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Home / DTC / B1482 — Battery Rundown Protection Circuit Low (BCM)

B1482 — Battery Rundown Protection Circuit Low (BCM)

Detailed page for trouble code B1482.

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Code

B1482

HUMMER B — Body

Battery Rundown Protection Circuit Low (BCM)

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

Causes

  • Low battery state of charge
  • Corroded or loose battery terminals or cable
  • Blown fuse or faulty relay in the BCM power/rundown circuit
  • High parasitic current (accessory draw) when vehicle is off
  • Poor or high-resistance ground to BCM
  • Open or short in wiring to the rundown protection circuit

Symptoms

  • Warning lamp or message about battery/vehicle electrical system
  • Some convenience features disabled (audio, interior lights, remote functions)
  • Difficulty starting or slow cranking at times
  • Illuminated dash errors related to BCM or CAN communication
  • Repeated or intermittent B1482 stored in BCM

What to check

  • Verify vehicle battery state of charge and health (battery test/load test)
  • Inspect and clean battery terminals and cable connections; ensure tight clamping
  • Check fuses and relays related to BCM power and battery rundown protection
  • Measure resting battery voltage with ignition off and after vehicle has sat
  • Perform parasitic current draw test (mA) with all doors closed and modules asleep
  • Scan BCM with a suitable scan tool for freeze frame, related DTCs and module voltages

Signal parameters

  • Battery resting voltage: nominal 12.4–12.7 V (acceptable range varies by manufacturer)
  • Charging/operating voltage: approx. 13.5–14.7 V with engine running
  • Cranking voltage: typically above ~9.6 V under load (varies by vehicle)
  • Parasitic draw: usually
  • BCM supply pin voltage: should match battery/ignition feed per wiring diagram
  • Module ground continuity/voltage drop: minimal; check for >0.1–0.2 V across ground connections

Diagnostic algorithm

  1. Connect a capable scan tool; read and record B1482 freeze frame and any other stored codes. Note conditions when code set (SOC, ignition state, temperature).
  2. Verify battery state of charge and perform a battery load test. Recharge or replace battery if below spec.
  3. Inspect battery positive/negative terminals, cable end condition and clamps. Clean and retighten if corrosion or looseness found.
  4. Check relevant fuses and relays for the BCM and Battery Rundown Protection circuit; replace if blown or intermittent.
  5. With vehicle asleep, perform parasitic current draw test. If draw is excessive, isolate circuits by removing fuses to find the source.
  6. Backprobe BCM power and ground pins; measure voltage and voltage drop while key off and with accessory loads applied. Compare to expected values.
  7. Inspect wiring harness and connectors between battery, ignition switch, and BCM for damage, corrosion, or poor crimps. Repair as needed.
  8. Verify charging system output and battery wiring under engine running conditions.
  9. If wiring, connections, battery and charging system are good, attempt BCM software update/reflash per manufacturer service info.
  10. If fault persists after wiring and software checks, consider module bench testing or replacement following manufacturer procedures; clear codes and retest to confirm.

Likely causes

  • Battery voltage below acceptable threshold (weak or discharged battery)
  • Intermittent connection at battery positive or ground causing voltage drop
  • Faulty rundown relay/FET or its control circuit in the BCM
  • Aftermarket accessory causing excessive drain or a short to ground
  • Corroded connector or damaged harness between battery and BCM
  • BCM software fault requiring reprogramming or module replacement

Fault status

⚠️ Status
BCM detected low voltage on the Battery Rundown Protection circuit. Non‑essential loads may be disabled to protect the battery. Inspect battery, connections, fuses, and BCM power/ground.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1481 B1483 U0100 U0121 P0562
Repair manuals

Manual library for HUMMER

138

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Code

B1482

MITSUBISHI B — Body

F ABG(2)DR squib grounding

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

Causes

  • Low battery state of charge
  • Corroded or loose battery terminals or cable
  • Blown fuse or faulty relay in the BCM power/rundown circuit
  • High parasitic current (accessory draw) when vehicle is off
  • Poor or high-resistance ground to BCM
  • Open or short in wiring to the rundown protection circuit

Symptoms

  • Warning lamp or message about battery/vehicle electrical system
  • Some convenience features disabled (audio, interior lights, remote functions)
  • Difficulty starting or slow cranking at times
  • Illuminated dash errors related to BCM or CAN communication
  • Repeated or intermittent B1482 stored in BCM

What to check

  • Verify vehicle battery state of charge and health (battery test/load test)
  • Inspect and clean battery terminals and cable connections; ensure tight clamping
  • Check fuses and relays related to BCM power and battery rundown protection
  • Measure resting battery voltage with ignition off and after vehicle has sat
  • Perform parasitic current draw test (mA) with all doors closed and modules asleep
  • Scan BCM with a suitable scan tool for freeze frame, related DTCs and module voltages

Signal parameters

  • Battery resting voltage: nominal 12.4–12.7 V (acceptable range varies by manufacturer)
  • Charging/operating voltage: approx. 13.5–14.7 V with engine running
  • Cranking voltage: typically above ~9.6 V under load (varies by vehicle)
  • Parasitic draw: usually
  • BCM supply pin voltage: should match battery/ignition feed per wiring diagram
  • Module ground continuity/voltage drop: minimal; check for >0.1–0.2 V across ground connections

Diagnostic algorithm

  1. Connect a capable scan tool; read and record B1482 freeze frame and any other stored codes. Note conditions when code set (SOC, ignition state, temperature).
  2. Verify battery state of charge and perform a battery load test. Recharge or replace battery if below spec.
  3. Inspect battery positive/negative terminals, cable end condition and clamps. Clean and retighten if corrosion or looseness found.
  4. Check relevant fuses and relays for the BCM and Battery Rundown Protection circuit; replace if blown or intermittent.
  5. With vehicle asleep, perform parasitic current draw test. If draw is excessive, isolate circuits by removing fuses to find the source.
  6. Backprobe BCM power and ground pins; measure voltage and voltage drop while key off and with accessory loads applied. Compare to expected values.
  7. Inspect wiring harness and connectors between battery, ignition switch, and BCM for damage, corrosion, or poor crimps. Repair as needed.
  8. Verify charging system output and battery wiring under engine running conditions.
  9. If wiring, connections, battery and charging system are good, attempt BCM software update/reflash per manufacturer service info.
  10. If fault persists after wiring and software checks, consider module bench testing or replacement following manufacturer procedures; clear codes and retest to confirm.

Likely causes

  • Battery voltage below acceptable threshold (weak or discharged battery)
  • Intermittent connection at battery positive or ground causing voltage drop
  • Faulty rundown relay/FET or its control circuit in the BCM
  • Aftermarket accessory causing excessive drain or a short to ground
  • Corroded connector or damaged harness between battery and BCM
  • BCM software fault requiring reprogramming or module replacement

Fault status

⚠️ Status
BCM detected low voltage on the Battery Rundown Protection circuit. Non‑essential loads may be disabled to protect the battery. Inspect battery, connections, fuses, and BCM power/ground.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1481 B1483 U0100 U0121 P0562
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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Code

B1482

Other B — Body

Wiper Washer Fluid Level Sensor Circuit Short To Ground

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

Causes

  • Low battery state of charge
  • Corroded or loose battery terminals or cable
  • Blown fuse or faulty relay in the BCM power/rundown circuit
  • High parasitic current (accessory draw) when vehicle is off
  • Poor or high-resistance ground to BCM
  • Open or short in wiring to the rundown protection circuit

Symptoms

  • Warning lamp or message about battery/vehicle electrical system
  • Some convenience features disabled (audio, interior lights, remote functions)
  • Difficulty starting or slow cranking at times
  • Illuminated dash errors related to BCM or CAN communication
  • Repeated or intermittent B1482 stored in BCM

What to check

  • Verify vehicle battery state of charge and health (battery test/load test)
  • Inspect and clean battery terminals and cable connections; ensure tight clamping
  • Check fuses and relays related to BCM power and battery rundown protection
  • Measure resting battery voltage with ignition off and after vehicle has sat
  • Perform parasitic current draw test (mA) with all doors closed and modules asleep
  • Scan BCM with a suitable scan tool for freeze frame, related DTCs and module voltages

Signal parameters

  • Battery resting voltage: nominal 12.4–12.7 V (acceptable range varies by manufacturer)
  • Charging/operating voltage: approx. 13.5–14.7 V with engine running
  • Cranking voltage: typically above ~9.6 V under load (varies by vehicle)
  • Parasitic draw: usually
  • BCM supply pin voltage: should match battery/ignition feed per wiring diagram
  • Module ground continuity/voltage drop: minimal; check for >0.1–0.2 V across ground connections

Diagnostic algorithm

  1. Connect a capable scan tool; read and record B1482 freeze frame and any other stored codes. Note conditions when code set (SOC, ignition state, temperature).
  2. Verify battery state of charge and perform a battery load test. Recharge or replace battery if below spec.
  3. Inspect battery positive/negative terminals, cable end condition and clamps. Clean and retighten if corrosion or looseness found.
  4. Check relevant fuses and relays for the BCM and Battery Rundown Protection circuit; replace if blown or intermittent.
  5. With vehicle asleep, perform parasitic current draw test. If draw is excessive, isolate circuits by removing fuses to find the source.
  6. Backprobe BCM power and ground pins; measure voltage and voltage drop while key off and with accessory loads applied. Compare to expected values.
  7. Inspect wiring harness and connectors between battery, ignition switch, and BCM for damage, corrosion, or poor crimps. Repair as needed.
  8. Verify charging system output and battery wiring under engine running conditions.
  9. If wiring, connections, battery and charging system are good, attempt BCM software update/reflash per manufacturer service info.
  10. If fault persists after wiring and software checks, consider module bench testing or replacement following manufacturer procedures; clear codes and retest to confirm.

Likely causes

  • Battery voltage below acceptable threshold (weak or discharged battery)
  • Intermittent connection at battery positive or ground causing voltage drop
  • Faulty rundown relay/FET or its control circuit in the BCM
  • Aftermarket accessory causing excessive drain or a short to ground
  • Corroded connector or damaged harness between battery and BCM
  • BCM software fault requiring reprogramming or module replacement

Fault status

⚠️ Status
BCM detected low voltage on the Battery Rundown Protection circuit. Non‑essential loads may be disabled to protect the battery. Inspect battery, connections, fuses, and BCM power/ground.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1481 B1483 U0100 U0121 P0562
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