Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B2471 — Interior Lamp Fault

B2471 — Interior Lamp Fault

Detailed page for trouble code B2471.

33,912codes
59brands
11,451generic
22,461specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B2471

HUMMER B — Body

Interior Lamp Fault

Brand: HUMMER
Type: B — Body
Views: UK: 24 EN: 32 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Burned-out or damaged interior lamp bulb(s)
  • Blown fuse or fusible link for interior lighting circuit
  • Poor or corroded ground/connector at lamp or harness
  • Open or shorted wiring (to ground or battery) in the lamp circuit
  • Faulty door ajar/switch or other input causing incorrect BCM lamp control
  • Faulty BCM or internal driver transistor

Symptoms

  • Interior/dome/map lamps do not illuminate when switched or when doors open
  • Interior lamps flicker or are intermittently functional
  • Interior lamps remain on and cause battery drain
  • Lamp behavior inconsistent with switch/dimmer settings
  • Related HVAC/display lighting may be affected (depending on vehicle wiring)
  • Stored B2471 code and possibly related body codes

What to check

  • Read and record freeze-frame and any related codes with a scan tool; attempt to recreate the fault
  • Visual inspection of lamp assemblies, sockets, connectors, and wiring for damage, corrosion, or water
  • Verify fuses and fusible links for the interior lighting circuit
  • Inspect and test door ajar/switches or other inputs that control interior lamps
  • Check for aftermarket devices or recent repairs that altered wiring
  • Measure battery voltage to rule out low-voltage conditions

Signal parameters

  • Expected supply voltage at lamp socket with ignition on or lamps on: ~11.5–14.5 V
  • Expected ground continuity to chassis: near 0 ohms (check with meter)
  • If BCM is low-side switching: driver output should switch to ground when lamp commanded ON (0–1 V at driver while on, open/high when off)
  • If BCM uses PWM for dimming: duty cycle 0–100% depending on dimmer setting (verify with scope or lab meter)
  • Typical current draw per incandescent interior lamp: ~0.1–1.5 A depending on bulb type; LED modules draw much less (tens to hundreds of mA)

Diagnostic algorithm

  1. Connect a diagnostic scan tool. Read and record B2471 and any other stored or pending codes and freeze-frame data. Clear codes and attempt to reproduce the fault to verify persistence.
  2. Perform a visual inspection of the interior lamp(s), sockets, connectors, wiring harness (especially at door hinges and body seams), and check for signs of water intrusion or physical damage.
  3. Verify related fuses and fusible links are intact. Replace any blown fuse and retest. Note: a blown fuse may indicate a short.
  4. With lamps commanded ON, measure voltage at the lamp socket positive terminal and at the ground terminal. Expected voltage ~12 V when ON. If voltage is absent, trace back toward BCM/fuse.
  5. Test continuity from lamp ground to chassis ground with battery disconnected. Repair any high-resistance or open ground connections.
  6. If bulb(s) are removable, replace with a known-good bulb or bench-test the bulb to rule out filament failure or LED module issues.
  7. Perform a wiggle test on harness and connector while observing lamp function and scan tool live data for BCM outputs or related inputs (door switches).
  8. If voltage is present but lamp does not operate, check for high-resistance connections or internal lamp assembly failure (especially for LED modules where driver electronics can fail).
  9. Back-probe the BCM output for the lamp circuit (refer to service manual pinout). Verify the BCM is commanding the correct signal (switch to ground or PWM) when lamps are requested ON/OFF. Use scope if PWM suspected.
  10. If BCM output is absent or stuck (always on/off) and wiring checks good, disconnect the lamp circuit at the BCM connector and check for shorts to battery or ground. If no wiring fault is found, consider BCM reprogramming or replacement per manufacturer procedures.
  11. After repairs, clear codes and perform function check over several ignition cycles and door operations to confirm repair. Monitor for recurrence or new codes.

Likely causes

  • Bulb(s) burned out or high-resistance socket connection
  • Corroded/loose ground at lamp or chassis
  • Open or short in lamp harness near door hinge or lamp location
  • Faulty BCM output driver (stuck open/shorted)
  • Blown fuse protecting the interior lamp circuit

Fault status

⚠️ Status
Body Control Module detected an interior lamp circuit fault (open/short/excessive load or driver fault). Further testing required to isolate wiring, lamp, switch, or BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2470 B2472 B2500 B1234
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B2471

MITSUBISHI B — Body

On hook button stuck

Brand: MITSUBISHI
Type: B — Body
Views: UK: 24 EN: 37 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Burned-out or damaged interior lamp bulb(s)
  • Blown fuse or fusible link for interior lighting circuit
  • Poor or corroded ground/connector at lamp or harness
  • Open or shorted wiring (to ground or battery) in the lamp circuit
  • Faulty door ajar/switch or other input causing incorrect BCM lamp control
  • Faulty BCM or internal driver transistor

Symptoms

  • Interior/dome/map lamps do not illuminate when switched or when doors open
  • Interior lamps flicker or are intermittently functional
  • Interior lamps remain on and cause battery drain
  • Lamp behavior inconsistent with switch/dimmer settings
  • Related HVAC/display lighting may be affected (depending on vehicle wiring)
  • Stored B2471 code and possibly related body codes

What to check

  • Read and record freeze-frame and any related codes with a scan tool; attempt to recreate the fault
  • Visual inspection of lamp assemblies, sockets, connectors, and wiring for damage, corrosion, or water
  • Verify fuses and fusible links for the interior lighting circuit
  • Inspect and test door ajar/switches or other inputs that control interior lamps
  • Check for aftermarket devices or recent repairs that altered wiring
  • Measure battery voltage to rule out low-voltage conditions

Signal parameters

  • Expected supply voltage at lamp socket with ignition on or lamps on: ~11.5–14.5 V
  • Expected ground continuity to chassis: near 0 ohms (check with meter)
  • If BCM is low-side switching: driver output should switch to ground when lamp commanded ON (0–1 V at driver while on, open/high when off)
  • If BCM uses PWM for dimming: duty cycle 0–100% depending on dimmer setting (verify with scope or lab meter)
  • Typical current draw per incandescent interior lamp: ~0.1–1.5 A depending on bulb type; LED modules draw much less (tens to hundreds of mA)

Diagnostic algorithm

  1. Connect a diagnostic scan tool. Read and record B2471 and any other stored or pending codes and freeze-frame data. Clear codes and attempt to reproduce the fault to verify persistence.
  2. Perform a visual inspection of the interior lamp(s), sockets, connectors, wiring harness (especially at door hinges and body seams), and check for signs of water intrusion or physical damage.
  3. Verify related fuses and fusible links are intact. Replace any blown fuse and retest. Note: a blown fuse may indicate a short.
  4. With lamps commanded ON, measure voltage at the lamp socket positive terminal and at the ground terminal. Expected voltage ~12 V when ON. If voltage is absent, trace back toward BCM/fuse.
  5. Test continuity from lamp ground to chassis ground with battery disconnected. Repair any high-resistance or open ground connections.
  6. If bulb(s) are removable, replace with a known-good bulb or bench-test the bulb to rule out filament failure or LED module issues.
  7. Perform a wiggle test on harness and connector while observing lamp function and scan tool live data for BCM outputs or related inputs (door switches).
  8. If voltage is present but lamp does not operate, check for high-resistance connections or internal lamp assembly failure (especially for LED modules where driver electronics can fail).
  9. Back-probe the BCM output for the lamp circuit (refer to service manual pinout). Verify the BCM is commanding the correct signal (switch to ground or PWM) when lamps are requested ON/OFF. Use scope if PWM suspected.
  10. If BCM output is absent or stuck (always on/off) and wiring checks good, disconnect the lamp circuit at the BCM connector and check for shorts to battery or ground. If no wiring fault is found, consider BCM reprogramming or replacement per manufacturer procedures.
  11. After repairs, clear codes and perform function check over several ignition cycles and door operations to confirm repair. Monitor for recurrence or new codes.

Likely causes

  • Bulb(s) burned out or high-resistance socket connection
  • Corroded/loose ground at lamp or chassis
  • Open or short in lamp harness near door hinge or lamp location
  • Faulty BCM output driver (stuck open/shorted)
  • Blown fuse protecting the interior lamp circuit

Fault status

⚠️ Status
Body Control Module detected an interior lamp circuit fault (open/short/excessive load or driver fault). Further testing required to isolate wiring, lamp, switch, or BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2470 B2472 B2500 B1234
406

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

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B2471

Other B — Body

Interior Fan Control Circuit Open

Brand: Other
Type: B — Body
Views: UK: 32 EN: 41 RU: 33
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Burned-out or damaged interior lamp bulb(s)
  • Blown fuse or fusible link for interior lighting circuit
  • Poor or corroded ground/connector at lamp or harness
  • Open or shorted wiring (to ground or battery) in the lamp circuit
  • Faulty door ajar/switch or other input causing incorrect BCM lamp control
  • Faulty BCM or internal driver transistor

Symptoms

  • Interior/dome/map lamps do not illuminate when switched or when doors open
  • Interior lamps flicker or are intermittently functional
  • Interior lamps remain on and cause battery drain
  • Lamp behavior inconsistent with switch/dimmer settings
  • Related HVAC/display lighting may be affected (depending on vehicle wiring)
  • Stored B2471 code and possibly related body codes

What to check

  • Read and record freeze-frame and any related codes with a scan tool; attempt to recreate the fault
  • Visual inspection of lamp assemblies, sockets, connectors, and wiring for damage, corrosion, or water
  • Verify fuses and fusible links for the interior lighting circuit
  • Inspect and test door ajar/switches or other inputs that control interior lamps
  • Check for aftermarket devices or recent repairs that altered wiring
  • Measure battery voltage to rule out low-voltage conditions

Signal parameters

  • Expected supply voltage at lamp socket with ignition on or lamps on: ~11.5–14.5 V
  • Expected ground continuity to chassis: near 0 ohms (check with meter)
  • If BCM is low-side switching: driver output should switch to ground when lamp commanded ON (0–1 V at driver while on, open/high when off)
  • If BCM uses PWM for dimming: duty cycle 0–100% depending on dimmer setting (verify with scope or lab meter)
  • Typical current draw per incandescent interior lamp: ~0.1–1.5 A depending on bulb type; LED modules draw much less (tens to hundreds of mA)

Diagnostic algorithm

  1. Connect a diagnostic scan tool. Read and record B2471 and any other stored or pending codes and freeze-frame data. Clear codes and attempt to reproduce the fault to verify persistence.
  2. Perform a visual inspection of the interior lamp(s), sockets, connectors, wiring harness (especially at door hinges and body seams), and check for signs of water intrusion or physical damage.
  3. Verify related fuses and fusible links are intact. Replace any blown fuse and retest. Note: a blown fuse may indicate a short.
  4. With lamps commanded ON, measure voltage at the lamp socket positive terminal and at the ground terminal. Expected voltage ~12 V when ON. If voltage is absent, trace back toward BCM/fuse.
  5. Test continuity from lamp ground to chassis ground with battery disconnected. Repair any high-resistance or open ground connections.
  6. If bulb(s) are removable, replace with a known-good bulb or bench-test the bulb to rule out filament failure or LED module issues.
  7. Perform a wiggle test on harness and connector while observing lamp function and scan tool live data for BCM outputs or related inputs (door switches).
  8. If voltage is present but lamp does not operate, check for high-resistance connections or internal lamp assembly failure (especially for LED modules where driver electronics can fail).
  9. Back-probe the BCM output for the lamp circuit (refer to service manual pinout). Verify the BCM is commanding the correct signal (switch to ground or PWM) when lamps are requested ON/OFF. Use scope if PWM suspected.
  10. If BCM output is absent or stuck (always on/off) and wiring checks good, disconnect the lamp circuit at the BCM connector and check for shorts to battery or ground. If no wiring fault is found, consider BCM reprogramming or replacement per manufacturer procedures.
  11. After repairs, clear codes and perform function check over several ignition cycles and door operations to confirm repair. Monitor for recurrence or new codes.

Likely causes

  • Bulb(s) burned out or high-resistance socket connection
  • Corroded/loose ground at lamp or chassis
  • Open or short in lamp harness near door hinge or lamp location
  • Faulty BCM output driver (stuck open/shorted)
  • Blown fuse protecting the interior lamp circuit

Fault status

⚠️ Status
Body Control Module detected an interior lamp circuit fault (open/short/excessive load or driver fault). Further testing required to isolate wiring, lamp, switch, or BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2470 B2472 B2500 B1234
5,707

The library contains 5,707 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

AUDI
1,160
HUMMER
138
HYUNDAI
371
ISUZU
86
LAND ROVER
320
LEXUS
1
LINCOLN
166
MERCEDES-BENZ
388
MERCURY
296
MITSUBISHI
406
PORSCHE
136
TESLA
58
TOYOTA
2,042
VOLKSWAGEN
139
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .