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Home / DTC / B1B93 — recline the speed / motor position sensor

B1B93 — recline the speed / motor position sensor

Detailed page for trouble code B1B93.

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22,461specific
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Code

B1B93

LAND ROVER B — Body

recline the speed / motor position sensor

Brand: LAND ROVER
Type: B — Body
Views: UK: 15 EN: 25 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty recline motor position or speed sensor (potentiometer or Hall sensor)
  • Open, short or corroded wiring or connector at the sensor or seat control module
  • Poor ground or missing reference voltage to the sensor
  • Mechanical binding or excessive friction in the recline mechanism
  • Faulty seat control module (SCM) or recline motor driver
  • Water ingress or contamination in the seat harness or connector

Symptoms

  • Seat back will not recline or will stop unexpectedly
  • Recline movement is slow, jerky or inconsistent
  • Seat memory or automatic seating functions may not operate correctly
  • DTC stored in seat or body control module and possible cockpit warning/message
  • Intermittent operation that may change when seat is moved/wiggled

What to check

  • Read and record all stored DTCs and freeze-frame data from seat and body modules
  • Perform a visual inspection of the seat wiring harness, connectors and sensor for damage or corrosion
  • Operate the recline function while observing connector and wiring for intermittent faults (wiggle test)
  • Check for applicable Technical Service Bulletins or calibration procedures
  • Verify power (reference voltage), ground and signal at the recline sensor connector with ignition on
  • Use a scope or DVOM to observe sensor output while operating the seat

Signal parameters

  • Typical sensor reference: +5 V (verify against vehicle wiring diagram)
  • Signal output: varies with position — commonly ~0.5–4.5 V for potentiometer-type sensors
  • For Hall-effect speed sensors: signal is a square wave; frequency increases with motor speed
  • Signal should be steady when stationary and change smoothly with movement (no sudden jumps or dropouts)
  • No-load recline motor current should be within manufacturer specification; excessive current suggests binding

Diagnostic algorithm

  1. Retrieve all related fault codes and freeze-frame data from the seat control module and body module. Note when the fault occurs (e.g., during movement).
  2. Visually inspect the recline motor, sensor and harness for damage, chafing, corrosion, or water ingress. Check connector pins for bent or pushed-out terminals.
  3. With ignition on, back-probe the sensor connector and verify reference voltage and ground are present and within spec.
  4. Operate the recline function while monitoring the sensor signal with a scope or multimeter. Confirm the signal changes smoothly and remains within expected voltage/frequency range.
  5. Wiggle harness and connectors while operating the seat to reproduce intermittent faults. If fault occurs, repair wiring/connectors.
  6. Measure recline motor current during operation. High current or stalling indicates mechanical binding — inspect and free or replace mechanical components as required.
  7. If wiring and motor check good but signal is out of range or erratic, replace the recline position/speed sensor and retest.
  8. If sensor replacement does not clear the fault, inspect/replace the seat control module or recline motor driver. Reprogram or perform seat calibration/learn procedure if required.
  9. Clear codes and perform functional test and road/operational verification. Confirm the fault does not reappear.

Likely causes

  • Connector corrosion or loose connector at the recline motor/sensor
  • Open/short in the sensor signal or reference wiring caused by seat movement
  • Failed recline position potentiometer or Hall-effect sensor
  • Mechanical obstruction causing extreme or noisy feedback
  • Faulty seat control module or internal driver electronics

Fault status

⚠️ Status
Recline motor position/speed sensor signal out of range or intermittent — recline feedback fault recorded by seat control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1B92 B1B94 B1B95 B1B96 B1234
160

Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

B1B93

MITSUBISHI B — Body

PS.seat track POS.sensor low

Brand: MITSUBISHI
Type: B — Body
Views: UK: 14 EN: 26 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty recline motor position or speed sensor (potentiometer or Hall sensor)
  • Open, short or corroded wiring or connector at the sensor or seat control module
  • Poor ground or missing reference voltage to the sensor
  • Mechanical binding or excessive friction in the recline mechanism
  • Faulty seat control module (SCM) or recline motor driver
  • Water ingress or contamination in the seat harness or connector

Symptoms

  • Seat back will not recline or will stop unexpectedly
  • Recline movement is slow, jerky or inconsistent
  • Seat memory or automatic seating functions may not operate correctly
  • DTC stored in seat or body control module and possible cockpit warning/message
  • Intermittent operation that may change when seat is moved/wiggled

What to check

  • Read and record all stored DTCs and freeze-frame data from seat and body modules
  • Perform a visual inspection of the seat wiring harness, connectors and sensor for damage or corrosion
  • Operate the recline function while observing connector and wiring for intermittent faults (wiggle test)
  • Check for applicable Technical Service Bulletins or calibration procedures
  • Verify power (reference voltage), ground and signal at the recline sensor connector with ignition on
  • Use a scope or DVOM to observe sensor output while operating the seat

Signal parameters

  • Typical sensor reference: +5 V (verify against vehicle wiring diagram)
  • Signal output: varies with position — commonly ~0.5–4.5 V for potentiometer-type sensors
  • For Hall-effect speed sensors: signal is a square wave; frequency increases with motor speed
  • Signal should be steady when stationary and change smoothly with movement (no sudden jumps or dropouts)
  • No-load recline motor current should be within manufacturer specification; excessive current suggests binding

Diagnostic algorithm

  1. Retrieve all related fault codes and freeze-frame data from the seat control module and body module. Note when the fault occurs (e.g., during movement).
  2. Visually inspect the recline motor, sensor and harness for damage, chafing, corrosion, or water ingress. Check connector pins for bent or pushed-out terminals.
  3. With ignition on, back-probe the sensor connector and verify reference voltage and ground are present and within spec.
  4. Operate the recline function while monitoring the sensor signal with a scope or multimeter. Confirm the signal changes smoothly and remains within expected voltage/frequency range.
  5. Wiggle harness and connectors while operating the seat to reproduce intermittent faults. If fault occurs, repair wiring/connectors.
  6. Measure recline motor current during operation. High current or stalling indicates mechanical binding — inspect and free or replace mechanical components as required.
  7. If wiring and motor check good but signal is out of range or erratic, replace the recline position/speed sensor and retest.
  8. If sensor replacement does not clear the fault, inspect/replace the seat control module or recline motor driver. Reprogram or perform seat calibration/learn procedure if required.
  9. Clear codes and perform functional test and road/operational verification. Confirm the fault does not reappear.

Likely causes

  • Connector corrosion or loose connector at the recline motor/sensor
  • Open/short in the sensor signal or reference wiring caused by seat movement
  • Failed recline position potentiometer or Hall-effect sensor
  • Mechanical obstruction causing extreme or noisy feedback
  • Faulty seat control module or internal driver electronics

Fault status

⚠️ Status
Recline motor position/speed sensor signal out of range or intermittent — recline feedback fault recorded by seat control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1B92 B1B94 B1B95 B1B96 B1234
203

Browse 203 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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

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