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Home / DTC / B2474 — Navigation Display Head (NDH) Back Lighting Malfunction

B2474 — Navigation Display Head (NDH) Back Lighting Malfunction

Detailed page for trouble code B2474.

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22,491specific
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Code

B2474

HUMMER B — Body

Navigation Display Head (NDH) Back Lighting Malfunction

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

Causes

  • Failed NDH backlight (LED array or driver)
  • Blown fuse for radio/navigation/display circuit
  • Open, short, or high resistance in power or ground wiring to NDH
  • Corroded or loose connector at NDH or body harness
  • Faulty dimmer/illumination control or wrong setting
  • Body control module (BCM) or NDH internal electronics/software fault

Symptoms

  • Navigation display backlight is completely off
  • Display is dim or unevenly lit
  • Backlight flickers or varies with engine speed/lighting
  • Warning message on display about illumination
  • Other interior lighting behaves abnormally (if shared circuit)

What to check

  • Retrieve all stored codes with a scan tool and note freeze frame/related codes
  • Visually inspect fuse(s) for radio/NDH and interior illumination; verify correct fuse rating
  • Inspect NDH harness connector for corrosion, bent pins, or water intrusion
  • Check for related symptoms on other illuminated components (cluster, radio) to identify shared circuit
  • Verify dimmer/illumination control position and operation
  • Check for recent wiring repairs or water leaks near dash and NDH area

Signal parameters

  • Backlight supply voltage (key ON): approx. 11–14 V (or PWM 0–12 V depending on design)
  • Backlight ground continuity: < 2 ohms to chassis
  • PWM dimming (if used): present on control pin, typical frequency 100–1000 Hz and duty cycle varies with dimmer
  • CAN/LIN messages: NDH and BCM communication present and error-free when scanning

Diagnostic algorithm

  1. Connect a diagnostic scan tool, read and record B2474 and any other codes; clear codes and attempt to reproduce.
  2. Inspect fuses related to the radio/NDH and interior lighting; replace suspect fuses and retest.
  3. Visually inspect NDH connector and harness for damage, corrosion, moisture, or pin push-out; repair as necessary.
  4. With key ON, backprobe the NDH backlight power and ground pins: verify supply voltage (~11–14 V) and good ground. If no supply, trace back to fuse/relay/BCM.
  5. If supply present but backlight off, check for PWM dimming signal from dimmer/BCM on the control pin. Use oscilloscope or multimeter (duty cycle change with dimmer).
  6. Wiggle test harness and connectors while observing backlight for intermittent faults.
  7. If wiring and control signals are correct but backlight remains faulty, remove NDH and bench-test or replace the NDH assembly/LED driver per vendor procedure.
  8. If intermittent or communication-related, inspect CAN/LIN wiring and perform module communication tests; reflash/update NDH/BCM software if a technical service bulletin (TSB) recommends.
  9. After repair, clear codes and verify system operation under all lighting/dimmer conditions; perform road test if necessary.

Likely causes

  • Open or short in backlight power feed or ground
  • Failed LED driver inside the NDH assembly
  • Blown or weak fuse protecting the NDH supply
  • Poor connector contact or corrosion at NDH harness
  • Faulty instrument panel dimmer switch or BCM output

Fault status

⚠️ Status
NDH back lighting malfunction detected — inspect NDH assembly, illumination circuit, and related controls.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B2470 B2471 B2475 B2479 U0422
Repair manuals

Manual library for HUMMER

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Code

B2474

MITSUBISHI B — Body

Self Test

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

Causes

  • Failed NDH backlight (LED array or driver)
  • Blown fuse for radio/navigation/display circuit
  • Open, short, or high resistance in power or ground wiring to NDH
  • Corroded or loose connector at NDH or body harness
  • Faulty dimmer/illumination control or wrong setting
  • Body control module (BCM) or NDH internal electronics/software fault

Symptoms

  • Navigation display backlight is completely off
  • Display is dim or unevenly lit
  • Backlight flickers or varies with engine speed/lighting
  • Warning message on display about illumination
  • Other interior lighting behaves abnormally (if shared circuit)

What to check

  • Retrieve all stored codes with a scan tool and note freeze frame/related codes
  • Visually inspect fuse(s) for radio/NDH and interior illumination; verify correct fuse rating
  • Inspect NDH harness connector for corrosion, bent pins, or water intrusion
  • Check for related symptoms on other illuminated components (cluster, radio) to identify shared circuit
  • Verify dimmer/illumination control position and operation
  • Check for recent wiring repairs or water leaks near dash and NDH area

Signal parameters

  • Backlight supply voltage (key ON): approx. 11–14 V (or PWM 0–12 V depending on design)
  • Backlight ground continuity: < 2 ohms to chassis
  • PWM dimming (if used): present on control pin, typical frequency 100–1000 Hz and duty cycle varies with dimmer
  • CAN/LIN messages: NDH and BCM communication present and error-free when scanning

Diagnostic algorithm

  1. Connect a diagnostic scan tool, read and record B2474 and any other codes; clear codes and attempt to reproduce.
  2. Inspect fuses related to the radio/NDH and interior lighting; replace suspect fuses and retest.
  3. Visually inspect NDH connector and harness for damage, corrosion, moisture, or pin push-out; repair as necessary.
  4. With key ON, backprobe the NDH backlight power and ground pins: verify supply voltage (~11–14 V) and good ground. If no supply, trace back to fuse/relay/BCM.
  5. If supply present but backlight off, check for PWM dimming signal from dimmer/BCM on the control pin. Use oscilloscope or multimeter (duty cycle change with dimmer).
  6. Wiggle test harness and connectors while observing backlight for intermittent faults.
  7. If wiring and control signals are correct but backlight remains faulty, remove NDH and bench-test or replace the NDH assembly/LED driver per vendor procedure.
  8. If intermittent or communication-related, inspect CAN/LIN wiring and perform module communication tests; reflash/update NDH/BCM software if a technical service bulletin (TSB) recommends.
  9. After repair, clear codes and verify system operation under all lighting/dimmer conditions; perform road test if necessary.

Likely causes

  • Open or short in backlight power feed or ground
  • Failed LED driver inside the NDH assembly
  • Blown or weak fuse protecting the NDH supply
  • Poor connector contact or corrosion at NDH harness
  • Faulty instrument panel dimmer switch or BCM output

Fault status

⚠️ Status
NDH back lighting malfunction detected — inspect NDH assembly, illumination circuit, and related controls.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B2470 B2471 B2475 B2479 U0422
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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+100 karma for a short comment :)
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Code

B2474

Other B — Body

Passenger Door Lock Switch Circuit Shorted to Ground

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

Causes

  • Failed NDH backlight (LED array or driver)
  • Blown fuse for radio/navigation/display circuit
  • Open, short, or high resistance in power or ground wiring to NDH
  • Corroded or loose connector at NDH or body harness
  • Faulty dimmer/illumination control or wrong setting
  • Body control module (BCM) or NDH internal electronics/software fault

Symptoms

  • Navigation display backlight is completely off
  • Display is dim or unevenly lit
  • Backlight flickers or varies with engine speed/lighting
  • Warning message on display about illumination
  • Other interior lighting behaves abnormally (if shared circuit)

What to check

  • Retrieve all stored codes with a scan tool and note freeze frame/related codes
  • Visually inspect fuse(s) for radio/NDH and interior illumination; verify correct fuse rating
  • Inspect NDH harness connector for corrosion, bent pins, or water intrusion
  • Check for related symptoms on other illuminated components (cluster, radio) to identify shared circuit
  • Verify dimmer/illumination control position and operation
  • Check for recent wiring repairs or water leaks near dash and NDH area

Signal parameters

  • Backlight supply voltage (key ON): approx. 11–14 V (or PWM 0–12 V depending on design)
  • Backlight ground continuity: < 2 ohms to chassis
  • PWM dimming (if used): present on control pin, typical frequency 100–1000 Hz and duty cycle varies with dimmer
  • CAN/LIN messages: NDH and BCM communication present and error-free when scanning

Diagnostic algorithm

  1. Connect a diagnostic scan tool, read and record B2474 and any other codes; clear codes and attempt to reproduce.
  2. Inspect fuses related to the radio/NDH and interior lighting; replace suspect fuses and retest.
  3. Visually inspect NDH connector and harness for damage, corrosion, moisture, or pin push-out; repair as necessary.
  4. With key ON, backprobe the NDH backlight power and ground pins: verify supply voltage (~11–14 V) and good ground. If no supply, trace back to fuse/relay/BCM.
  5. If supply present but backlight off, check for PWM dimming signal from dimmer/BCM on the control pin. Use oscilloscope or multimeter (duty cycle change with dimmer).
  6. Wiggle test harness and connectors while observing backlight for intermittent faults.
  7. If wiring and control signals are correct but backlight remains faulty, remove NDH and bench-test or replace the NDH assembly/LED driver per vendor procedure.
  8. If intermittent or communication-related, inspect CAN/LIN wiring and perform module communication tests; reflash/update NDH/BCM software if a technical service bulletin (TSB) recommends.
  9. After repair, clear codes and verify system operation under all lighting/dimmer conditions; perform road test if necessary.

Likely causes

  • Open or short in backlight power feed or ground
  • Failed LED driver inside the NDH assembly
  • Blown or weak fuse protecting the NDH supply
  • Poor connector contact or corrosion at NDH harness
  • Faulty instrument panel dimmer switch or BCM output

Fault status

⚠️ Status
NDH back lighting malfunction detected — inspect NDH assembly, illumination circuit, and related controls.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B2470 B2471 B2475 B2479 U0422
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