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Home / DTC / B2102 — Recline Forward Switch Failed

B2102 — Recline Forward Switch Failed

Detailed page for trouble code B2102.

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59brands
11,914generic
22,491specific
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Code

B2102

HUMMER B — Body

Recline Forward Switch Failed

Brand: HUMMER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or worn recline forward switch
  • Open or shorted wiring in the seat harness
  • Poor or corroded connector terminals
  • Faulty seat control module / body control module (BCM)
  • Blown fuse or loss of ignition/reference power to the switch
  • Water intrusion or contamination at the switch or connector

Symptoms

  • Forward recline function does not operate when switch is pressed
  • Intermittent or inconsistent forward recline operation
  • DTC B2102 stored in the vehicle control module
  • Other seat position functions may be unaffected or may show related faults
  • No audible motor activity when attempting forward recline

What to check

  • Use a scan tool to read freeze frame data and confirm B2102 is current or stored
  • Visually inspect the recline switch, seat wiring, and connectors for damage or corrosion
  • Backprobe switch connector and check for reference voltage and ground
  • Verify continuity of switch circuit while moving seat and hinge areas
  • Check related fuses and power feeds for the seat/BCM circuit
  • Perform a wiggle test on the seat harness and connector while monitoring the switch signal

Signal parameters

  • Reference voltage: commonly 5 V (switch signal) or battery voltage depending on vehicle design
  • Expected switch closed resistance: close to 0 Ω (short to signal/ground path) when actuated
  • Expected switch open resistance: very high / open circuit when released
  • Signal should toggle between open and reference when the forward recline switch is pressed/released
  • No excessive voltage drop on power/ground lines (battery voltage present at feed pin with ignition on)

Diagnostic algorithm

  1. Connect a scan tool, record the code(s) and attempt to reproduce the failure while viewing live data for the recline switch input.
  2. Visually inspect the switch assembly, seat trim, harness at hinge points and connector for damage, burning, or corrosion.
  3. With ignition ON, backprobe the switch connector: verify reference voltage, switch output signal and ground presence. Observe signal while operating the switch.
  4. If no reference power, trace and check related fuses and power supply circuits. Repair any open power feeds.
  5. Check continuity of the switch circuit from the switch connector to the seat control module connector. Move the seat and harness to expose possible intermittent breaks.
  6. If switch wiring and power/ground are good but signal does not change, disconnect the switch and measure resistance across switch terminals while actuating. Replace switch if it does not change as specified.
  7. If switch tests good, backprobe at the seat control module input. If the module does not see the signal, suspect connector pins or the module. Repair or replace as appropriate.
  8. After repairs, clear codes and confirm normal operation over multiple cycles and seat positions. If code returns, pursue module-level diagnostics or manufacturer service information.

Likely causes

  • Switch contacts failed (open when pressed)
  • Broken wire or chafed conductor at seat hinge area
  • Poor pin-to-pin connection at the seat wiring connector
  • Seat module not recognizing a valid switch input due to module fault or software error
  • Intermittent connection caused by moisture or seat movement

Fault status

⚠️ Status
Recline forward switch circuit fault detected. Circuit open/short or switch failure preventing valid forward recline input to seat control module. Inspect switch, wiring, connectors, fuses and seat control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2100 B2101 B2103 B2104 B2110
Repair manuals

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138

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Code

B2102

LAND ROVER B — Body

Antenna circuit - short to ground

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or worn recline forward switch
  • Open or shorted wiring in the seat harness
  • Poor or corroded connector terminals
  • Faulty seat control module / body control module (BCM)
  • Blown fuse or loss of ignition/reference power to the switch
  • Water intrusion or contamination at the switch or connector

Symptoms

  • Forward recline function does not operate when switch is pressed
  • Intermittent or inconsistent forward recline operation
  • DTC B2102 stored in the vehicle control module
  • Other seat position functions may be unaffected or may show related faults
  • No audible motor activity when attempting forward recline

What to check

  • Use a scan tool to read freeze frame data and confirm B2102 is current or stored
  • Visually inspect the recline switch, seat wiring, and connectors for damage or corrosion
  • Backprobe switch connector and check for reference voltage and ground
  • Verify continuity of switch circuit while moving seat and hinge areas
  • Check related fuses and power feeds for the seat/BCM circuit
  • Perform a wiggle test on the seat harness and connector while monitoring the switch signal

Signal parameters

  • Reference voltage: commonly 5 V (switch signal) or battery voltage depending on vehicle design
  • Expected switch closed resistance: close to 0 Ω (short to signal/ground path) when actuated
  • Expected switch open resistance: very high / open circuit when released
  • Signal should toggle between open and reference when the forward recline switch is pressed/released
  • No excessive voltage drop on power/ground lines (battery voltage present at feed pin with ignition on)

Diagnostic algorithm

  1. Connect a scan tool, record the code(s) and attempt to reproduce the failure while viewing live data for the recline switch input.
  2. Visually inspect the switch assembly, seat trim, harness at hinge points and connector for damage, burning, or corrosion.
  3. With ignition ON, backprobe the switch connector: verify reference voltage, switch output signal and ground presence. Observe signal while operating the switch.
  4. If no reference power, trace and check related fuses and power supply circuits. Repair any open power feeds.
  5. Check continuity of the switch circuit from the switch connector to the seat control module connector. Move the seat and harness to expose possible intermittent breaks.
  6. If switch wiring and power/ground are good but signal does not change, disconnect the switch and measure resistance across switch terminals while actuating. Replace switch if it does not change as specified.
  7. If switch tests good, backprobe at the seat control module input. If the module does not see the signal, suspect connector pins or the module. Repair or replace as appropriate.
  8. After repairs, clear codes and confirm normal operation over multiple cycles and seat positions. If code returns, pursue module-level diagnostics or manufacturer service information.

Likely causes

  • Switch contacts failed (open when pressed)
  • Broken wire or chafed conductor at seat hinge area
  • Poor pin-to-pin connection at the seat wiring connector
  • Seat module not recognizing a valid switch input due to module fault or software error
  • Intermittent connection caused by moisture or seat movement

Fault status

⚠️ Status
Recline forward switch circuit fault detected. Circuit open/short or switch failure preventing valid forward recline input to seat control module. Inspect switch, wiring, connectors, fuses and seat control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2100 B2101 B2103 B2104 B2110
320

Browse 320 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

B2102

MITSUBISHI B — Body

IG SW start POS.circuit high

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or worn recline forward switch
  • Open or shorted wiring in the seat harness
  • Poor or corroded connector terminals
  • Faulty seat control module / body control module (BCM)
  • Blown fuse or loss of ignition/reference power to the switch
  • Water intrusion or contamination at the switch or connector

Symptoms

  • Forward recline function does not operate when switch is pressed
  • Intermittent or inconsistent forward recline operation
  • DTC B2102 stored in the vehicle control module
  • Other seat position functions may be unaffected or may show related faults
  • No audible motor activity when attempting forward recline

What to check

  • Use a scan tool to read freeze frame data and confirm B2102 is current or stored
  • Visually inspect the recline switch, seat wiring, and connectors for damage or corrosion
  • Backprobe switch connector and check for reference voltage and ground
  • Verify continuity of switch circuit while moving seat and hinge areas
  • Check related fuses and power feeds for the seat/BCM circuit
  • Perform a wiggle test on the seat harness and connector while monitoring the switch signal

Signal parameters

  • Reference voltage: commonly 5 V (switch signal) or battery voltage depending on vehicle design
  • Expected switch closed resistance: close to 0 Ω (short to signal/ground path) when actuated
  • Expected switch open resistance: very high / open circuit when released
  • Signal should toggle between open and reference when the forward recline switch is pressed/released
  • No excessive voltage drop on power/ground lines (battery voltage present at feed pin with ignition on)

Diagnostic algorithm

  1. Connect a scan tool, record the code(s) and attempt to reproduce the failure while viewing live data for the recline switch input.
  2. Visually inspect the switch assembly, seat trim, harness at hinge points and connector for damage, burning, or corrosion.
  3. With ignition ON, backprobe the switch connector: verify reference voltage, switch output signal and ground presence. Observe signal while operating the switch.
  4. If no reference power, trace and check related fuses and power supply circuits. Repair any open power feeds.
  5. Check continuity of the switch circuit from the switch connector to the seat control module connector. Move the seat and harness to expose possible intermittent breaks.
  6. If switch wiring and power/ground are good but signal does not change, disconnect the switch and measure resistance across switch terminals while actuating. Replace switch if it does not change as specified.
  7. If switch tests good, backprobe at the seat control module input. If the module does not see the signal, suspect connector pins or the module. Repair or replace as appropriate.
  8. After repairs, clear codes and confirm normal operation over multiple cycles and seat positions. If code returns, pursue module-level diagnostics or manufacturer service information.

Likely causes

  • Switch contacts failed (open when pressed)
  • Broken wire or chafed conductor at seat hinge area
  • Poor pin-to-pin connection at the seat wiring connector
  • Seat module not recognizing a valid switch input due to module fault or software error
  • Intermittent connection caused by moisture or seat movement

Fault status

⚠️ Status
Recline forward switch circuit fault detected. Circuit open/short or switch failure preventing valid forward recline input to seat control module. Inspect switch, wiring, connectors, fuses and seat control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2100 B2101 B2103 B2104 B2110
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B2102

Other B — Body

Antenna Circuit Short to Ground

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or worn recline forward switch
  • Open or shorted wiring in the seat harness
  • Poor or corroded connector terminals
  • Faulty seat control module / body control module (BCM)
  • Blown fuse or loss of ignition/reference power to the switch
  • Water intrusion or contamination at the switch or connector

Symptoms

  • Forward recline function does not operate when switch is pressed
  • Intermittent or inconsistent forward recline operation
  • DTC B2102 stored in the vehicle control module
  • Other seat position functions may be unaffected or may show related faults
  • No audible motor activity when attempting forward recline

What to check

  • Use a scan tool to read freeze frame data and confirm B2102 is current or stored
  • Visually inspect the recline switch, seat wiring, and connectors for damage or corrosion
  • Backprobe switch connector and check for reference voltage and ground
  • Verify continuity of switch circuit while moving seat and hinge areas
  • Check related fuses and power feeds for the seat/BCM circuit
  • Perform a wiggle test on the seat harness and connector while monitoring the switch signal

Signal parameters

  • Reference voltage: commonly 5 V (switch signal) or battery voltage depending on vehicle design
  • Expected switch closed resistance: close to 0 Ω (short to signal/ground path) when actuated
  • Expected switch open resistance: very high / open circuit when released
  • Signal should toggle between open and reference when the forward recline switch is pressed/released
  • No excessive voltage drop on power/ground lines (battery voltage present at feed pin with ignition on)

Diagnostic algorithm

  1. Connect a scan tool, record the code(s) and attempt to reproduce the failure while viewing live data for the recline switch input.
  2. Visually inspect the switch assembly, seat trim, harness at hinge points and connector for damage, burning, or corrosion.
  3. With ignition ON, backprobe the switch connector: verify reference voltage, switch output signal and ground presence. Observe signal while operating the switch.
  4. If no reference power, trace and check related fuses and power supply circuits. Repair any open power feeds.
  5. Check continuity of the switch circuit from the switch connector to the seat control module connector. Move the seat and harness to expose possible intermittent breaks.
  6. If switch wiring and power/ground are good but signal does not change, disconnect the switch and measure resistance across switch terminals while actuating. Replace switch if it does not change as specified.
  7. If switch tests good, backprobe at the seat control module input. If the module does not see the signal, suspect connector pins or the module. Repair or replace as appropriate.
  8. After repairs, clear codes and confirm normal operation over multiple cycles and seat positions. If code returns, pursue module-level diagnostics or manufacturer service information.

Likely causes

  • Switch contacts failed (open when pressed)
  • Broken wire or chafed conductor at seat hinge area
  • Poor pin-to-pin connection at the seat wiring connector
  • Seat module not recognizing a valid switch input due to module fault or software error
  • Intermittent connection caused by moisture or seat movement

Fault status

⚠️ Status
Recline forward switch circuit fault detected. Circuit open/short or switch failure preventing valid forward recline input to seat control module. Inspect switch, wiring, connectors, fuses and seat control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2100 B2101 B2103 B2104 B2110
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