Code
B1077
LAND ROVER
B — Body
Front lock sensor closure
Views:
UK: 4
EN: 9
RU: 6
AI status
Completed
Completed
100%
Causes
- Damaged or corroded front lock sensor (switch)
- Wiring short to ground or to battery in the sensor harness
- Poor connector contact or corrosion at the sensor connector
- Water ingress or contamination in lock assembly
- Failed door lock actuator with internal short affecting the sensor circuit
- Faulty Body Control Module (BCM) or module input pin fault
Symptoms
- Central locking behaves incorrectly (locks/unlocks unexpectedly)
- Door ajar lamp or message remains on for front door
- Front door may not lock or unlock from remote/central lock reliably
- Alarm triggers falsely or does not arm correctly
- Intermittent or permanent loss of front door open/close feedback
- Possible parasitic battery drain if circuit is shorted
What to check
- Visually inspect front door lock assembly, harness and connector for corrosion, damage, and water ingress
- Check for presence of related active/inactive codes in BCM and UCE using diagnostic scanner
- Operate the lock while watching live data for the front lock sensor input on a diagnostic tool
- Disconnect the front lock sensor connector and check if code clears or a different fault appears (use safe procedures)
- Perform a wiggle test of the wiring harness while watching sensor status for intermittent faults
- Inspect for aftermarket alarm or wiring splices near the door and B-pillar
Signal parameters
- Typical sensor behavior: closed = near 0 V (or near chassis ground) on the signal line; open = reference voltage (vehicle specific; often 5V or battery voltage through pull-up)
- Expected resistance across a mechanical switch when closed: very low (>1 kΩ)
- Live-data signal should change state promptly when lock actuator is operated (no slow drift or bouncing)
- Reference voltage and exact thresholds are model/year specific — consult vehicle wiring diagram and diagnostic data
Diagnostic algorithm
- Connect a diagnostic scanner and confirm B1077 and any related codes; record freeze frame and live-data for front lock sensor input
- Visually inspect connector and wiring at the front door lock for corrosion, broken wires, pin damage and moisture; repair as needed
- With ignition on, measure voltage at the sensor harness connector: note signal voltage with door closed and while operating lock; compare to expected values from wiring diagram
- If wiring present safe access, disconnect the sensor connector and check sensor resistance directly (with lock in closed and open positions) to confirm mechanical switch function
- Perform a continuity check from the sensor signal pin back to the BCM input to detect shorts to ground or power and to confirm circuit integrity
- If wiring and connector are good but the sensor shows closed while disconnected, replace the sensor/lock assembly
- If intermittent, flex the door harness while monitoring live-data to reproduce the fault, repair broken wires or install conduit/repair section
- After repair or replacement, clear codes and cycle locks several times and re-scan to ensure B1077 does not return
- If wiring and sensor are verified good and fault persists, consider BCM input fault and consult manufacturer procedures for BCM testing or replacement
Likely causes
- Corroded/contaminated sensor connector or pin causing permanent closed reading
- Broken insulation causing sensor signal wire to short to ground
- Failed mechanical sensor inside front lock assembly
- Water or debris in lock causing sensor to stick closed
- Intermittent wiring break where harness flex causes closure to be seen as a fault
Fault status
Status
Front lock sensor circuit - closed condition detected (front door lock sensor reporting continuous closure).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1
LAND ROVER 2015 Discovery Sport HSE
HTML ManualWorkshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
B1077
MITSUBISHI
B — Body
R.air outlet travel too large
Views:
UK: 5
EN: 9
RU: 7
AI status
Completed
Completed
100%
Causes
- Damaged or corroded front lock sensor (switch)
- Wiring short to ground or to battery in the sensor harness
- Poor connector contact or corrosion at the sensor connector
- Water ingress or contamination in lock assembly
- Failed door lock actuator with internal short affecting the sensor circuit
- Faulty Body Control Module (BCM) or module input pin fault
Symptoms
- Central locking behaves incorrectly (locks/unlocks unexpectedly)
- Door ajar lamp or message remains on for front door
- Front door may not lock or unlock from remote/central lock reliably
- Alarm triggers falsely or does not arm correctly
- Intermittent or permanent loss of front door open/close feedback
- Possible parasitic battery drain if circuit is shorted
What to check
- Visually inspect front door lock assembly, harness and connector for corrosion, damage, and water ingress
- Check for presence of related active/inactive codes in BCM and UCE using diagnostic scanner
- Operate the lock while watching live data for the front lock sensor input on a diagnostic tool
- Disconnect the front lock sensor connector and check if code clears or a different fault appears (use safe procedures)
- Perform a wiggle test of the wiring harness while watching sensor status for intermittent faults
- Inspect for aftermarket alarm or wiring splices near the door and B-pillar
Signal parameters
- Typical sensor behavior: closed = near 0 V (or near chassis ground) on the signal line; open = reference voltage (vehicle specific; often 5V or battery voltage through pull-up)
- Expected resistance across a mechanical switch when closed: very low (>1 kΩ)
- Live-data signal should change state promptly when lock actuator is operated (no slow drift or bouncing)
- Reference voltage and exact thresholds are model/year specific — consult vehicle wiring diagram and diagnostic data
Diagnostic algorithm
- Connect a diagnostic scanner and confirm B1077 and any related codes; record freeze frame and live-data for front lock sensor input
- Visually inspect connector and wiring at the front door lock for corrosion, broken wires, pin damage and moisture; repair as needed
- With ignition on, measure voltage at the sensor harness connector: note signal voltage with door closed and while operating lock; compare to expected values from wiring diagram
- If wiring present safe access, disconnect the sensor connector and check sensor resistance directly (with lock in closed and open positions) to confirm mechanical switch function
- Perform a continuity check from the sensor signal pin back to the BCM input to detect shorts to ground or power and to confirm circuit integrity
- If wiring and connector are good but the sensor shows closed while disconnected, replace the sensor/lock assembly
- If intermittent, flex the door harness while monitoring live-data to reproduce the fault, repair broken wires or install conduit/repair section
- After repair or replacement, clear codes and cycle locks several times and re-scan to ensure B1077 does not return
- If wiring and sensor are verified good and fault persists, consider BCM input fault and consult manufacturer procedures for BCM testing or replacement
Likely causes
- Corroded/contaminated sensor connector or pin causing permanent closed reading
- Broken insulation causing sensor signal wire to short to ground
- Failed mechanical sensor inside front lock assembly
- Water or debris in lock causing sensor to stick closed
- Intermittent wiring break where harness flex causes closure to be seen as a fault
Fault status
Status
Front lock sensor circuit - closed condition detected (front door lock sensor reporting continuous closure).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email