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Home / DTC / B2580 — Headlamp High Beam Control Circuit

B2580 — Headlamp High Beam Control Circuit

Detailed page for trouble code B2580.

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Code

B2580

HUMMER B — Body

Headlamp High Beam Control Circuit

Brand: HUMMER
Type: B — Body
Views: UK: 11 EN: 23 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for headlamp/high-beam circuit
  • Failed high-beam bulb(s)
  • Open, short or high resistance in headlamp high-beam wiring
  • Corroded or loose connector/terminal at headlamp or BCM
  • Failed headlamp relay or relay socket
  • Faulty headlamp switch or multifunction stalk

Symptoms

  • High beam(s) inoperative or intermittent
  • High beam indicator behaves incorrectly or does not illuminate
  • One headlamp high beam works while the other does not
  • DTC stored in BCM and/or headlamp module
  • Possible flicker or dimming of high beams

What to check

  • Retrieve DTCs and freeze frame data with scan tool; check for other related codes
  • Perform visual inspection of headlamp bulbs, connectors, wiring harness and grounding points
  • Check fuses and headlamp/BCM relays for continuity and correct operation
  • Inspect for corrosion, water ingress, or damaged insulation near headlamps
  • Verify operation of headlamp switch/multifunction stalk and related inputs to BCM
  • Measure voltage and ground at the headlamp connector while operating high beams

Signal parameters

  • Headlamp high-beam control: typically 0 V when off, battery voltage (~12 V) or switched ground when on depending on design — verify with service manual
  • Connector reference: battery voltage present at fused feed with ignition on
  • Ground continuity: near 0 Ω from lamp ground to chassis
  • Current draw: consistent with bulb rating (consult service data) — abnormal low or high current indicates poor contact or short
  • Diagnostic data: BCM may report lamp status and current; compare to expected values in service manual

Diagnostic algorithm

  1. Read and record all stored codes and freeze frame data. Note whether code is for left/right or both.
  2. Perform a visual inspection of the headlamp assemblies, bulbs, sockets, connectors, and harness for damage, corrosion, or water intrusion.
  3. Verify fuses and relays for the headlamp/high-beam circuits. Replace if blown or suspect.
  4. Operate high beams while observing the connector at the lamp. Measure voltage on the control feed and ground with a multimeter. Note behavior when switch is actuated.
  5. If voltage is present at the lamp connector and bulb does not light, replace the bulb and retest.
  6. If no voltage at connector, backprobe the circuit and test continuity from the lamp connector to the BCM/relay output. Repair open or shorted wiring as found.
  7. Inspect and verify ground integrity at the lamp ground point; clean and tighten grounds as required.
  8. Check operation of the headlamp relay or driver module. If relay socket or relay wiring is faulty, repair or replace.
  9. If wiring, bulbs, fuses and relays are good but control output is incorrect, test the BCM output with a professional scan tool. Replace or reprogram BCM only after other causes are eliminated and per manufacturer procedures.
  10. Clear codes and perform a road/test cycle to confirm repair. Re-scan to ensure B2580 does not return.

Likely causes

  • Failed high-beam bulb or poor bulb contact
  • Corroded/loose connector at the headlamp or inline connector
  • Open/short in harness (damage from impact or rodent)
  • Blown fuse or faulty relay
  • Faulty BCM/headlamp driver (less common)

Fault status

⚠️ Status
Stored B2580 — Headlamp high-beam control circuit fault detected. May cause one or both high beams to be inoperative. Further diagnosis required to isolate wiring, component, or module failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2570 B2581 B2582 B2590 U0100
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Code

B2580

Other B — Body

Aux Blower Sense Switch Circuit Failure

Brand: Other
Type: B — Body
Views: UK: 21 EN: 37 RU: 29
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for headlamp/high-beam circuit
  • Failed high-beam bulb(s)
  • Open, short or high resistance in headlamp high-beam wiring
  • Corroded or loose connector/terminal at headlamp or BCM
  • Failed headlamp relay or relay socket
  • Faulty headlamp switch or multifunction stalk

Symptoms

  • High beam(s) inoperative or intermittent
  • High beam indicator behaves incorrectly or does not illuminate
  • One headlamp high beam works while the other does not
  • DTC stored in BCM and/or headlamp module
  • Possible flicker or dimming of high beams

What to check

  • Retrieve DTCs and freeze frame data with scan tool; check for other related codes
  • Perform visual inspection of headlamp bulbs, connectors, wiring harness and grounding points
  • Check fuses and headlamp/BCM relays for continuity and correct operation
  • Inspect for corrosion, water ingress, or damaged insulation near headlamps
  • Verify operation of headlamp switch/multifunction stalk and related inputs to BCM
  • Measure voltage and ground at the headlamp connector while operating high beams

Signal parameters

  • Headlamp high-beam control: typically 0 V when off, battery voltage (~12 V) or switched ground when on depending on design — verify with service manual
  • Connector reference: battery voltage present at fused feed with ignition on
  • Ground continuity: near 0 Ω from lamp ground to chassis
  • Current draw: consistent with bulb rating (consult service data) — abnormal low or high current indicates poor contact or short
  • Diagnostic data: BCM may report lamp status and current; compare to expected values in service manual

Diagnostic algorithm

  1. Read and record all stored codes and freeze frame data. Note whether code is for left/right or both.
  2. Perform a visual inspection of the headlamp assemblies, bulbs, sockets, connectors, and harness for damage, corrosion, or water intrusion.
  3. Verify fuses and relays for the headlamp/high-beam circuits. Replace if blown or suspect.
  4. Operate high beams while observing the connector at the lamp. Measure voltage on the control feed and ground with a multimeter. Note behavior when switch is actuated.
  5. If voltage is present at the lamp connector and bulb does not light, replace the bulb and retest.
  6. If no voltage at connector, backprobe the circuit and test continuity from the lamp connector to the BCM/relay output. Repair open or shorted wiring as found.
  7. Inspect and verify ground integrity at the lamp ground point; clean and tighten grounds as required.
  8. Check operation of the headlamp relay or driver module. If relay socket or relay wiring is faulty, repair or replace.
  9. If wiring, bulbs, fuses and relays are good but control output is incorrect, test the BCM output with a professional scan tool. Replace or reprogram BCM only after other causes are eliminated and per manufacturer procedures.
  10. Clear codes and perform a road/test cycle to confirm repair. Re-scan to ensure B2580 does not return.

Likely causes

  • Failed high-beam bulb or poor bulb contact
  • Corroded/loose connector at the headlamp or inline connector
  • Open/short in harness (damage from impact or rodent)
  • Blown fuse or faulty relay
  • Faulty BCM/headlamp driver (less common)

Fault status

⚠️ Status
Stored B2580 — Headlamp high-beam control circuit fault detected. May cause one or both high beams to be inoperative. Further diagnosis required to isolate wiring, component, or module failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2570 B2581 B2582 B2590 U0100
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