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Home / DTC / B1480 — Battery Rundown Protection Circuit Malfunction

B1480 — Battery Rundown Protection Circuit Malfunction

Detailed page for trouble code B1480.

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22,491specific
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Code

B1480

HUMMER B — Body

Battery Rundown Protection Circuit Malfunction

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

Causes

  • Blown or corroded fuse(s) in the BRP or body electrical circuits
  • Failed BRP relay or control module
  • Faulty Body Control Module (BCM) or related software fault
  • Open, short, or high-resistance wiring or connector fault in BRP harness
  • Poor battery condition or low battery voltage
  • Poor or corroded ground(s)

Symptoms

  • Battery warning lamp or message on dash
  • Accessories shutting off unexpectedly or not functioning after key-off timer
  • Battery discharging overnight or reduced cranking capacity
  • No crank or intermittent starting issues if BRP prevents accessory power
  • Stored or pending DTCs related to body electrical and battery systems
  • Erratic accessory behavior (intermittent radio, interior lights)

What to check

  • Connect a scan tool and read all stored/ pending codes from BCM and related modules. Record freeze frame data if present.
  • Measure static battery voltage (key off) and charging voltage (engine running).
  • Visually inspect fuses, relays, BRP relay socket, and connectors for corrosion, heat damage or looseness.
  • Perform a battery load test or capacity check to confirm battery health.
  • Measure parasitic draw with all doors closed and ignition off (expected
  • Backprobe BRP control and feedback circuits while toggling BRP functions with scan tool to verify signal presence and response.

Signal parameters

  • Resting battery voltage: approximately 12.4–12.8 V (fully charged).
  • Charging system voltage (engine running): approximately 13.5–14.8 V.
  • Parasitic draw (key off, module sleep): typically
  • BRP control output: should switch between ~0 V (off) and battery voltage (~12 V) depending on command.
  • Harness/ground continuity: chassis ground resistance
  • Open-circuit indication: very high resistance or infinite ohms on continuity check in affected circuit.

Diagnostic algorithm

  1. Retrieve all DTCs from BCM and other modules; note occurrence and freeze-frame. Clear codes and attempt to re-create to confirm persistence.
  2. Verify battery state of charge and perform a battery load test. Replace or fully charge if battery below spec before further testing.
  3. Inspect fuses and relays specific to BRP and accessory circuits. Replace any suspect fusible links or relays and retest.
  4. Visually inspect wiring and connectors for damage, corrosion, bent pins or water intrusion at BRP relay, BCM and battery/ground points.
  5. Using a DVOM or lab scope, backprobe the BRP control and feedback wires. Command BRP on/off with a scan tool and observe voltage transitions and response time.
  6. Perform a parasitic draw test to identify if a particular circuit is drawing excessive current. Isolate loads by removing fuses/relays to find the source.
  7. Check ground integrity: measure voltage drop across ground while under load and perform continuity checks to chassis.
  8. If wiring and battery are good but fault persists, attempt swap/ substitution of BRP relay (if serviceable) or known-good BCM/BRP module per service manual procedures.
  9. Verify BCM software calibration level; update BCM/BCP software if Technical Service Bulletin or update is available and applicable.
  10. After repair, clear codes and perform a road test and soak/sleep cycles to confirm the BRP system behaves correctly and codes do not return.

Likely causes

  • Open circuit or short in BRP control wire or ground
  • Failed BRP relay or solenoid that switches accessory power
  • BCM not commanding or not receiving feedback from BRP circuit
  • Battery unable to provide required voltage causing erroneous BRP readings
  • Corroded connector at BRP relay/module or at the battery/ground

Fault status

⚠️ Status
Battery Rundown Protection Circuit Malfunction — BRP circuit reported open/short or incorrect operation; possible battery drain or accessory shutdown.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1481 B1479 B1500 P0562 U0100
Repair manuals

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Code

B1480

MITSUBISHI B — Body

F ABG(2)DR squib short

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

Causes

  • Blown or corroded fuse(s) in the BRP or body electrical circuits
  • Failed BRP relay or control module
  • Faulty Body Control Module (BCM) or related software fault
  • Open, short, or high-resistance wiring or connector fault in BRP harness
  • Poor battery condition or low battery voltage
  • Poor or corroded ground(s)

Symptoms

  • Battery warning lamp or message on dash
  • Accessories shutting off unexpectedly or not functioning after key-off timer
  • Battery discharging overnight or reduced cranking capacity
  • No crank or intermittent starting issues if BRP prevents accessory power
  • Stored or pending DTCs related to body electrical and battery systems
  • Erratic accessory behavior (intermittent radio, interior lights)

What to check

  • Connect a scan tool and read all stored/ pending codes from BCM and related modules. Record freeze frame data if present.
  • Measure static battery voltage (key off) and charging voltage (engine running).
  • Visually inspect fuses, relays, BRP relay socket, and connectors for corrosion, heat damage or looseness.
  • Perform a battery load test or capacity check to confirm battery health.
  • Measure parasitic draw with all doors closed and ignition off (expected
  • Backprobe BRP control and feedback circuits while toggling BRP functions with scan tool to verify signal presence and response.

Signal parameters

  • Resting battery voltage: approximately 12.4–12.8 V (fully charged).
  • Charging system voltage (engine running): approximately 13.5–14.8 V.
  • Parasitic draw (key off, module sleep): typically
  • BRP control output: should switch between ~0 V (off) and battery voltage (~12 V) depending on command.
  • Harness/ground continuity: chassis ground resistance
  • Open-circuit indication: very high resistance or infinite ohms on continuity check in affected circuit.

Diagnostic algorithm

  1. Retrieve all DTCs from BCM and other modules; note occurrence and freeze-frame. Clear codes and attempt to re-create to confirm persistence.
  2. Verify battery state of charge and perform a battery load test. Replace or fully charge if battery below spec before further testing.
  3. Inspect fuses and relays specific to BRP and accessory circuits. Replace any suspect fusible links or relays and retest.
  4. Visually inspect wiring and connectors for damage, corrosion, bent pins or water intrusion at BRP relay, BCM and battery/ground points.
  5. Using a DVOM or lab scope, backprobe the BRP control and feedback wires. Command BRP on/off with a scan tool and observe voltage transitions and response time.
  6. Perform a parasitic draw test to identify if a particular circuit is drawing excessive current. Isolate loads by removing fuses/relays to find the source.
  7. Check ground integrity: measure voltage drop across ground while under load and perform continuity checks to chassis.
  8. If wiring and battery are good but fault persists, attempt swap/ substitution of BRP relay (if serviceable) or known-good BCM/BRP module per service manual procedures.
  9. Verify BCM software calibration level; update BCM/BCP software if Technical Service Bulletin or update is available and applicable.
  10. After repair, clear codes and perform a road test and soak/sleep cycles to confirm the BRP system behaves correctly and codes do not return.

Likely causes

  • Open circuit or short in BRP control wire or ground
  • Failed BRP relay or solenoid that switches accessory power
  • BCM not commanding or not receiving feedback from BRP circuit
  • Battery unable to provide required voltage causing erroneous BRP readings
  • Corroded connector at BRP relay/module or at the battery/ground

Fault status

⚠️ Status
Battery Rundown Protection Circuit Malfunction — BRP circuit reported open/short or incorrect operation; possible battery drain or accessory shutdown.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1481 B1479 B1500 P0562 U0100
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 :)
Keep it short and practical. Up to 500 characters.
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Code

B1480

Other B — Body

Wiper Washer Fluid Level Sensor Circuit Open

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

Causes

  • Blown or corroded fuse(s) in the BRP or body electrical circuits
  • Failed BRP relay or control module
  • Faulty Body Control Module (BCM) or related software fault
  • Open, short, or high-resistance wiring or connector fault in BRP harness
  • Poor battery condition or low battery voltage
  • Poor or corroded ground(s)

Symptoms

  • Battery warning lamp or message on dash
  • Accessories shutting off unexpectedly or not functioning after key-off timer
  • Battery discharging overnight or reduced cranking capacity
  • No crank or intermittent starting issues if BRP prevents accessory power
  • Stored or pending DTCs related to body electrical and battery systems
  • Erratic accessory behavior (intermittent radio, interior lights)

What to check

  • Connect a scan tool and read all stored/ pending codes from BCM and related modules. Record freeze frame data if present.
  • Measure static battery voltage (key off) and charging voltage (engine running).
  • Visually inspect fuses, relays, BRP relay socket, and connectors for corrosion, heat damage or looseness.
  • Perform a battery load test or capacity check to confirm battery health.
  • Measure parasitic draw with all doors closed and ignition off (expected
  • Backprobe BRP control and feedback circuits while toggling BRP functions with scan tool to verify signal presence and response.

Signal parameters

  • Resting battery voltage: approximately 12.4–12.8 V (fully charged).
  • Charging system voltage (engine running): approximately 13.5–14.8 V.
  • Parasitic draw (key off, module sleep): typically
  • BRP control output: should switch between ~0 V (off) and battery voltage (~12 V) depending on command.
  • Harness/ground continuity: chassis ground resistance
  • Open-circuit indication: very high resistance or infinite ohms on continuity check in affected circuit.

Diagnostic algorithm

  1. Retrieve all DTCs from BCM and other modules; note occurrence and freeze-frame. Clear codes and attempt to re-create to confirm persistence.
  2. Verify battery state of charge and perform a battery load test. Replace or fully charge if battery below spec before further testing.
  3. Inspect fuses and relays specific to BRP and accessory circuits. Replace any suspect fusible links or relays and retest.
  4. Visually inspect wiring and connectors for damage, corrosion, bent pins or water intrusion at BRP relay, BCM and battery/ground points.
  5. Using a DVOM or lab scope, backprobe the BRP control and feedback wires. Command BRP on/off with a scan tool and observe voltage transitions and response time.
  6. Perform a parasitic draw test to identify if a particular circuit is drawing excessive current. Isolate loads by removing fuses/relays to find the source.
  7. Check ground integrity: measure voltage drop across ground while under load and perform continuity checks to chassis.
  8. If wiring and battery are good but fault persists, attempt swap/ substitution of BRP relay (if serviceable) or known-good BCM/BRP module per service manual procedures.
  9. Verify BCM software calibration level; update BCM/BCP software if Technical Service Bulletin or update is available and applicable.
  10. After repair, clear codes and perform a road test and soak/sleep cycles to confirm the BRP system behaves correctly and codes do not return.

Likely causes

  • Open circuit or short in BRP control wire or ground
  • Failed BRP relay or solenoid that switches accessory power
  • BCM not commanding or not receiving feedback from BRP circuit
  • Battery unable to provide required voltage causing erroneous BRP readings
  • Corroded connector at BRP relay/module or at the battery/ground

Fault status

⚠️ Status
Battery Rundown Protection Circuit Malfunction — BRP circuit reported open/short or incorrect operation; possible battery drain or accessory shutdown.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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B1481 B1479 B1500 P0562 U0100
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