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Home / DTC / B2558 — Passenger Airbag on/off warning lamp Short or Short to Battery

B2558 — Passenger Airbag on/off warning lamp Short or Short to Battery

Detailed page for trouble code B2558.

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Code

B2558

HYUNDAI B — Body

Passenger Airbag on/off warning lamp Short or Short to Battery

Brand: HYUNDAI
Type: B — Body
Views: UK: 24 EN: 34 RU: 21
AI status
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Page language: EN

Causes

  • Damaged or chafed wiring harness (short to battery) on the passenger airbag ON/OFF lamp circuit
  • Corroded or loose connector at the instrument cluster or SRS (airbag) control module
  • Failed indicator lamp or lamp holder (cluster lamp/LED driver short)
  • Faulty SRS control module or instrument cluster driver circuit
  • Aftermarket accessory tied into dash power creating a backfeed
  • Moisture intrusion in connector or lamp assembly

Symptoms

  • Passenger airbag ON/OFF indicator lamp stuck ON, OFF, or flickering
  • SRS warning or other airbag-related indicator may illuminate
  • Passenger airbag enable/disable indicator not functioning correctly
  • Possible diagnostic trouble code stored and relevant lamp behavior unchanged after reset

What to check

  • Retrieve all SRS codes and freeze-frame data with a capable scan tool
  • Visual inspection of wiring and connectors for the passenger airbag indicator (under passenger dash and instrument cluster)
  • Check for aftermarket accessories or taps into dash power circuits
  • Inspect instrument cluster for signs of moisture or damage
  • Measure voltage at the indicator lamp connector with key ON to see if battery voltage is present or if the driver circuit is pulling to ground

Signal parameters

  • Control signal is binary: lamp circuit should be driven on/off by SRS or cluster (expected transitions between ~0 V and battery voltage when lit)
  • With lamp connected and commanded OFF, circuit should not be continuously at battery voltage (indicates short to B+)
  • Continuity: lamp filament/LED string normally shows finite resistance; short to battery will show low resistance to B+
  • Voltage at lamp connector (KOEO): ~0 V or battery voltage depending on lamp state — abnormal constant battery voltage suggests short to battery

Diagnostic algorithm

  1. Use an OBD/SRS scanner to confirm B2558 and note any related codes. Record conditions when code set.
  2. Visually inspect connectors and wiring for the passenger airbag ON/OFF indicator (instrument cluster, pin terminals, harness routing under right dash/passenger side).
  3. With ignition ON, measure voltage at the indicator lamp connector. Compare to expected on/off behavior. If constant battery voltage present when it should be off, suspect short to B+.
  4. Disconnect the indicator lamp or instrument cluster connector and check if the code clears or lamp behavior changes. If disconnecting stops the fault, isolate between disconnected connector and upstream harness.
  5. Perform continuity/short-to-B+ checks between the indicator circuit and battery positive with harness disconnected. Repair any chafed wires, pin shorts, or accessory taps.
  6. If wiring and connectors test OK, inspect/replace the instrument cluster lamp assembly or LED driver. If still present, consider SRS control module driver fault and consult manufacturer procedures before replacement.
  7. After repairs, clear codes and perform functional tests (power cycles, repeat conditions) to confirm fault does not return.

Likely causes

  • Wiring short to B+ on the passenger airbag ON/OFF lamp circuit (most common)
  • Bad connector pins or corrosion at the instrument cluster or SRS harness
  • Failed lamp/LED or cluster lighting driver
  • SRS control module output stage fault

Fault status

⚠️ Status
Passenger airbag ON/OFF indicator circuit short or short to battery detected. The airbag/passenger seat indicator lamp circuit shows a wiring or component fault causing abnormal voltage. Inspect wiring, connectors, lamp assembly, and related control modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

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371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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