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Home / DTC / B1891 — Airbag Circuit Indicator Warning - Battery Short Circuit

B1891 — Airbag Circuit Indicator Warning - Battery Short Circuit

Detailed page for trouble code B1891.

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Code

B1891

LAND ROVER B — Body

Airbag Circuit Indicator Warning - Battery Short Circuit

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

Causes

  • Short circuit of the airbag indicator lamp feed to battery positive
  • Damaged or chafed wiring harness near instrument cluster or SRS control module
  • Corroded, bent or bridged connector pins at the SRS module or instrument cluster
  • Faulty instrument cluster or airbag indicator lamp driver
  • Faulty airbag (SRS) control module
  • Aftermarket electrical accessories incorrectly connected to the instrument cluster power

Symptoms

  • SRS/Airbag warning lamp illuminated continuously or intermittently
  • Other SRS warnings or diagnostic trouble codes stored
  • Possible disablement of airbag deployment or seatbelt pretensioners (module may enter fail-safe)
  • Chimes or multiple warning lights on instrument cluster
  • Codes return after clearing

What to check

  • Retrieve full SRS code list and freeze-frame data with a manufacturer-capable scan tool
  • Visually inspect battery terminals, engine bay fuses and power distribution for signs of shorts or modifications
  • Inspect instrument cluster and SRS module connectors for corrosion, bent pins, melting or contamination
  • Inspect wiring harness routing between instrument cluster and SRS control module for chafing or contact with sharp edges
  • Back-probe the indicator lamp feed and ground with ignition on to verify voltage behavior
  • Check for aftermarket accessories or recent repairs that may have tapped cluster power

Signal parameters

  • Battery nominal voltage with ignition on: ~11–14 V
  • SRS indicator circuit behavior: momentary illumination at key-on self-test then extinguishes in a healthy circuit
  • Shorted condition: sustained near-battery voltage on indicator feed when lamp should be off
  • Open/normal lamp circuit: no sustained battery feed (high resistance) when self-test completes
  • Lamp driver current: typically small (tens of mA) during test; sustained high current indicates a short or driver fault

Diagnostic algorithm

  1. Safety first: follow manufacturer procedure to disable SRS power before any connector or wiring work — disconnect the battery and wait the manufacturer-specified time.
  2. Connect a diagnostic scanner capable of reading Land Rover SRS modules. Record all SRS codes and freeze-frame data, then clear codes and attempt to reproduce.
  3. Perform a visual inspection of instrument cluster, dash harness, and SRS module connectors for damage, corrosion or water ingress.
  4. Check for aftermarket accessories or recent wiring repairs that could be backfeeding the cluster; remove or isolate them.
  5. With ignition ON (and battery connected), back-probe the indicator feed at the instrument cluster and at the SRS module connector. Compare voltages and note where the sustained battery voltage first appears.
  6. If sustained battery voltage is present at the cluster but not at the module (or vice versa), isolate the wiring segment and perform resistance/continuity tests to ground and battery positive to locate the short.
  7. Inspect and repair any damaged wiring or replace corroded connectors. Use wiring diagrams to verify correct pinouts before repair.
  8. If wiring and connectors are good, test or replace the instrument cluster (indicator driver) or the SRS control module only after confirming the root cause with measurements.
  9. After repairs, reconnect battery, clear codes, and run SRS self-tests with the scan tool. Verify that B1891 does not return and confirm normal lamp behavior during key-on self-test.

Likely causes

  • Shorted/bridged connector or wiring between instrument cluster and SRS control module
  • Faulty instrument cluster lamp driver forcing constant feed to indicator
  • Corrosion or pin damage at SRS module/instrument cluster connectors
  • Aftermarket device tied into cluster power causing backfeed

Fault status

⚠️ Status
Airbag indicator circuit detects a short to battery (positive) — SRS indicator lamp circuit fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B1890 B1892 B1000 B0020 B0051
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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Code

B1891

Other B — Body

Air Bag Tone Warning Indicator Circuit Short to Battery

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

Causes

  • Short circuit of the airbag indicator lamp feed to battery positive
  • Damaged or chafed wiring harness near instrument cluster or SRS control module
  • Corroded, bent or bridged connector pins at the SRS module or instrument cluster
  • Faulty instrument cluster or airbag indicator lamp driver
  • Faulty airbag (SRS) control module
  • Aftermarket electrical accessories incorrectly connected to the instrument cluster power

Symptoms

  • SRS/Airbag warning lamp illuminated continuously or intermittently
  • Other SRS warnings or diagnostic trouble codes stored
  • Possible disablement of airbag deployment or seatbelt pretensioners (module may enter fail-safe)
  • Chimes or multiple warning lights on instrument cluster
  • Codes return after clearing

What to check

  • Retrieve full SRS code list and freeze-frame data with a manufacturer-capable scan tool
  • Visually inspect battery terminals, engine bay fuses and power distribution for signs of shorts or modifications
  • Inspect instrument cluster and SRS module connectors for corrosion, bent pins, melting or contamination
  • Inspect wiring harness routing between instrument cluster and SRS control module for chafing or contact with sharp edges
  • Back-probe the indicator lamp feed and ground with ignition on to verify voltage behavior
  • Check for aftermarket accessories or recent repairs that may have tapped cluster power

Signal parameters

  • Battery nominal voltage with ignition on: ~11–14 V
  • SRS indicator circuit behavior: momentary illumination at key-on self-test then extinguishes in a healthy circuit
  • Shorted condition: sustained near-battery voltage on indicator feed when lamp should be off
  • Open/normal lamp circuit: no sustained battery feed (high resistance) when self-test completes
  • Lamp driver current: typically small (tens of mA) during test; sustained high current indicates a short or driver fault

Diagnostic algorithm

  1. Safety first: follow manufacturer procedure to disable SRS power before any connector or wiring work — disconnect the battery and wait the manufacturer-specified time.
  2. Connect a diagnostic scanner capable of reading Land Rover SRS modules. Record all SRS codes and freeze-frame data, then clear codes and attempt to reproduce.
  3. Perform a visual inspection of instrument cluster, dash harness, and SRS module connectors for damage, corrosion or water ingress.
  4. Check for aftermarket accessories or recent wiring repairs that could be backfeeding the cluster; remove or isolate them.
  5. With ignition ON (and battery connected), back-probe the indicator feed at the instrument cluster and at the SRS module connector. Compare voltages and note where the sustained battery voltage first appears.
  6. If sustained battery voltage is present at the cluster but not at the module (or vice versa), isolate the wiring segment and perform resistance/continuity tests to ground and battery positive to locate the short.
  7. Inspect and repair any damaged wiring or replace corroded connectors. Use wiring diagrams to verify correct pinouts before repair.
  8. If wiring and connectors are good, test or replace the instrument cluster (indicator driver) or the SRS control module only after confirming the root cause with measurements.
  9. After repairs, reconnect battery, clear codes, and run SRS self-tests with the scan tool. Verify that B1891 does not return and confirm normal lamp behavior during key-on self-test.

Likely causes

  • Shorted/bridged connector or wiring between instrument cluster and SRS control module
  • Faulty instrument cluster lamp driver forcing constant feed to indicator
  • Corrosion or pin damage at SRS module/instrument cluster connectors
  • Aftermarket device tied into cluster power causing backfeed

Fault status

⚠️ Status
Airbag indicator circuit detects a short to battery (positive) — SRS indicator lamp circuit fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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B1890 B1892 B1000 B0020 B0051
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