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Home / DTC / B2449 — Incandescent heater auxiliary bulb - ground short circuit

B2449 — Incandescent heater auxiliary bulb - ground short circuit

Detailed page for trouble code B2449.

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Code

B2449

LAND ROVER B — Body

Incandescent heater auxiliary bulb - ground short circuit

Brand: LAND ROVER
Type: B — Body
Views: UK: 13 EN: 22 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring harness contacting chassis metal
  • Corroded, bent or pushed-out lamp/socket connector pin
  • Failed incandescent bulb with shorted filament or internal short
  • Water ingress or contamination at lamp/connector causing bridging
  • Shorted ground-side driver inside body control module (BCM) or heater module
  • Poor or loose chassis ground or mounting point

Symptoms

  • Heater auxiliary lamp inoperative or stuck on
  • Related fuse(s) blown repeatedly or show signs of heat damage
  • DTC B2449 (ground short) stored and possible associated warnings on dash
  • Visible melted insulation, burnt smell or heat near harness/sockets
  • Intermittent operation when moving harness or connector

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Visually inspect lamp, lamp socket, connector and wiring for damage, corrosion, contamination or melted insulation
  • Check relevant fuses and fuse holders for blown fuse or heat damage
  • Inspect vehicle grounds and secure chassis ground points serving the heater/lighting circuit
  • Disconnect the lamp connector and test for short to chassis ground from the harness side
  • Bench-test the bulb on a known good 12 V supply to confirm lamp condition

Signal parameters

  • Battery voltage at lamp supply: ~12–14 V with ignition on
  • Expected lamp current (incandescent): typical range 0.1–2 A depending on bulb size; verify bulb specification
  • Measured resistance: bulb cold resistance typically low (a few ohms); harness conductor to chassis ground should show high resistance or open when connector disconnected
  • Short detection: continuity from harness ground wire to chassis ground present when it should be open (indicates short)

Diagnostic algorithm

  1. Retrieve and record codes, then clear them and attempt to re-create fault to confirm current status.
  2. Visually inspect the lamp, socket and wiring harness for damage, moisture, corrosion or melted insulation; repair or replace visibly damaged components.
  3. With ignition off, disconnect the lamp connector. Using a multimeter, check continuity between the lamp ground circuit pin and chassis ground — there should be no direct short when harness is disconnected from control module (open/high resistance).
  4. Bench test the removed bulb on a known-good 12 V source to confirm it is not internally shorted.
  5. If short present on harness side, isolate the harness by disconnecting intermediate connectors and sections to locate the shorted section; inspect grommets and routing where harness passes through body panels.
  6. If harness and lamp appear OK, check the ground driver in the BCM/heater module: measure resistance/voltage at the module output with appropriate live testing procedures or consult manufacturer service info. Avoid probing module pins without guidance.
  7. Repair or replace damaged wiring, connectors, grommets, lamp or module as indicated. Reassemble, clear codes and verify repair by cycling lamp operation and rescanning for stored codes.
  8. If intermittent, perform wiggle/road test and re-check connector retention and harness routing to prevent future chafing.

Likely causes

  • Chafed insulation where harness passes through body panels or heater housing
  • Corroded lamp socket or connector causing low-resistance path to ground
  • Internal short in the incandescent lamp (rare but possible)
  • Connector retained pin contacting bodywork (improper seating)

Fault status

⚠️ Status
Stored when the control module detects a short to chassis ground on the incandescent heater auxiliary bulb circuit (ground side fault). May be accompanied by blown fuses or loss of lamp function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2448 B2450 B2440 B2470
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

B2449

Other B — Body

Aux Heater Glow Plug Circuit Short to Ground

Brand: Other
Type: B — Body
Views: UK: 24 EN: 46 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring harness contacting chassis metal
  • Corroded, bent or pushed-out lamp/socket connector pin
  • Failed incandescent bulb with shorted filament or internal short
  • Water ingress or contamination at lamp/connector causing bridging
  • Shorted ground-side driver inside body control module (BCM) or heater module
  • Poor or loose chassis ground or mounting point

Symptoms

  • Heater auxiliary lamp inoperative or stuck on
  • Related fuse(s) blown repeatedly or show signs of heat damage
  • DTC B2449 (ground short) stored and possible associated warnings on dash
  • Visible melted insulation, burnt smell or heat near harness/sockets
  • Intermittent operation when moving harness or connector

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Visually inspect lamp, lamp socket, connector and wiring for damage, corrosion, contamination or melted insulation
  • Check relevant fuses and fuse holders for blown fuse or heat damage
  • Inspect vehicle grounds and secure chassis ground points serving the heater/lighting circuit
  • Disconnect the lamp connector and test for short to chassis ground from the harness side
  • Bench-test the bulb on a known good 12 V supply to confirm lamp condition

Signal parameters

  • Battery voltage at lamp supply: ~12–14 V with ignition on
  • Expected lamp current (incandescent): typical range 0.1–2 A depending on bulb size; verify bulb specification
  • Measured resistance: bulb cold resistance typically low (a few ohms); harness conductor to chassis ground should show high resistance or open when connector disconnected
  • Short detection: continuity from harness ground wire to chassis ground present when it should be open (indicates short)

Diagnostic algorithm

  1. Retrieve and record codes, then clear them and attempt to re-create fault to confirm current status.
  2. Visually inspect the lamp, socket and wiring harness for damage, moisture, corrosion or melted insulation; repair or replace visibly damaged components.
  3. With ignition off, disconnect the lamp connector. Using a multimeter, check continuity between the lamp ground circuit pin and chassis ground — there should be no direct short when harness is disconnected from control module (open/high resistance).
  4. Bench test the removed bulb on a known-good 12 V source to confirm it is not internally shorted.
  5. If short present on harness side, isolate the harness by disconnecting intermediate connectors and sections to locate the shorted section; inspect grommets and routing where harness passes through body panels.
  6. If harness and lamp appear OK, check the ground driver in the BCM/heater module: measure resistance/voltage at the module output with appropriate live testing procedures or consult manufacturer service info. Avoid probing module pins without guidance.
  7. Repair or replace damaged wiring, connectors, grommets, lamp or module as indicated. Reassemble, clear codes and verify repair by cycling lamp operation and rescanning for stored codes.
  8. If intermittent, perform wiggle/road test and re-check connector retention and harness routing to prevent future chafing.

Likely causes

  • Chafed insulation where harness passes through body panels or heater housing
  • Corroded lamp socket or connector causing low-resistance path to ground
  • Internal short in the incandescent lamp (rare but possible)
  • Connector retained pin contacting bodywork (improper seating)

Fault status

⚠️ Status
Stored when the control module detects a short to chassis ground on the incandescent heater auxiliary bulb circuit (ground side fault). May be accompanied by blown fuses or loss of lamp function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

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