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Home / DTC / B1705 — Seat switch, backrest of car parked

B1705 — Seat switch, backrest of car parked

Detailed page for trouble code B1705.

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22,491specific
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Code

B1705

LAND ROVER B — Body

Seat switch, backrest of car parked

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

Causes

  • Failed or intermittent backrest switch (mechanical or internal electrical failure)
  • Damaged, corroded or disconnected wiring/connector at the switch or seat control module
  • Poor ground or supply voltage to switch/circuit
  • Seat control module/software fault or internal failure
  • Mechanical binding or obstruction preventing the switch from changing state

Symptoms

  • Backrest position not recognized by vehicle systems
  • Seat memory or power adjustment for backrest not working
  • Warning or message related to seat or seatbelt on dash or in message center
  • Intermittent or complete loss of backrest folding operation (if equipped)

What to check

  • Use a diagnostic scanner to read B1705 and any related DTCs; record freeze frame and live data while cycling the backrest
  • Visually inspect connectors and wiring at the backrest switch and seat control module for corrosion, damage, or loose pins
  • Check fuses and relays for the seat control circuit
  • Operate the backrest while watching live data or the switch state to see if the input changes when the backrest moves
  • Measure supply voltage and ground at the switch connector with a multimeter
  • Check for diagnostic trouble codes on related networks (CAN/ LIN) if seat module communicates digitally

Signal parameters

  • Switch type: typically a digital/open‑closed position switch or a position sensor output — expected to change state when backrest is moved
  • Expected behaviour: signal should toggle between two states when backrest passes the switch actuator (open = high impedance, closed = continuity to ground or to supply depending on design)
  • Electrical checks: continuity (closed ≈ near 0 Ω), open circuit when released; supply reference voltage usually from vehicle battery or module reference — should be present at switch connector when key/seat power enabled
  • If controlled via network: corresponding seat/backrest CAN messages should be present and change when seat is moved

Diagnostic algorithm

  1. Retrieve and record B1705 and any additional seat-related codes with a manufacturer-level scan tool; note freeze frame data.
  2. Verify customer symptom by cycling the backrest and observing live data or switch state in the scanner. Confirm the fault is repeatable.
  3. Visually inspect the backrest switch, seat trim, and wiring harness for damage, pin corrosion, water ingress or loose connectors. Repair obvious issues.
  4. With ignition/seat power on, measure supply voltage and ground at the switch connector. If no supply/ground, trace wiring back to fuse/relay or module.
  5. Measure continuity across the switch while manually actuating it (bench test or in‑vehicle) to confirm it opens/closes reliably.
  6. Backprobe the switch connector while moving the backrest to confirm the signal toggles as expected. If signal doesn’t change, replace or repair the switch assembly/wiring.
  7. If switch and wiring test good, inspect/replace seat control module or update module software/calibration per manufacturer guidance.
  8. After repair, clear codes, re-test the backrest operation multiple times and confirm no reoccurrence of the DTC.

Likely causes

  • Faulty backrest switch
  • Loose/corroded connector or broken wire at the seat harness
  • Incorrect/low supply or poor ground to the switch

Fault status

⚠️ Status
Seat backrest switch/circuit fault detected — backrest position input invalid or missing (detected while parked).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1700 B1701 B1704 B1706 B1710
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

B1705

MITSUBISHI B — Body

Auto light sensor short

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

Causes

  • Failed or intermittent backrest switch (mechanical or internal electrical failure)
  • Damaged, corroded or disconnected wiring/connector at the switch or seat control module
  • Poor ground or supply voltage to switch/circuit
  • Seat control module/software fault or internal failure
  • Mechanical binding or obstruction preventing the switch from changing state

Symptoms

  • Backrest position not recognized by vehicle systems
  • Seat memory or power adjustment for backrest not working
  • Warning or message related to seat or seatbelt on dash or in message center
  • Intermittent or complete loss of backrest folding operation (if equipped)

What to check

  • Use a diagnostic scanner to read B1705 and any related DTCs; record freeze frame and live data while cycling the backrest
  • Visually inspect connectors and wiring at the backrest switch and seat control module for corrosion, damage, or loose pins
  • Check fuses and relays for the seat control circuit
  • Operate the backrest while watching live data or the switch state to see if the input changes when the backrest moves
  • Measure supply voltage and ground at the switch connector with a multimeter
  • Check for diagnostic trouble codes on related networks (CAN/ LIN) if seat module communicates digitally

Signal parameters

  • Switch type: typically a digital/open‑closed position switch or a position sensor output — expected to change state when backrest is moved
  • Expected behaviour: signal should toggle between two states when backrest passes the switch actuator (open = high impedance, closed = continuity to ground or to supply depending on design)
  • Electrical checks: continuity (closed ≈ near 0 Ω), open circuit when released; supply reference voltage usually from vehicle battery or module reference — should be present at switch connector when key/seat power enabled
  • If controlled via network: corresponding seat/backrest CAN messages should be present and change when seat is moved

Diagnostic algorithm

  1. Retrieve and record B1705 and any additional seat-related codes with a manufacturer-level scan tool; note freeze frame data.
  2. Verify customer symptom by cycling the backrest and observing live data or switch state in the scanner. Confirm the fault is repeatable.
  3. Visually inspect the backrest switch, seat trim, and wiring harness for damage, pin corrosion, water ingress or loose connectors. Repair obvious issues.
  4. With ignition/seat power on, measure supply voltage and ground at the switch connector. If no supply/ground, trace wiring back to fuse/relay or module.
  5. Measure continuity across the switch while manually actuating it (bench test or in‑vehicle) to confirm it opens/closes reliably.
  6. Backprobe the switch connector while moving the backrest to confirm the signal toggles as expected. If signal doesn’t change, replace or repair the switch assembly/wiring.
  7. If switch and wiring test good, inspect/replace seat control module or update module software/calibration per manufacturer guidance.
  8. After repair, clear codes, re-test the backrest operation multiple times and confirm no reoccurrence of the DTC.

Likely causes

  • Faulty backrest switch
  • Loose/corroded connector or broken wire at the seat harness
  • Incorrect/low supply or poor ground to the switch

Fault status

⚠️ Status
Seat backrest switch/circuit fault detected — backrest position input invalid or missing (detected while parked).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1700 B1701 B1704 B1706 B1710
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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Code

B1705

Other B — Body

Seat Driver Recline Rearward Switch Circuit Failure

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

Causes

  • Failed or intermittent backrest switch (mechanical or internal electrical failure)
  • Damaged, corroded or disconnected wiring/connector at the switch or seat control module
  • Poor ground or supply voltage to switch/circuit
  • Seat control module/software fault or internal failure
  • Mechanical binding or obstruction preventing the switch from changing state

Symptoms

  • Backrest position not recognized by vehicle systems
  • Seat memory or power adjustment for backrest not working
  • Warning or message related to seat or seatbelt on dash or in message center
  • Intermittent or complete loss of backrest folding operation (if equipped)

What to check

  • Use a diagnostic scanner to read B1705 and any related DTCs; record freeze frame and live data while cycling the backrest
  • Visually inspect connectors and wiring at the backrest switch and seat control module for corrosion, damage, or loose pins
  • Check fuses and relays for the seat control circuit
  • Operate the backrest while watching live data or the switch state to see if the input changes when the backrest moves
  • Measure supply voltage and ground at the switch connector with a multimeter
  • Check for diagnostic trouble codes on related networks (CAN/ LIN) if seat module communicates digitally

Signal parameters

  • Switch type: typically a digital/open‑closed position switch or a position sensor output — expected to change state when backrest is moved
  • Expected behaviour: signal should toggle between two states when backrest passes the switch actuator (open = high impedance, closed = continuity to ground or to supply depending on design)
  • Electrical checks: continuity (closed ≈ near 0 Ω), open circuit when released; supply reference voltage usually from vehicle battery or module reference — should be present at switch connector when key/seat power enabled
  • If controlled via network: corresponding seat/backrest CAN messages should be present and change when seat is moved

Diagnostic algorithm

  1. Retrieve and record B1705 and any additional seat-related codes with a manufacturer-level scan tool; note freeze frame data.
  2. Verify customer symptom by cycling the backrest and observing live data or switch state in the scanner. Confirm the fault is repeatable.
  3. Visually inspect the backrest switch, seat trim, and wiring harness for damage, pin corrosion, water ingress or loose connectors. Repair obvious issues.
  4. With ignition/seat power on, measure supply voltage and ground at the switch connector. If no supply/ground, trace wiring back to fuse/relay or module.
  5. Measure continuity across the switch while manually actuating it (bench test or in‑vehicle) to confirm it opens/closes reliably.
  6. Backprobe the switch connector while moving the backrest to confirm the signal toggles as expected. If signal doesn’t change, replace or repair the switch assembly/wiring.
  7. If switch and wiring test good, inspect/replace seat control module or update module software/calibration per manufacturer guidance.
  8. After repair, clear codes, re-test the backrest operation multiple times and confirm no reoccurrence of the DTC.

Likely causes

  • Faulty backrest switch
  • Loose/corroded connector or broken wire at the seat harness
  • Incorrect/low supply or poor ground to the switch

Fault status

⚠️ Status
Seat backrest switch/circuit fault detected — backrest position input invalid or missing (detected while parked).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1700 B1701 B1704 B1706 B1710
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