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Home / DTC / B2585 — Parklamp Control Circuit Malfunction

B2585 — Parklamp Control Circuit Malfunction

Detailed page for trouble code B2585.

34,405codes
59brands
11,914generic
22,491specific
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Code

B2585

HUMMER B — Body

Parklamp Control Circuit Malfunction

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

Causes

  • Blown fuse or tripped relay in park lamp circuit
  • Open, short to ground, or short to battery in wiring harness or connector
  • Corroded or loose connector at lamp or chassis ground
  • Failed park lamp bulb, LED module, or socket
  • Faulty ground or high-resistance ground connection
  • Faulty BCM or internal driver transistor

Symptoms

  • Park/position lamp(s) inoperative on one or both sides
  • Park lamps flicker or operate intermittently
  • Park lamps remain ON and do not turn off
  • Illumination level abnormally dim or uneven
  • Battery drain with vehicle parked (if lamp stays on)
  • DTC B2585 stored in BCM and may set a lamp-on warning

What to check

  • Retrieve freeze frame and current status with a scan tool; verify active/inactive status and any related codes
  • Visually inspect fuses and relays for the park lamp circuit; verify continuity of fuse
  • Inspect lamp assemblies, sockets, and connectors for corrosion, melted plastic, or water ingress
  • Verify correct bulb/LED type and seating; test/replace bulb with known-good unit
  • Inspect wiring harness along routes to bumper/lighting for damage, pinching, or chafing
  • Check ground connections for the lamp and BCM; clean and retighten to body ground

Signal parameters

  • Expected battery voltage at lamp connector with lights ON: ~12–14.5 V (for supply side)
  • Open-circuit/0 V observed if supply is open; near 0 V on output if driver is switched to ground
  • Expected current: incandescent park lamp typically 0.5–2.0 A; LED modules typically 0.05–0.5 A (varies by design)
  • Ground resistance: chassis ground to battery negative
  • BCM driver behavior: switched output or PWM dimming — verify presence/absence of PWM (typical frequency range 50–1000 Hz depending on system)
  • Connector pin voltages should switch or pulse when the light switch is operated; stuck voltage indicates short or driver fault

Diagnostic algorithm

  1. Connect a capable scan tool and read BCM data and stored/active DTCs. Note related codes and lamp status.
  2. Visually inspect fuses, relays and lamp assemblies; replace any blown fuse and test function. If fuse blows immediately, stop and suspect short to battery.
  3. With lamp switch ON, backprobe the lamp connector: measure supply voltage and ground reference. If correct voltage is present and lamp does not light, test/replace lamp or module.
  4. If no voltage at connector, trace supply/backfeed: check fuse circuit and continuity between fuse/relay output and lamp connector. Repair any open circuits.
  5. If supply present but intermittent or low voltage, inspect connectors and harness for corrosion/damage; repair or replace damaged sections and clean contacts.
  6. Check ground continuity from lamp socket to battery negative; repair/clean grounds if resistance is high.
  7. If wiring checks OK, use a lab scope or DVM to check for PWM or switching behavior at BCM output. If BCM output is absent or shorted to battery/ground, disconnect connector and check output pin resistance.
  8. If output driver appears failed or shorts when connected, isolate BCM by disconnecting load and re-test; if fault persists with no load, suspect BCM/module failure and consider replacement or repair.
  9. After repair, clear codes and verify proper operation through multiple cycles (on/off, start/stop) and re-scan for reappearance of B2585.
  10. If intermittent and wiring/lamps test good, consult manufacturer technical service bulletins and wiring diagrams for harness chafe locations or BCM updates.

Likely causes

  • Blown fuse or bad connector at lamp (most common)
  • Open or shorted harness between BCM and lamp (wire chafe or pinched)
  • Corroded lamp/ground connector causing intermittent contact
  • Failed lamp/LED module (especially if aftermarket replacements used)
  • Faulty BCM output driver or internal module fault (less common)

Fault status

⚠️ Status
Parklamp Control Circuit Malfunction detected by BCM. Lamp circuit is open/shorting/abnormal; lamp may be inoperative, flickering, stuck on, or causing an electrical fault. Further electrical diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2580 B2584 B2586 B2590 U1000
Repair manuals

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Code

B2585

HYUNDAI B — Body

Rear LH Tail And LH/RH License Lamp Circuit Open

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

Causes

  • Blown fuse or tripped relay in park lamp circuit
  • Open, short to ground, or short to battery in wiring harness or connector
  • Corroded or loose connector at lamp or chassis ground
  • Failed park lamp bulb, LED module, or socket
  • Faulty ground or high-resistance ground connection
  • Faulty BCM or internal driver transistor

Symptoms

  • Park/position lamp(s) inoperative on one or both sides
  • Park lamps flicker or operate intermittently
  • Park lamps remain ON and do not turn off
  • Illumination level abnormally dim or uneven
  • Battery drain with vehicle parked (if lamp stays on)
  • DTC B2585 stored in BCM and may set a lamp-on warning

What to check

  • Retrieve freeze frame and current status with a scan tool; verify active/inactive status and any related codes
  • Visually inspect fuses and relays for the park lamp circuit; verify continuity of fuse
  • Inspect lamp assemblies, sockets, and connectors for corrosion, melted plastic, or water ingress
  • Verify correct bulb/LED type and seating; test/replace bulb with known-good unit
  • Inspect wiring harness along routes to bumper/lighting for damage, pinching, or chafing
  • Check ground connections for the lamp and BCM; clean and retighten to body ground

Signal parameters

  • Expected battery voltage at lamp connector with lights ON: ~12–14.5 V (for supply side)
  • Open-circuit/0 V observed if supply is open; near 0 V on output if driver is switched to ground
  • Expected current: incandescent park lamp typically 0.5–2.0 A; LED modules typically 0.05–0.5 A (varies by design)
  • Ground resistance: chassis ground to battery negative
  • BCM driver behavior: switched output or PWM dimming — verify presence/absence of PWM (typical frequency range 50–1000 Hz depending on system)
  • Connector pin voltages should switch or pulse when the light switch is operated; stuck voltage indicates short or driver fault

Diagnostic algorithm

  1. Connect a capable scan tool and read BCM data and stored/active DTCs. Note related codes and lamp status.
  2. Visually inspect fuses, relays and lamp assemblies; replace any blown fuse and test function. If fuse blows immediately, stop and suspect short to battery.
  3. With lamp switch ON, backprobe the lamp connector: measure supply voltage and ground reference. If correct voltage is present and lamp does not light, test/replace lamp or module.
  4. If no voltage at connector, trace supply/backfeed: check fuse circuit and continuity between fuse/relay output and lamp connector. Repair any open circuits.
  5. If supply present but intermittent or low voltage, inspect connectors and harness for corrosion/damage; repair or replace damaged sections and clean contacts.
  6. Check ground continuity from lamp socket to battery negative; repair/clean grounds if resistance is high.
  7. If wiring checks OK, use a lab scope or DVM to check for PWM or switching behavior at BCM output. If BCM output is absent or shorted to battery/ground, disconnect connector and check output pin resistance.
  8. If output driver appears failed or shorts when connected, isolate BCM by disconnecting load and re-test; if fault persists with no load, suspect BCM/module failure and consider replacement or repair.
  9. After repair, clear codes and verify proper operation through multiple cycles (on/off, start/stop) and re-scan for reappearance of B2585.
  10. If intermittent and wiring/lamps test good, consult manufacturer technical service bulletins and wiring diagrams for harness chafe locations or BCM updates.

Likely causes

  • Blown fuse or bad connector at lamp (most common)
  • Open or shorted harness between BCM and lamp (wire chafe or pinched)
  • Corroded lamp/ground connector causing intermittent contact
  • Failed lamp/LED module (especially if aftermarket replacements used)
  • Faulty BCM output driver or internal module fault (less common)

Fault status

⚠️ Status
Parklamp Control Circuit Malfunction detected by BCM. Lamp circuit is open/shorting/abnormal; lamp may be inoperative, flickering, stuck on, or causing an electrical fault. Further electrical diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2580 B2584 B2586 B2590 U1000
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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+100 karma for a short comment :)
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Code

B2585

Other B — Body

Anti Theft Input Signal Circuit Short To Battery

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

Causes

  • Blown fuse or tripped relay in park lamp circuit
  • Open, short to ground, or short to battery in wiring harness or connector
  • Corroded or loose connector at lamp or chassis ground
  • Failed park lamp bulb, LED module, or socket
  • Faulty ground or high-resistance ground connection
  • Faulty BCM or internal driver transistor

Symptoms

  • Park/position lamp(s) inoperative on one or both sides
  • Park lamps flicker or operate intermittently
  • Park lamps remain ON and do not turn off
  • Illumination level abnormally dim or uneven
  • Battery drain with vehicle parked (if lamp stays on)
  • DTC B2585 stored in BCM and may set a lamp-on warning

What to check

  • Retrieve freeze frame and current status with a scan tool; verify active/inactive status and any related codes
  • Visually inspect fuses and relays for the park lamp circuit; verify continuity of fuse
  • Inspect lamp assemblies, sockets, and connectors for corrosion, melted plastic, or water ingress
  • Verify correct bulb/LED type and seating; test/replace bulb with known-good unit
  • Inspect wiring harness along routes to bumper/lighting for damage, pinching, or chafing
  • Check ground connections for the lamp and BCM; clean and retighten to body ground

Signal parameters

  • Expected battery voltage at lamp connector with lights ON: ~12–14.5 V (for supply side)
  • Open-circuit/0 V observed if supply is open; near 0 V on output if driver is switched to ground
  • Expected current: incandescent park lamp typically 0.5–2.0 A; LED modules typically 0.05–0.5 A (varies by design)
  • Ground resistance: chassis ground to battery negative
  • BCM driver behavior: switched output or PWM dimming — verify presence/absence of PWM (typical frequency range 50–1000 Hz depending on system)
  • Connector pin voltages should switch or pulse when the light switch is operated; stuck voltage indicates short or driver fault

Diagnostic algorithm

  1. Connect a capable scan tool and read BCM data and stored/active DTCs. Note related codes and lamp status.
  2. Visually inspect fuses, relays and lamp assemblies; replace any blown fuse and test function. If fuse blows immediately, stop and suspect short to battery.
  3. With lamp switch ON, backprobe the lamp connector: measure supply voltage and ground reference. If correct voltage is present and lamp does not light, test/replace lamp or module.
  4. If no voltage at connector, trace supply/backfeed: check fuse circuit and continuity between fuse/relay output and lamp connector. Repair any open circuits.
  5. If supply present but intermittent or low voltage, inspect connectors and harness for corrosion/damage; repair or replace damaged sections and clean contacts.
  6. Check ground continuity from lamp socket to battery negative; repair/clean grounds if resistance is high.
  7. If wiring checks OK, use a lab scope or DVM to check for PWM or switching behavior at BCM output. If BCM output is absent or shorted to battery/ground, disconnect connector and check output pin resistance.
  8. If output driver appears failed or shorts when connected, isolate BCM by disconnecting load and re-test; if fault persists with no load, suspect BCM/module failure and consider replacement or repair.
  9. After repair, clear codes and verify proper operation through multiple cycles (on/off, start/stop) and re-scan for reappearance of B2585.
  10. If intermittent and wiring/lamps test good, consult manufacturer technical service bulletins and wiring diagrams for harness chafe locations or BCM updates.

Likely causes

  • Blown fuse or bad connector at lamp (most common)
  • Open or shorted harness between BCM and lamp (wire chafe or pinched)
  • Corroded lamp/ground connector causing intermittent contact
  • Failed lamp/LED module (especially if aftermarket replacements used)
  • Faulty BCM output driver or internal module fault (less common)

Fault status

⚠️ Status
Parklamp Control Circuit Malfunction detected by BCM. Lamp circuit is open/shorting/abnormal; lamp may be inoperative, flickering, stuck on, or causing an electrical fault. Further electrical diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

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B2580 B2584 B2586 B2590 U1000
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