Code
B2112
HUMMER
B — Body
Lumbar Up Switch Failed
Views:
UK: 13
EN: 25
RU: 14
AI status
Completed
Completed
100%
Causes
- Defective lumbar up switch (mechanical/electrical failure)
- Open or shorted wiring between switch and seat control module
- Corroded or loose connector at the switch or module
- Faulty seat control module or internal driver circuitry
- Blown fuse or poor power/ground supply to the seat switch circuit
- Intermittent contact due to debris or wear in switch
Symptoms
- Lumbar 'up' function does not operate when switch is pressed
- Switch may feel loose, sticky, or unresponsive
- Possible DTC present with other seat related codes
- Intermittent operation or only works when moving connector/wiring
What to check
- Use a scan tool to read B2112 and any related seat/body codes; note freeze frame/data
- Visually inspect seat switch, connectors, and wiring for damage, corrosion or disconnection
- Check fuse(s) and power/ground circuits feeding the seat control and switch
- Operate the switch while monitoring for function and listen for motor/actuator noise
- Wiggle wiring and connectors while operating switch to check for intermittent faults
Signal parameters
- Reference supply to switch: ~10–14 V (vehicle battery voltage when ignition/accessory on)
- Ground: near 0 V
- Switch output: either continuity to ground or a voltage change when pressed (varies by design)
- Resistance: closed switch typically low ohms (near 0 Ω–a few ohms); open switch shows high/OL
Diagnostic algorithm
- Record freeze frame data and note any additional codes; clear codes and attempt to re-create the failure
- Perform a visual inspection of switch, harness, and connectors. Repair any obvious damage before further testing
- Verify fuses and that the seat module has proper battery voltage and ground with ignition in required position
- Backprobe the switch connector: verify reference voltage and ground are present, then actuate switch and observe output signal change (voltage or continuity)
- If no signal change, check continuity between switch output pin and seat module input pin; repair wiring or connector faults as needed
- If switch output is correct but module does not respond, check module input pins for expected signal and inspect module grounds/power; if module input sees the switch action but actuator does not move, suspect seat module driver or actuator
- If wiring and module checks are good, remove and bench-test or replace the lumbar up switch (or entire switch assembly) and retest
- After repair or replacement, clear codes and confirm correct operation under all conditions; road test or cycle multiple times to ensure fault does not return
Likely causes
- Failed or worn lumbar up switch
- Loss of reference voltage or ground to switch
- Damaged harness (pinched, chafed) between switch and seat module
- Connector corrosion or bent pins at the seat switch or module
- Seat control module output driver fault
Fault status
Status
Seat lumbar up switch circuit malfunction detected. Circuit/switch may be open, shorted, or intermittent.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
B2112
LAND ROVER
B — Body
Failure in the door actuator switch
Views:
UK: 8
EN: 18
RU: 12
AI status
Completed
Completed
100%
Causes
- Defective lumbar up switch (mechanical/electrical failure)
- Open or shorted wiring between switch and seat control module
- Corroded or loose connector at the switch or module
- Faulty seat control module or internal driver circuitry
- Blown fuse or poor power/ground supply to the seat switch circuit
- Intermittent contact due to debris or wear in switch
Symptoms
- Lumbar 'up' function does not operate when switch is pressed
- Switch may feel loose, sticky, or unresponsive
- Possible DTC present with other seat related codes
- Intermittent operation or only works when moving connector/wiring
What to check
- Use a scan tool to read B2112 and any related seat/body codes; note freeze frame/data
- Visually inspect seat switch, connectors, and wiring for damage, corrosion or disconnection
- Check fuse(s) and power/ground circuits feeding the seat control and switch
- Operate the switch while monitoring for function and listen for motor/actuator noise
- Wiggle wiring and connectors while operating switch to check for intermittent faults
Signal parameters
- Reference supply to switch: ~10–14 V (vehicle battery voltage when ignition/accessory on)
- Ground: near 0 V
- Switch output: either continuity to ground or a voltage change when pressed (varies by design)
- Resistance: closed switch typically low ohms (near 0 Ω–a few ohms); open switch shows high/OL
Diagnostic algorithm
- Record freeze frame data and note any additional codes; clear codes and attempt to re-create the failure
- Perform a visual inspection of switch, harness, and connectors. Repair any obvious damage before further testing
- Verify fuses and that the seat module has proper battery voltage and ground with ignition in required position
- Backprobe the switch connector: verify reference voltage and ground are present, then actuate switch and observe output signal change (voltage or continuity)
- If no signal change, check continuity between switch output pin and seat module input pin; repair wiring or connector faults as needed
- If switch output is correct but module does not respond, check module input pins for expected signal and inspect module grounds/power; if module input sees the switch action but actuator does not move, suspect seat module driver or actuator
- If wiring and module checks are good, remove and bench-test or replace the lumbar up switch (or entire switch assembly) and retest
- After repair or replacement, clear codes and confirm correct operation under all conditions; road test or cycle multiple times to ensure fault does not return
Likely causes
- Failed or worn lumbar up switch
- Loss of reference voltage or ground to switch
- Damaged harness (pinched, chafed) between switch and seat module
- Connector corrosion or bent pins at the seat switch or module
- Seat control module output driver fault
Fault status
Status
Seat lumbar up switch circuit malfunction detected. Circuit/switch may be open, shorted, or intermittent.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop 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
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Code
B2112
Other
B — Body
Door Driver Set Switch Stuck Failure
Views:
UK: 23
EN: 45
RU: 27
AI status
Completed
Completed
100%
Causes
- Defective lumbar up switch (mechanical/electrical failure)
- Open or shorted wiring between switch and seat control module
- Corroded or loose connector at the switch or module
- Faulty seat control module or internal driver circuitry
- Blown fuse or poor power/ground supply to the seat switch circuit
- Intermittent contact due to debris or wear in switch
Symptoms
- Lumbar 'up' function does not operate when switch is pressed
- Switch may feel loose, sticky, or unresponsive
- Possible DTC present with other seat related codes
- Intermittent operation or only works when moving connector/wiring
What to check
- Use a scan tool to read B2112 and any related seat/body codes; note freeze frame/data
- Visually inspect seat switch, connectors, and wiring for damage, corrosion or disconnection
- Check fuse(s) and power/ground circuits feeding the seat control and switch
- Operate the switch while monitoring for function and listen for motor/actuator noise
- Wiggle wiring and connectors while operating switch to check for intermittent faults
Signal parameters
- Reference supply to switch: ~10–14 V (vehicle battery voltage when ignition/accessory on)
- Ground: near 0 V
- Switch output: either continuity to ground or a voltage change when pressed (varies by design)
- Resistance: closed switch typically low ohms (near 0 Ω–a few ohms); open switch shows high/OL
Diagnostic algorithm
- Record freeze frame data and note any additional codes; clear codes and attempt to re-create the failure
- Perform a visual inspection of switch, harness, and connectors. Repair any obvious damage before further testing
- Verify fuses and that the seat module has proper battery voltage and ground with ignition in required position
- Backprobe the switch connector: verify reference voltage and ground are present, then actuate switch and observe output signal change (voltage or continuity)
- If no signal change, check continuity between switch output pin and seat module input pin; repair wiring or connector faults as needed
- If switch output is correct but module does not respond, check module input pins for expected signal and inspect module grounds/power; if module input sees the switch action but actuator does not move, suspect seat module driver or actuator
- If wiring and module checks are good, remove and bench-test or replace the lumbar up switch (or entire switch assembly) and retest
- After repair or replacement, clear codes and confirm correct operation under all conditions; road test or cycle multiple times to ensure fault does not return
Likely causes
- Failed or worn lumbar up switch
- Loss of reference voltage or ground to switch
- Damaged harness (pinched, chafed) between switch and seat module
- Connector corrosion or bent pins at the seat switch or module
- Seat control module output driver fault
Fault status
Status
Seat lumbar up switch circuit malfunction detected. Circuit/switch may be open, shorted, or intermittent.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
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6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
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AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
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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
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