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B2112 — Lumbar Up Switch Failed

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Code

B2112

HUMMER B — Body

Lumbar Up Switch Failed

Brand: HUMMER
Type: B — Body
Views: UK: 13 EN: 25 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Record freeze frame data and note any additional codes; clear codes and attempt to re-create the failure
  2. Perform a visual inspection of switch, harness, and connectors. Repair any obvious damage before further testing
  3. Verify fuses and that the seat module has proper battery voltage and ground with ignition in required position
  4. Backprobe the switch connector: verify reference voltage and ground are present, then actuate switch and observe output signal change (voltage or continuity)
  5. If no signal change, check continuity between switch output pin and seat module input pin; repair wiring or connector faults as needed
  6. 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
  7. If wiring and module checks are good, remove and bench-test or replace the lumbar up switch (or entire switch assembly) and retest
  8. 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

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Code

B2112

LAND ROVER B — Body

Failure in the door actuator switch

Brand: LAND ROVER
Type: B — Body
Views: UK: 8 EN: 18 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Record freeze frame data and note any additional codes; clear codes and attempt to re-create the failure
  2. Perform a visual inspection of switch, harness, and connectors. Repair any obvious damage before further testing
  3. Verify fuses and that the seat module has proper battery voltage and ground with ignition in required position
  4. Backprobe the switch connector: verify reference voltage and ground are present, then actuate switch and observe output signal change (voltage or continuity)
  5. If no signal change, check continuity between switch output pin and seat module input pin; repair wiring or connector faults as needed
  6. 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
  7. If wiring and module checks are good, remove and bench-test or replace the lumbar up switch (or entire switch assembly) and retest
  8. 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

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Code

B2112

Other B — Body

Door Driver Set Switch Stuck Failure

Brand: Other
Type: B — Body
Views: UK: 23 EN: 45 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Record freeze frame data and note any additional codes; clear codes and attempt to re-create the failure
  2. Perform a visual inspection of switch, harness, and connectors. Repair any obvious damage before further testing
  3. Verify fuses and that the seat module has proper battery voltage and ground with ignition in required position
  4. Backprobe the switch connector: verify reference voltage and ground are present, then actuate switch and observe output signal change (voltage or continuity)
  5. If no signal change, check continuity between switch output pin and seat module input pin; repair wiring or connector faults as needed
  6. 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
  7. If wiring and module checks are good, remove and bench-test or replace the lumbar up switch (or entire switch assembly) and retest
  8. 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

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Your experience will help others
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Send to email