Code
B1802
HUMMER
B — Body
Inadv. Pwr Short to Ground
Views:
UK: 9
EN: 21
RU: 11
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring contacting chassis ground
- Corroded or bent connector terminals creating a short
- Failed switch or relay internally shorting to ground
- Aftermarket accessory wired incorrectly to a power feed
- Water intrusion causing cross‑connection between power and ground
- Shorted component (lamp, motor, sensor) in the affected circuit
Symptoms
- Circuit fuse(s) blowing or recurring fuse failure
- One or more body systems (lights, windows, locks) inoperative or intermittent
- Parasitic battery drain when vehicle is off
- Vehicle stores B1802 or related body electrical DTCs
- Visual signs of heat, melting, or burning smell near wiring or a component
What to check
- Scan vehicle and record all stored/active DTCs and freeze frame data
- Visually inspect wiring harnesses, routing, and connectors for damage, corrosion, or chafing
- Check and record battery voltage and charging system health
- Inspect relevant fuses and fusible links for signs of overheating or corrosion
- Check ground straps and battery/engine/chassis grounds for tightness and corrosion
- Verify any recent aftermarket installations and their wiring connections
Signal parameters
- Expected battery voltage on power feed: ~12.0–14.5 V with engine running
- Open circuit reading (no short) when power is removed: very high resistance / infinite
- Short-circuit resistance to ground: typically very low — often
- Parasitic draw normal at rest: usually
- Fuse current rating for affected circuit: check specification in wiring diagram and note if fuse blows at or below rated value
Diagnostic algorithm
- Retrieve and document all codes and current symptom conditions with a scan tool
- Visually inspect areas where wiring is routed through doors, hood hinges, trunk, and near body panels for chafing or pinching
- Remove/replace the suspect circuit fuse(s) and observe if immediate blow occurs — do not repeatedly reinstall without diagnosing
- If fuse blows, isolate the circuit by disconnecting connectors/modules downstream of the fuse one at a time until the short clears (fuse no longer blows) to identify the offending segment
- Use a fused jumper or 12 V fused supply and an inline ammeter or a clamp meter to measure current and narrow the location of the short (work from load toward power source)
- Use a low-voltage continuity/ohmmeter to check for low resistance between the power feed and chassis ground with the circuit de‑energized — trace wiring to find point of contact
- Inspect connectors and components unplugged from the isolated circuit for internal damage or signs of overheating; wiggle harness while monitoring to reproduce intermittent shorts
- If wiring and connectors check OK, consider module replacement only after verifying wiring and grounds; follow manufacturer procedures when replacing BCM or other control modules
- Repair damaged wiring by replacing or repairing with proper automotive‑grade heat‑shrink solder joints or crimp connectors, route and secure harness away from pinch points, and recoat with loom/insulation; clear codes and test operation
Likely causes
- Wiring harness abrasion at hinge points or routing clips
- Loose or damaged ground strap contacting power conductor
- Blown fuse or repeated fuse failures indicating high current short
- Connector pin pushed out and contacting ground or adjacent pins
- Aftermarket audio/security installation tied into incorrect power source
Fault status
Status
Inadvertent power short to ground detected on a body electrical circuit. Power feed is being unintentionally grounded; inspect wiring, connectors, fuses and modules.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
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Code
B1802
Other
B — Body
Lamp Turn Signal Rear Output Circuit Failure
Views:
UK: 19
EN: 37
RU: 26
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring contacting chassis ground
- Corroded or bent connector terminals creating a short
- Failed switch or relay internally shorting to ground
- Aftermarket accessory wired incorrectly to a power feed
- Water intrusion causing cross‑connection between power and ground
- Shorted component (lamp, motor, sensor) in the affected circuit
Symptoms
- Circuit fuse(s) blowing or recurring fuse failure
- One or more body systems (lights, windows, locks) inoperative or intermittent
- Parasitic battery drain when vehicle is off
- Vehicle stores B1802 or related body electrical DTCs
- Visual signs of heat, melting, or burning smell near wiring or a component
What to check
- Scan vehicle and record all stored/active DTCs and freeze frame data
- Visually inspect wiring harnesses, routing, and connectors for damage, corrosion, or chafing
- Check and record battery voltage and charging system health
- Inspect relevant fuses and fusible links for signs of overheating or corrosion
- Check ground straps and battery/engine/chassis grounds for tightness and corrosion
- Verify any recent aftermarket installations and their wiring connections
Signal parameters
- Expected battery voltage on power feed: ~12.0–14.5 V with engine running
- Open circuit reading (no short) when power is removed: very high resistance / infinite
- Short-circuit resistance to ground: typically very low — often
- Parasitic draw normal at rest: usually
- Fuse current rating for affected circuit: check specification in wiring diagram and note if fuse blows at or below rated value
Diagnostic algorithm
- Retrieve and document all codes and current symptom conditions with a scan tool
- Visually inspect areas where wiring is routed through doors, hood hinges, trunk, and near body panels for chafing or pinching
- Remove/replace the suspect circuit fuse(s) and observe if immediate blow occurs — do not repeatedly reinstall without diagnosing
- If fuse blows, isolate the circuit by disconnecting connectors/modules downstream of the fuse one at a time until the short clears (fuse no longer blows) to identify the offending segment
- Use a fused jumper or 12 V fused supply and an inline ammeter or a clamp meter to measure current and narrow the location of the short (work from load toward power source)
- Use a low-voltage continuity/ohmmeter to check for low resistance between the power feed and chassis ground with the circuit de‑energized — trace wiring to find point of contact
- Inspect connectors and components unplugged from the isolated circuit for internal damage or signs of overheating; wiggle harness while monitoring to reproduce intermittent shorts
- If wiring and connectors check OK, consider module replacement only after verifying wiring and grounds; follow manufacturer procedures when replacing BCM or other control modules
- Repair damaged wiring by replacing or repairing with proper automotive‑grade heat‑shrink solder joints or crimp connectors, route and secure harness away from pinch points, and recoat with loom/insulation; clear codes and test operation
Likely causes
- Wiring harness abrasion at hinge points or routing clips
- Loose or damaged ground strap contacting power conductor
- Blown fuse or repeated fuse failures indicating high current short
- Connector pin pushed out and contacting ground or adjacent pins
- Aftermarket audio/security installation tied into incorrect power source
Fault status
Status
Inadvertent power short to ground detected on a body electrical circuit. Power feed is being unintentionally grounded; inspect wiring, connectors, fuses and modules.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
1
LAND ROVER 1
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
Key sections:
Buy - 01 - INTRODUCTION
- - Introduction
- - Dimensions
- - References
- - Repairs and replacements
- - Poisonous substances
- - Fuel handling precautions
- - Synthetic rubber
- - Recommended sealants
- - Used engine oil precautions
- - Accessories and conversions
- - Wheels and tyres
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