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Home / DTC / B1235 — Window door glass feedback, failure

B1235 — Window door glass feedback, failure

Detailed page for trouble code B1235.

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Code

B1235

LAND ROVER B — Body

Window door glass feedback, failure

Brand: LAND ROVER
Type: B — Body
Views: UK: 4 EN: 11 RU: 7
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty window position/feedback sensor (encoder or Hall sensor)
  • Failed window motor or regulator (mechanical binding or broken gear)
  • Open/short/corroded wiring or connectors between glass sensor, motor and door module
  • Faulty Door Module / BCM (central junction/comfort module) or poor ground
  • Obstruction or mechanical jam preventing expected travel/feedback
  • Software fault or lost configuration/calibration in the door module

Symptoms

  • Window does not respond to switch or moves erratically
  • Window stops before reaching expected position or reverses unexpectedly
  • Auto-up/auto-down functions unavailable or behave unpredictably
  • Diagnostic tool shows B1235 stored in door module/BCM
  • Noise from motor or binding during travel

What to check

  • Retrieve faults from all body/door modules with a capable scan tool and note freeze frame data and occurrence counter
  • Confirm vehicle battery voltage stable (12V nominal) during tests
  • Visually inspect door wiring harness, connectors and seals for corrosion, pin damage or water ingress
  • Operate window while watching connector pins and wiring for intermittent movement/voltage change
  • Check for mechanical binding: remove door trim and inspect regulator, guide channels and glass seating
  • Check motor current draw while moving the window (compare to known good or spec range)

Signal parameters

  • Supply voltage to motor/module: ~12 V (vehicle battery voltage) while operating
  • Ground resistance from module ground to chassis:
  • Motor current: typically 2–10 A during normal travel (spikes higher on start or binding)
  • Position/feedback sensor output: 0–5 V analog or pulse/encoder signal — should change smoothly as window moves
  • CAN/LIN: door module may transmit/window status messages periodically (check for valid messages and no bus errors)
  • Switch input: contact closure to module when switch actuated (digital high/low)

Diagnostic algorithm

  1. Connect a diagnostic scan tool; read and record B1235 and any related codes from door module/BCM. Note freeze frame and occurrence history.
  2. Verify battery voltage and health. Clear codes, attempt a window operation and see if B1235 immediately returns.
  3. Inspect door trim, connectors and wiring for corrosion, pin damage or water entry. Repair any physical damage and reseal as required.
  4. With the door trim off, operate the window while observing motor, regulator and glass travel. Look for binding, broken cables or debris obstructing movement.
  5. Probe at the module connector: verify supply voltage present during operation, good ground, switch input signals and feedback sensor output behavior (voltage or pulses change with movement).
  6. Measure motor current during travel. High current or stalled condition indicates mechanical/regulator fault. Low/no current with correct commands suggests wiring or module output fault.
  7. If wiring and motor/regulator check OK, perform module recalibration/initialization per factory procedure (some systems require relearn after battery disconnect or repair).
  8. If feedback signal abnormal and wiring/motor good, replace the feedback sensor or regulator assembly as applicable.
  9. If all components test good but code persists, check module software and CAN/LIN communications; update/reflash software if available and recommended.
  10. After repair or replacement, clear codes and perform function test and calibration. Re-scan to confirm B1235 does not return.

Likely causes

  • Corroded/damaged connector or wiring in the door harness (most common)
  • Failed or intermittent window position sensor/encoder
  • Window motor or regulator binding or excessive current draw causing incorrect feedback
  • Module calibration lost after service or battery disconnect
  • Faulty door module/BCM (least common)

Fault status

⚠️ Status
Door module reports window glass feedback failure — glass position signal invalid or missing. May cause inoperative or unpredictable window operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1234 B1236 B1240 B1250 B1260
Workshop Manuals

Repair manuals for LAND ROVER

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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
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  • 19 FUEL SYSTEM Tdi
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Short description

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199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
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  • - Recommended sealants
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Workshop Manual
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Short description

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199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
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  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
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  • 1.11 Wire colour codes
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Code

B1235

MERCEDES-BENZ B — Body

Emissions sensor (B31)

Brand: MERCEDES-BENZ
Type: B — Body
Views: UK: 12 EN: 17 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty window position/feedback sensor (encoder or Hall sensor)
  • Failed window motor or regulator (mechanical binding or broken gear)
  • Open/short/corroded wiring or connectors between glass sensor, motor and door module
  • Faulty Door Module / BCM (central junction/comfort module) or poor ground
  • Obstruction or mechanical jam preventing expected travel/feedback
  • Software fault or lost configuration/calibration in the door module

Symptoms

  • Window does not respond to switch or moves erratically
  • Window stops before reaching expected position or reverses unexpectedly
  • Auto-up/auto-down functions unavailable or behave unpredictably
  • Diagnostic tool shows B1235 stored in door module/BCM
  • Noise from motor or binding during travel

What to check

  • Retrieve faults from all body/door modules with a capable scan tool and note freeze frame data and occurrence counter
  • Confirm vehicle battery voltage stable (12V nominal) during tests
  • Visually inspect door wiring harness, connectors and seals for corrosion, pin damage or water ingress
  • Operate window while watching connector pins and wiring for intermittent movement/voltage change
  • Check for mechanical binding: remove door trim and inspect regulator, guide channels and glass seating
  • Check motor current draw while moving the window (compare to known good or spec range)

Signal parameters

  • Supply voltage to motor/module: ~12 V (vehicle battery voltage) while operating
  • Ground resistance from module ground to chassis:
  • Motor current: typically 2–10 A during normal travel (spikes higher on start or binding)
  • Position/feedback sensor output: 0–5 V analog or pulse/encoder signal — should change smoothly as window moves
  • CAN/LIN: door module may transmit/window status messages periodically (check for valid messages and no bus errors)
  • Switch input: contact closure to module when switch actuated (digital high/low)

Diagnostic algorithm

  1. Connect a diagnostic scan tool; read and record B1235 and any related codes from door module/BCM. Note freeze frame and occurrence history.
  2. Verify battery voltage and health. Clear codes, attempt a window operation and see if B1235 immediately returns.
  3. Inspect door trim, connectors and wiring for corrosion, pin damage or water entry. Repair any physical damage and reseal as required.
  4. With the door trim off, operate the window while observing motor, regulator and glass travel. Look for binding, broken cables or debris obstructing movement.
  5. Probe at the module connector: verify supply voltage present during operation, good ground, switch input signals and feedback sensor output behavior (voltage or pulses change with movement).
  6. Measure motor current during travel. High current or stalled condition indicates mechanical/regulator fault. Low/no current with correct commands suggests wiring or module output fault.
  7. If wiring and motor/regulator check OK, perform module recalibration/initialization per factory procedure (some systems require relearn after battery disconnect or repair).
  8. If feedback signal abnormal and wiring/motor good, replace the feedback sensor or regulator assembly as applicable.
  9. If all components test good but code persists, check module software and CAN/LIN communications; update/reflash software if available and recommended.
  10. After repair or replacement, clear codes and perform function test and calibration. Re-scan to confirm B1235 does not return.

Likely causes

  • Corroded/damaged connector or wiring in the door harness (most common)
  • Failed or intermittent window position sensor/encoder
  • Window motor or regulator binding or excessive current draw causing incorrect feedback
  • Module calibration lost after service or battery disconnect
  • Faulty door module/BCM (least common)

Fault status

⚠️ Status
Door module reports window glass feedback failure — glass position signal invalid or missing. May cause inoperative or unpredictable window operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1234 B1236 B1240 B1250 B1260
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1235

Other B — Body

Window Feedback Failure

Brand: Other
Type: B — Body
Views: UK: 22 EN: 31 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty window position/feedback sensor (encoder or Hall sensor)
  • Failed window motor or regulator (mechanical binding or broken gear)
  • Open/short/corroded wiring or connectors between glass sensor, motor and door module
  • Faulty Door Module / BCM (central junction/comfort module) or poor ground
  • Obstruction or mechanical jam preventing expected travel/feedback
  • Software fault or lost configuration/calibration in the door module

Symptoms

  • Window does not respond to switch or moves erratically
  • Window stops before reaching expected position or reverses unexpectedly
  • Auto-up/auto-down functions unavailable or behave unpredictably
  • Diagnostic tool shows B1235 stored in door module/BCM
  • Noise from motor or binding during travel

What to check

  • Retrieve faults from all body/door modules with a capable scan tool and note freeze frame data and occurrence counter
  • Confirm vehicle battery voltage stable (12V nominal) during tests
  • Visually inspect door wiring harness, connectors and seals for corrosion, pin damage or water ingress
  • Operate window while watching connector pins and wiring for intermittent movement/voltage change
  • Check for mechanical binding: remove door trim and inspect regulator, guide channels and glass seating
  • Check motor current draw while moving the window (compare to known good or spec range)

Signal parameters

  • Supply voltage to motor/module: ~12 V (vehicle battery voltage) while operating
  • Ground resistance from module ground to chassis:
  • Motor current: typically 2–10 A during normal travel (spikes higher on start or binding)
  • Position/feedback sensor output: 0–5 V analog or pulse/encoder signal — should change smoothly as window moves
  • CAN/LIN: door module may transmit/window status messages periodically (check for valid messages and no bus errors)
  • Switch input: contact closure to module when switch actuated (digital high/low)

Diagnostic algorithm

  1. Connect a diagnostic scan tool; read and record B1235 and any related codes from door module/BCM. Note freeze frame and occurrence history.
  2. Verify battery voltage and health. Clear codes, attempt a window operation and see if B1235 immediately returns.
  3. Inspect door trim, connectors and wiring for corrosion, pin damage or water entry. Repair any physical damage and reseal as required.
  4. With the door trim off, operate the window while observing motor, regulator and glass travel. Look for binding, broken cables or debris obstructing movement.
  5. Probe at the module connector: verify supply voltage present during operation, good ground, switch input signals and feedback sensor output behavior (voltage or pulses change with movement).
  6. Measure motor current during travel. High current or stalled condition indicates mechanical/regulator fault. Low/no current with correct commands suggests wiring or module output fault.
  7. If wiring and motor/regulator check OK, perform module recalibration/initialization per factory procedure (some systems require relearn after battery disconnect or repair).
  8. If feedback signal abnormal and wiring/motor good, replace the feedback sensor or regulator assembly as applicable.
  9. If all components test good but code persists, check module software and CAN/LIN communications; update/reflash software if available and recommended.
  10. After repair or replacement, clear codes and perform function test and calibration. Re-scan to confirm B1235 does not return.

Likely causes

  • Corroded/damaged connector or wiring in the door harness (most common)
  • Failed or intermittent window position sensor/encoder
  • Window motor or regulator binding or excessive current draw causing incorrect feedback
  • Module calibration lost after service or battery disconnect
  • Faulty door module/BCM (least common)

Fault status

⚠️ Status
Door module reports window glass feedback failure — glass position signal invalid or missing. May cause inoperative or unpredictable window operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1234 B1236 B1240 B1250 B1260
Workshop Manuals

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Short description

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Contents
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  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
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  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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