Code
B1735
HUMMER
B — Body
Driver Seat Front Up Switch Circuit Malfunction (Power Seat Switch Circuit)
AI status
Completed
Completed
100%
Causes
- Broken or chafed wiring in the driver seat switch harness
- Poor or corroded connector at the seat switch or seat module
- Faulty driver seat front up switch (mechanical/electrical failure)
- Faulty seat control module or motor driver
- Short to power or ground in the switch circuit
- Blown fuse or poor power/ground to seat circuit
Symptoms
- Driver seat front tilt will not move up when the switch is pressed
- Seat may not respond or may respond intermittently to the front-up command
- Other seat functions may still work (if separate circuits) or multiple seat functions may fail if a common supply/ground is affected
- DTC B1735 stored in memory and may reappear after clearing
What to check
- Read stored DTCs and freeze-frame data with a capable scan tool
- Visually inspect the driver seat switch assembly and wiring harness for damage, chafing, or water intrusion
- Check connectors at the switch and seat control module for corrosion, bent pins, or loose terminals
- Verify fuses and any related power/ground feeds for the seat circuit
- Operate the switch while monitoring the circuit with a multimeter or test light to see if signal changes
- Wiggle wiring harness (with key on, engine off) to try to reproduce the fault if intermittent
Signal parameters
- Key ON (accessory) — reference power feed to switch: ~12 V (vehicle battery voltage) or a module reference voltage depending on design
- Switch actuation — switch output should change state (either connect to ground or to reference voltage) when pressed; confirm by backprobed voltage change while actuating
- Continuity — closed switch contacts: near 0 Ω; open when released (infinite Ω) for simple mechanical switches
- Seat motor current draw — when motor commanded, expect measurable current (amps) appropriate to seat motor; large deviations may indicate motor or wiring issue
Diagnostic algorithm
- Retrieve B1735 and any related codes with a scan tool. Note freeze-frame and whether fault is current or history.
- Visually inspect switch assembly, seat wiring, connectors and seat module for obvious damage, corrosion or water ingress. Repair visible damage.
- Verify fuse(s) and battery voltage at the seat circuit power feed. Replace blown fuses and retest.
- With key ON, backprobe the switch connector and confirm reference power and ground are present. Actuate the front-up switch and observe whether the signal changes (voltage goes to ground or to reference as designed).
- If no change at switch connector, isolate between switch and seat module: test continuity between the switch output pin and the module input pin. Repair any open/shorts found.
- If switch signals correctly but module does not respond, test at the seat module input pins for the same signal while actuating. If module input sees correct signal but actuator doesn’t run, suspect module or motor driver.
- If switch is suspected, disconnect power and remove switch for bench continuity/resistance testing. Replace switch if contacts fail to operate reliably.
- Check seat motor and mechanical movement for binding; verify motor draws expected current when operated. Replace motor if shorted or drawing excessive current.
- After repairs, clear codes and cycle through seat functions several times. Drive/operate for a period to confirm the code does not return.
- Safety note: many seats have occupancy sensors and SRS connectors—follow manufacturer procedures and isolate the battery as required before removing seat components.
Likely causes
- Open or intermittent wire between the seat switch and seat control module due to harness damage
- Corroded connector at the switch or module pin causing loss of signal
- Failed front-up switch contact (common wear/failure point)
- Internal failure in the seat module that cannot interpret switch inputs
Fault status
Status
Stored fault: Driver Seat Front Up Switch Circuit Malfunction — switch signal open/short/intermittent detected by seat control module.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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Code
B1735
Other
B — Body
Mirror Driver Vertical Switch Circuit Short To Battery
AI status
Completed
Completed
100%
Causes
- Broken or chafed wiring in the driver seat switch harness
- Poor or corroded connector at the seat switch or seat module
- Faulty driver seat front up switch (mechanical/electrical failure)
- Faulty seat control module or motor driver
- Short to power or ground in the switch circuit
- Blown fuse or poor power/ground to seat circuit
Symptoms
- Driver seat front tilt will not move up when the switch is pressed
- Seat may not respond or may respond intermittently to the front-up command
- Other seat functions may still work (if separate circuits) or multiple seat functions may fail if a common supply/ground is affected
- DTC B1735 stored in memory and may reappear after clearing
What to check
- Read stored DTCs and freeze-frame data with a capable scan tool
- Visually inspect the driver seat switch assembly and wiring harness for damage, chafing, or water intrusion
- Check connectors at the switch and seat control module for corrosion, bent pins, or loose terminals
- Verify fuses and any related power/ground feeds for the seat circuit
- Operate the switch while monitoring the circuit with a multimeter or test light to see if signal changes
- Wiggle wiring harness (with key on, engine off) to try to reproduce the fault if intermittent
Signal parameters
- Key ON (accessory) — reference power feed to switch: ~12 V (vehicle battery voltage) or a module reference voltage depending on design
- Switch actuation — switch output should change state (either connect to ground or to reference voltage) when pressed; confirm by backprobed voltage change while actuating
- Continuity — closed switch contacts: near 0 Ω; open when released (infinite Ω) for simple mechanical switches
- Seat motor current draw — when motor commanded, expect measurable current (amps) appropriate to seat motor; large deviations may indicate motor or wiring issue
Diagnostic algorithm
- Retrieve B1735 and any related codes with a scan tool. Note freeze-frame and whether fault is current or history.
- Visually inspect switch assembly, seat wiring, connectors and seat module for obvious damage, corrosion or water ingress. Repair visible damage.
- Verify fuse(s) and battery voltage at the seat circuit power feed. Replace blown fuses and retest.
- With key ON, backprobe the switch connector and confirm reference power and ground are present. Actuate the front-up switch and observe whether the signal changes (voltage goes to ground or to reference as designed).
- If no change at switch connector, isolate between switch and seat module: test continuity between the switch output pin and the module input pin. Repair any open/shorts found.
- If switch signals correctly but module does not respond, test at the seat module input pins for the same signal while actuating. If module input sees correct signal but actuator doesn’t run, suspect module or motor driver.
- If switch is suspected, disconnect power and remove switch for bench continuity/resistance testing. Replace switch if contacts fail to operate reliably.
- Check seat motor and mechanical movement for binding; verify motor draws expected current when operated. Replace motor if shorted or drawing excessive current.
- After repairs, clear codes and cycle through seat functions several times. Drive/operate for a period to confirm the code does not return.
- Safety note: many seats have occupancy sensors and SRS connectors—follow manufacturer procedures and isolate the battery as required before removing seat components.
Likely causes
- Open or intermittent wire between the seat switch and seat control module due to harness damage
- Corroded connector at the switch or module pin causing loss of signal
- Failed front-up switch contact (common wear/failure point)
- Internal failure in the seat module that cannot interpret switch inputs
Fault status
Status
Stored fault: Driver Seat Front Up Switch Circuit Malfunction — switch signal open/short/intermittent detected by seat control module.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Repair manuals
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