Code
B1750
HUMMER
B — Body
Driver Seat Rear Down Switch Circuit Malfunction
Views:
UK: 7
EN: 16
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or short in the switch wiring harness (pinched in seat track)
- Corroded, loose or damaged connector at the switch or seat module
- Failed driver seat rear-down switch
- Failed seat control module / body control module
- Blown fuse or intermittently poor ground
- Mechanical binding preventing switch from operating correctly
Symptoms
- Driver rear portion of the seat cushion will not move down or respond
- Intermittent or no operation of the rear-down seat function
- DTC B1750 stored in diagnostic trouble code memory
- Other seat movement functions may still operate
- Clicking relays or fused operation when attempting movement
What to check
- Read and record freeze-frame and related codes using a scan tool; check live data for seat switch status
- Visually inspect connectors and wiring at the driver seat switch and seat module for damage, corrosion, or loose pins
- Verify fuses related to seat/seat module are intact
- Operate the seat while observing switch and wiring for movement-related damage (perform a wiggle test)
- Backprobe the switch connector and measure reference voltage, signal, and ground with the seat command applied
- Measure continuity and resistance of the switch when actuated; check for short to ground or battery
Signal parameters
- Reference voltage (if used): typically ~5 V reference from seat module (consult service manual)
- Switch closed: signal ~0 V (to ground) or continuity across switch contacts
- Switch open: signal ~reference voltage (≈5 V) or open circuit (infinite ohms)
- Expected closed switch resistance: near 0–5 Ω; open circuit: OL/infinite
- If a variable position sensor is used: signal varies smoothly within 0–5 V across travel — no abrupt jumps
Diagnostic algorithm
- Connect an appropriate scan tool and confirm B1750 and any related codes; note freeze frame data
- Attempt seat rear-down operation while watching live data for the rear-down switch status
- Visually inspect switch connector and harness for obvious damage; repair any rubbed-through insulation or broken wires
- Check related fuses and ground points; clean and secure grounds
- Backprobe the switch connector: verify reference voltage present, verify ground continuity, and verify switch signal changes when actuated. Compare to service manual values
- Perform continuity check on switch wiring between connector and seat module; repair any open/shorts found (pay attention to wiring through the seat track)
- If wiring and power/ground are good, bench-test or replace the switch and retest operation
- If new switch and wiring are good but code returns, test/scan the seat control module and consider module replacement or programming per service information
- Clear codes and verify successful operation and that the DTC does not return after repairs
Likely causes
- Wiring chafed where it passes through the seat base/track
- Connector pins corroded or pushed out at the switch or module
- Switch contacts worn or contaminated
- Seat module input circuit fault
Fault status
Status
Driver Seat Rear Down Switch Circuit: electrical signal out of expected range (open/short or invalid signal) detected by seat control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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HUMMER 2010 Hummer H3 Alpha
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Code
B1750
MITSUBISHI
B — Body
Driver's door status fail
Views:
UK: 6
EN: 12
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or short in the switch wiring harness (pinched in seat track)
- Corroded, loose or damaged connector at the switch or seat module
- Failed driver seat rear-down switch
- Failed seat control module / body control module
- Blown fuse or intermittently poor ground
- Mechanical binding preventing switch from operating correctly
Symptoms
- Driver rear portion of the seat cushion will not move down or respond
- Intermittent or no operation of the rear-down seat function
- DTC B1750 stored in diagnostic trouble code memory
- Other seat movement functions may still operate
- Clicking relays or fused operation when attempting movement
What to check
- Read and record freeze-frame and related codes using a scan tool; check live data for seat switch status
- Visually inspect connectors and wiring at the driver seat switch and seat module for damage, corrosion, or loose pins
- Verify fuses related to seat/seat module are intact
- Operate the seat while observing switch and wiring for movement-related damage (perform a wiggle test)
- Backprobe the switch connector and measure reference voltage, signal, and ground with the seat command applied
- Measure continuity and resistance of the switch when actuated; check for short to ground or battery
Signal parameters
- Reference voltage (if used): typically ~5 V reference from seat module (consult service manual)
- Switch closed: signal ~0 V (to ground) or continuity across switch contacts
- Switch open: signal ~reference voltage (≈5 V) or open circuit (infinite ohms)
- Expected closed switch resistance: near 0–5 Ω; open circuit: OL/infinite
- If a variable position sensor is used: signal varies smoothly within 0–5 V across travel — no abrupt jumps
Diagnostic algorithm
- Connect an appropriate scan tool and confirm B1750 and any related codes; note freeze frame data
- Attempt seat rear-down operation while watching live data for the rear-down switch status
- Visually inspect switch connector and harness for obvious damage; repair any rubbed-through insulation or broken wires
- Check related fuses and ground points; clean and secure grounds
- Backprobe the switch connector: verify reference voltage present, verify ground continuity, and verify switch signal changes when actuated. Compare to service manual values
- Perform continuity check on switch wiring between connector and seat module; repair any open/shorts found (pay attention to wiring through the seat track)
- If wiring and power/ground are good, bench-test or replace the switch and retest operation
- If new switch and wiring are good but code returns, test/scan the seat control module and consider module replacement or programming per service information
- Clear codes and verify successful operation and that the DTC does not return after repairs
Likely causes
- Wiring chafed where it passes through the seat base/track
- Connector pins corroded or pushed out at the switch or module
- Switch contacts worn or contaminated
- Seat module input circuit fault
Fault status
Status
Driver Seat Rear Down Switch Circuit: electrical signal out of expected range (open/short or invalid signal) detected by seat control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
B1750
Other
B — Body
Park/Neutral Switch Circuit Open
Views:
UK: 16
EN: 24
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in the switch wiring harness (pinched in seat track)
- Corroded, loose or damaged connector at the switch or seat module
- Failed driver seat rear-down switch
- Failed seat control module / body control module
- Blown fuse or intermittently poor ground
- Mechanical binding preventing switch from operating correctly
Symptoms
- Driver rear portion of the seat cushion will not move down or respond
- Intermittent or no operation of the rear-down seat function
- DTC B1750 stored in diagnostic trouble code memory
- Other seat movement functions may still operate
- Clicking relays or fused operation when attempting movement
What to check
- Read and record freeze-frame and related codes using a scan tool; check live data for seat switch status
- Visually inspect connectors and wiring at the driver seat switch and seat module for damage, corrosion, or loose pins
- Verify fuses related to seat/seat module are intact
- Operate the seat while observing switch and wiring for movement-related damage (perform a wiggle test)
- Backprobe the switch connector and measure reference voltage, signal, and ground with the seat command applied
- Measure continuity and resistance of the switch when actuated; check for short to ground or battery
Signal parameters
- Reference voltage (if used): typically ~5 V reference from seat module (consult service manual)
- Switch closed: signal ~0 V (to ground) or continuity across switch contacts
- Switch open: signal ~reference voltage (≈5 V) or open circuit (infinite ohms)
- Expected closed switch resistance: near 0–5 Ω; open circuit: OL/infinite
- If a variable position sensor is used: signal varies smoothly within 0–5 V across travel — no abrupt jumps
Diagnostic algorithm
- Connect an appropriate scan tool and confirm B1750 and any related codes; note freeze frame data
- Attempt seat rear-down operation while watching live data for the rear-down switch status
- Visually inspect switch connector and harness for obvious damage; repair any rubbed-through insulation or broken wires
- Check related fuses and ground points; clean and secure grounds
- Backprobe the switch connector: verify reference voltage present, verify ground continuity, and verify switch signal changes when actuated. Compare to service manual values
- Perform continuity check on switch wiring between connector and seat module; repair any open/shorts found (pay attention to wiring through the seat track)
- If wiring and power/ground are good, bench-test or replace the switch and retest operation
- If new switch and wiring are good but code returns, test/scan the seat control module and consider module replacement or programming per service information
- Clear codes and verify successful operation and that the DTC does not return after repairs
Likely causes
- Wiring chafed where it passes through the seat base/track
- Connector pins corroded or pushed out at the switch or module
- Switch contacts worn or contaminated
- Seat module input circuit fault
Fault status
Status
Driver Seat Rear Down Switch Circuit: electrical signal out of expected range (open/short or invalid signal) detected by seat control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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