charge/retest before proceeding.
  3. Inspect fuses for instrument cluster and SRS; replace if blown and retest.
  4. Visually inspect instrument cluster connectors and wiring harness for damage, corrosion, bent pins or poor mating.
  5. With ignition ON (follow OEM SRS safety procedures), measure voltage at the airbag lamp connector on the cluster during key‑on self‑test and while commanding the lamp on/off with a scan tool. Compare to expected supply and ground.
  6. Use a scan tool to command the SRS lamp (if supported) and observe lamp response and any communication entries in the tool. If the cluster does not respond but SRS commands are sent, suspect cluster/driver fault.
  7. Check CAN/LIN communication between the instrument cluster and SRS module with a scope or CAN‑tool. If communications are lost, trace wiring and check termination and module wake‑up.
  8. If lamp supply and communications are good but lamp remains defective, remove cluster and inspect/replace the instrument cluster LED board or bulb assembly per OEM procedure.
  9. If lamp driver fault is indicated in the SRS module, consult OEM service info — reprogramming or replacement of the SRS module or cluster may be required.
  10. After repairs, clear codes and perform key‑on self test and a full scan to confirm the lamp now operates and no residual SRS faults remain.
  11. Safety note: Follow manufacturer SRS safety and immobilization procedures before disconnecting connectors or working near airbags. Disable power and follow OEM instructions to avoid accidental deployment.

Likely causes

  • Failed lamp/LED or connector at the instrument cluster
  • Poor ground or fused supply to the cluster lamp circuit
  • Corroded/loose connector between cluster and SRS module
  • SRS control module lamp driver fault or internal cluster electronics fault
  • CAN/LIN communication error preventing lamp command

Fault status

⚠️ Status
Airbag malfunction indicator / warning lamp defective — lamp or lamp circuit not functioning correctly (possible cluster lamp, wiring, fuse, SRS module driver or communication fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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