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Home / DTC / B2569 — Rear Fog Lamp Open

B2569 — Rear Fog Lamp Open

Detailed page for trouble code B2569.

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Code

B2569

HYUNDAI B — Body

Rear Fog Lamp Open

Brand: HYUNDAI
Type: B — Body
Views: UK: 13 EN: 16 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Burned-out (open) rear fog lamp bulb
  • Poor or disconnected connector at the lamp
  • Broken or damaged wiring (open circuit) between BCM and lamp
  • Corroded ground or power contact at lamp socket
  • Blown fuse or faulty relay in the fog lamp power supply
  • Faulty BCM or module output driver

Symptoms

  • Rear fog lamp does not illuminate when switched ON
  • Rear fog lamp indicator on dash may not light or may show a fault
  • Intermittent operation of rear fog lamp
  • Related warning light or DTC present in BCM

What to check

  • Visually inspect rear fog lamp bulb for a broken filament
  • Check lamp socket and connector for corrosion, bent pins, or damage
  • Verify fuse and relay for the rear fog lamp circuit
  • Check for voltage at the lamp socket with fog lamp switch ON
  • Measure continuity between BCM connector and lamp socket
  • Inspect wiring harness for chafing, breaks, or pinched areas

Signal parameters

  • Expected supply voltage at lamp socket with lamp ON: approx. 11–14 V
  • Expected bulb filament resistance (typical 21W lamp): about 5–10 Ω (infinite if filament open)
  • Expected current draw with lamp ON: ~1–2 A (depending on lamp wattage)
  • Open-circuit condition: infinite resistance / no continuity between power and ground at lamp socket
  • BCM output: switching command present (logic signal) even if lamp circuit open

Diagnostic algorithm

  1. Confirm symptom and note whether code is current or historical. Attempt to operate rear fog lamp and observe behavior.
  2. Visually inspect rear fog lamp bulb and socket. Replace bulb with a known-good bulb if filament appears broken.
  3. Inspect connector and wiring at the lamp for corrosion, loose terminals, or damage. Repair or clean as required.
  4. Check the appropriate fuse and relay for the fog lamp circuit. Replace any blown fuses and test relay operation.
  5. With fog lamp switch ON, measure voltage at the lamp socket power terminal relative to chassis ground. If ~12 V is present, suspect bulb/socket/ground issue.
  6. Measure continuity/resistance from the lamp power terminal back to the BCM output pin with connectors disconnected. An open reading indicates wiring/connector fault.
  7. Check ground continuity from lamp ground terminal to chassis. Repair any poor ground connections.
  8. If wiring and lamp are good but BCM output does not show the expected switching voltage or control signal, inspect BCM connector pins for damage and consider BCM diagnostics (reprogram/replace only after confirming wiring and load).
  9. Clear DTCs, retest the system multiple cycles to confirm repair and that the code does not return.

Likely causes

  • Failed rear fog lamp bulb (open filament)
  • Loose/disconnected lamp connector or corroded pins
  • Open or chafed wire in harness to rear fog lamp
  • Corroded/poor ground at lamp assembly
  • Fuse blown for fog lamp circuit

Fault status

⚠️ Status
BCM detected open circuit in rear fog lamp circuit (lamp not receiving expected electrical connection).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B2568 B2570 B2501 B0001 B2580
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Code

B2569

Other B — Body

Liftgate Disarm Switch Circuit Short to Ground

Brand: Other
Type: B — Body
Views: UK: 17 EN: 23 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Burned-out (open) rear fog lamp bulb
  • Poor or disconnected connector at the lamp
  • Broken or damaged wiring (open circuit) between BCM and lamp
  • Corroded ground or power contact at lamp socket
  • Blown fuse or faulty relay in the fog lamp power supply
  • Faulty BCM or module output driver

Symptoms

  • Rear fog lamp does not illuminate when switched ON
  • Rear fog lamp indicator on dash may not light or may show a fault
  • Intermittent operation of rear fog lamp
  • Related warning light or DTC present in BCM

What to check

  • Visually inspect rear fog lamp bulb for a broken filament
  • Check lamp socket and connector for corrosion, bent pins, or damage
  • Verify fuse and relay for the rear fog lamp circuit
  • Check for voltage at the lamp socket with fog lamp switch ON
  • Measure continuity between BCM connector and lamp socket
  • Inspect wiring harness for chafing, breaks, or pinched areas

Signal parameters

  • Expected supply voltage at lamp socket with lamp ON: approx. 11–14 V
  • Expected bulb filament resistance (typical 21W lamp): about 5–10 Ω (infinite if filament open)
  • Expected current draw with lamp ON: ~1–2 A (depending on lamp wattage)
  • Open-circuit condition: infinite resistance / no continuity between power and ground at lamp socket
  • BCM output: switching command present (logic signal) even if lamp circuit open

Diagnostic algorithm

  1. Confirm symptom and note whether code is current or historical. Attempt to operate rear fog lamp and observe behavior.
  2. Visually inspect rear fog lamp bulb and socket. Replace bulb with a known-good bulb if filament appears broken.
  3. Inspect connector and wiring at the lamp for corrosion, loose terminals, or damage. Repair or clean as required.
  4. Check the appropriate fuse and relay for the fog lamp circuit. Replace any blown fuses and test relay operation.
  5. With fog lamp switch ON, measure voltage at the lamp socket power terminal relative to chassis ground. If ~12 V is present, suspect bulb/socket/ground issue.
  6. Measure continuity/resistance from the lamp power terminal back to the BCM output pin with connectors disconnected. An open reading indicates wiring/connector fault.
  7. Check ground continuity from lamp ground terminal to chassis. Repair any poor ground connections.
  8. If wiring and lamp are good but BCM output does not show the expected switching voltage or control signal, inspect BCM connector pins for damage and consider BCM diagnostics (reprogram/replace only after confirming wiring and load).
  9. Clear DTCs, retest the system multiple cycles to confirm repair and that the code does not return.

Likely causes

  • Failed rear fog lamp bulb (open filament)
  • Loose/disconnected lamp connector or corroded pins
  • Open or chafed wire in harness to rear fog lamp
  • Corroded/poor ground at lamp assembly
  • Fuse blown for fog lamp circuit

Fault status

⚠️ Status
BCM detected open circuit in rear fog lamp circuit (lamp not receiving expected electrical connection).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B2568 B2570 B2501 B0001 B2580
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