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Home / DTC / B2450 — Incandescent bulb of the auxiliary heater - open circuit

B2450 — Incandescent bulb of the auxiliary heater - open circuit

Detailed page for trouble code B2450.

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22,461specific
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Code

B2450

LAND ROVER B — Body

Incandescent bulb of the auxiliary heater - open circuit

Brand: LAND ROVER
Type: B — Body
Views: UK: 20 EN: 25 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown or broken incandescent bulb (filament open)
  • Disconnected, corroded or damaged lamp connector
  • Open or damaged wiring/harness between lamp and control module
  • Blown fuse protecting the auxiliary heater/lamp circuit
  • Poor ground connection for the lamp circuit
  • Faulty auxiliary-heater control module or driver (less common)

Symptoms

  • Auxiliary heater indicator / lamp fails to illuminate when auxiliary heater is selected or commanded
  • Possible auxiliary heater not functioning or not indicated as available
  • Related stored faults or limp behaviour of auxiliary heater system
  • Intermittent lamp operation if wiring/connector is marginal

What to check

  • Visual inspection of the bulb and lamp socket for broken filament, corrosion, melting or water entry
  • Inspect wiring harness and connector for damage, corrosion, pulled wires or poor pin fit
  • Check relevant fuses and replace if blown
  • Back-probe connector with lamp commanded ON and measure supply voltage
  • Measure continuity/resistance across lamp terminals with bulb removed (bench test)
  • Check ground continuity from lamp ground to chassis/ECU ground

Signal parameters

  • Supply voltage at lamp connector when lamp commanded: approximately vehicle battery voltage (≈12–14 V)
  • Filament continuity: closed circuit expected; cold filament resistance typically low (a few ohms to tens of ohms depending on lamp size)
  • No measurable continuity or infinite resistance indicates open circuit
  • Current draw when lamp powered: typically hundreds of mA up to a few amps depending on bulb type

Diagnostic algorithm

  1. Retrieve and record freeze-frame data and any additional related codes. Clear codes after repair verification. 2) Visually inspect lamp, socket and surrounding area for damage, corrosion, moisture or signs of overheating. 3) Remove lamp and perform a bench continuity/power test by applying 12 V to the bulb to confirm the bulb lights. Replace bulb if it fails. 4) With bulb removed, measure continuity between the lamp connector pins and the control module/ground as applicable. 5) Command the auxiliary heater (or lamp) ON while back-probing the connector and verify battery voltage is present at the supply terminal and a good ground at the ground terminal. 6) If voltage is absent, trace wiring back from the connector to the fuse and control module looking for open circuits, disconnected sections or repair splice failures. 7) Check/replace the fuse protecting the circuit if blown and retest. 8) If wiring and bulb are good but control module does not supply voltage or detect continuity, test/replace the auxiliary-heater control module or driver as per manufacturer procedures. 9) After repair, clear stored codes and perform a functional test of the auxiliary heater and lamp; confirm no return of the B2450 code.

Likely causes

  • Blown bulb or filament open
  • Loose or corroded lamp connector or socket
  • Open wiring due to chafing, pinched harness or connector damage
  • Blown fuse or poor ground connection

Fault status

⚠️ Status
Open circuit detected in auxiliary heater incandescent bulb circuit — lamp filament not detected or no supply/ground present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B2451 B2452 B2453 B1244
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

B2450

MITSUBISHI B — Body

Switch panel communication

Brand: MITSUBISHI
Type: B — Body
Views: UK: 22 EN: 32 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown or broken incandescent bulb (filament open)
  • Disconnected, corroded or damaged lamp connector
  • Open or damaged wiring/harness between lamp and control module
  • Blown fuse protecting the auxiliary heater/lamp circuit
  • Poor ground connection for the lamp circuit
  • Faulty auxiliary-heater control module or driver (less common)

Symptoms

  • Auxiliary heater indicator / lamp fails to illuminate when auxiliary heater is selected or commanded
  • Possible auxiliary heater not functioning or not indicated as available
  • Related stored faults or limp behaviour of auxiliary heater system
  • Intermittent lamp operation if wiring/connector is marginal

What to check

  • Visual inspection of the bulb and lamp socket for broken filament, corrosion, melting or water entry
  • Inspect wiring harness and connector for damage, corrosion, pulled wires or poor pin fit
  • Check relevant fuses and replace if blown
  • Back-probe connector with lamp commanded ON and measure supply voltage
  • Measure continuity/resistance across lamp terminals with bulb removed (bench test)
  • Check ground continuity from lamp ground to chassis/ECU ground

Signal parameters

  • Supply voltage at lamp connector when lamp commanded: approximately vehicle battery voltage (≈12–14 V)
  • Filament continuity: closed circuit expected; cold filament resistance typically low (a few ohms to tens of ohms depending on lamp size)
  • No measurable continuity or infinite resistance indicates open circuit
  • Current draw when lamp powered: typically hundreds of mA up to a few amps depending on bulb type

Diagnostic algorithm

  1. Retrieve and record freeze-frame data and any additional related codes. Clear codes after repair verification. 2) Visually inspect lamp, socket and surrounding area for damage, corrosion, moisture or signs of overheating. 3) Remove lamp and perform a bench continuity/power test by applying 12 V to the bulb to confirm the bulb lights. Replace bulb if it fails. 4) With bulb removed, measure continuity between the lamp connector pins and the control module/ground as applicable. 5) Command the auxiliary heater (or lamp) ON while back-probing the connector and verify battery voltage is present at the supply terminal and a good ground at the ground terminal. 6) If voltage is absent, trace wiring back from the connector to the fuse and control module looking for open circuits, disconnected sections or repair splice failures. 7) Check/replace the fuse protecting the circuit if blown and retest. 8) If wiring and bulb are good but control module does not supply voltage or detect continuity, test/replace the auxiliary-heater control module or driver as per manufacturer procedures. 9) After repair, clear stored codes and perform a functional test of the auxiliary heater and lamp; confirm no return of the B2450 code.

Likely causes

  • Blown bulb or filament open
  • Loose or corroded lamp connector or socket
  • Open wiring due to chafing, pinched harness or connector damage
  • Blown fuse or poor ground connection

Fault status

⚠️ Status
Open circuit detected in auxiliary heater incandescent bulb circuit — lamp filament not detected or no supply/ground present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B2451 B2452 B2453 B1244
406

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

MITSUBISHI

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Code

B2450

Other B — Body

Aux Heater Glow Plug Circuit Open

Brand: Other
Type: B — Body
Views: UK: 30 EN: 40 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown or broken incandescent bulb (filament open)
  • Disconnected, corroded or damaged lamp connector
  • Open or damaged wiring/harness between lamp and control module
  • Blown fuse protecting the auxiliary heater/lamp circuit
  • Poor ground connection for the lamp circuit
  • Faulty auxiliary-heater control module or driver (less common)

Symptoms

  • Auxiliary heater indicator / lamp fails to illuminate when auxiliary heater is selected or commanded
  • Possible auxiliary heater not functioning or not indicated as available
  • Related stored faults or limp behaviour of auxiliary heater system
  • Intermittent lamp operation if wiring/connector is marginal

What to check

  • Visual inspection of the bulb and lamp socket for broken filament, corrosion, melting or water entry
  • Inspect wiring harness and connector for damage, corrosion, pulled wires or poor pin fit
  • Check relevant fuses and replace if blown
  • Back-probe connector with lamp commanded ON and measure supply voltage
  • Measure continuity/resistance across lamp terminals with bulb removed (bench test)
  • Check ground continuity from lamp ground to chassis/ECU ground

Signal parameters

  • Supply voltage at lamp connector when lamp commanded: approximately vehicle battery voltage (≈12–14 V)
  • Filament continuity: closed circuit expected; cold filament resistance typically low (a few ohms to tens of ohms depending on lamp size)
  • No measurable continuity or infinite resistance indicates open circuit
  • Current draw when lamp powered: typically hundreds of mA up to a few amps depending on bulb type

Diagnostic algorithm

  1. Retrieve and record freeze-frame data and any additional related codes. Clear codes after repair verification. 2) Visually inspect lamp, socket and surrounding area for damage, corrosion, moisture or signs of overheating. 3) Remove lamp and perform a bench continuity/power test by applying 12 V to the bulb to confirm the bulb lights. Replace bulb if it fails. 4) With bulb removed, measure continuity between the lamp connector pins and the control module/ground as applicable. 5) Command the auxiliary heater (or lamp) ON while back-probing the connector and verify battery voltage is present at the supply terminal and a good ground at the ground terminal. 6) If voltage is absent, trace wiring back from the connector to the fuse and control module looking for open circuits, disconnected sections or repair splice failures. 7) Check/replace the fuse protecting the circuit if blown and retest. 8) If wiring and bulb are good but control module does not supply voltage or detect continuity, test/replace the auxiliary-heater control module or driver as per manufacturer procedures. 9) After repair, clear stored codes and perform a functional test of the auxiliary heater and lamp; confirm no return of the B2450 code.

Likely causes

  • Blown bulb or filament open
  • Loose or corroded lamp connector or socket
  • Open wiring due to chafing, pinched harness or connector damage
  • Blown fuse or poor ground connection

Fault status

⚠️ Status
Open circuit detected in auxiliary heater incandescent bulb circuit — lamp filament not detected or no supply/ground present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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