Code
B1033
LAND ROVER
B — Body
Right rear seat heater
Views:
UK: 6
EN: 13
RU: 8
AI status
Completed
Completed
100%
Causes
- Open circuit in right rear seat heater element
- Short to ground or short to battery in heater wiring
- Corroded or disconnected connector at seat harness or seat module
- Blown fuse or faulty ignition/seat power feed
- Faulty seat heater switch or control module (seat ECU)
- Water ingress or physical damage to seat cushion/heater pad
Symptoms
- Right rear seat fails to heat or heats intermittently
- Seat heater indicator (on switch) does not illuminate or flashes
- DTC B1033 stored in vehicle network/seat module memory
- Possible other seat-related faults or occupant detection anomalies if water damage present
What to check
- Scan vehicle with an appropriate diagnostic tool; read freeze frame and stored DTCs from seat module and related body/comfort modules
- Visually inspect right rear seat cushion and underside for moisture, damage or signs of repair
- Inspect connectors under the seat and at the seat module for corrosion, bent pins or poor retention
- Check relevant fuses and relays for continuity and correct power feed
- With ignition on and seat heater switch operated, check for 12 V (or battery voltage) at the seat heater power connector (follow service manual pinout)
- Measure resistance of the heater element between its terminals (seat removed if required) and compare to specification; check for open circuit
Signal parameters
- Supply voltage to seat heater when switched on: ~12 V (present only with ignition/accessory on depending on model)
- Heater element DC resistance: typically a low value (often single to low tens of ohms) — open circuit (OL) indicates a broken element
- Thermistor/temperature sensor (if present) resistance varies with temperature (consult service manual; often in kΩ range at ambient)
- Seat module output switching duty cycle or PWM; diagnostic tool should show commanded output when heater is requested
Diagnostic algorithm
- Use a diagnostic scanner to confirm B1033 and check for additional related codes in seat and body modules.
- Perform a visual inspection of the right rear seat area for water ingress, damage, or loose connectors; repair as required.
- With ignition off, disconnect battery per manufacturer procedures if you will remove the seat or access SRS/occupant sensor components (safety precaution).
- Locate the right rear seat heater connector. With heater off, measure resistance across heater terminals. An open circuit or much higher than specification indicates a failed element.
- With ignition on and heater switch commanded ON, measure supply voltage at the heater connector power terminal and verify ground continuity at the return terminal. If no supply, trace back to fuse, relay or ignition feed.
- If supply present but element open, replace seat cushion/heater pad following service manual procedure. If supply absent, repair wiring or replace faulty fuse/relay/switch/module.
- If heater element and wiring good but no command output from seat module, diagnose seat module outputs and CAN communications; replace or reprogram module only after confirming wiring and inputs are correct.
- After repairs, clear DTCs and perform functional test and road/test cycle to confirm heater operation and that DTC does not return.
Likely causes
- Open or broken heater element in right rear seat cushion
- Corroded/loose connector at under‑seat harness or seat module
- Blown fuse or loss of supply to seat heater circuit
- Intermittent wiring short caused by seat frame chafing
- Failed seat module output transistor or switch
Fault status
Status
Right rear seat heater circuit fault detected — open/short/overcurrent or module fault. Fault stored in seat/comfort module memory.
Repair difficulty: Medium
Diagnostic time: 1.0-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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Code
B1033
MITSUBISHI
B — Body
Pressure sensor open
Views:
UK: 7
EN: 15
RU: 7
AI status
Completed
Completed
100%
Causes
- Open circuit in right rear seat heater element
- Short to ground or short to battery in heater wiring
- Corroded or disconnected connector at seat harness or seat module
- Blown fuse or faulty ignition/seat power feed
- Faulty seat heater switch or control module (seat ECU)
- Water ingress or physical damage to seat cushion/heater pad
Symptoms
- Right rear seat fails to heat or heats intermittently
- Seat heater indicator (on switch) does not illuminate or flashes
- DTC B1033 stored in vehicle network/seat module memory
- Possible other seat-related faults or occupant detection anomalies if water damage present
What to check
- Scan vehicle with an appropriate diagnostic tool; read freeze frame and stored DTCs from seat module and related body/comfort modules
- Visually inspect right rear seat cushion and underside for moisture, damage or signs of repair
- Inspect connectors under the seat and at the seat module for corrosion, bent pins or poor retention
- Check relevant fuses and relays for continuity and correct power feed
- With ignition on and seat heater switch operated, check for 12 V (or battery voltage) at the seat heater power connector (follow service manual pinout)
- Measure resistance of the heater element between its terminals (seat removed if required) and compare to specification; check for open circuit
Signal parameters
- Supply voltage to seat heater when switched on: ~12 V (present only with ignition/accessory on depending on model)
- Heater element DC resistance: typically a low value (often single to low tens of ohms) — open circuit (OL) indicates a broken element
- Thermistor/temperature sensor (if present) resistance varies with temperature (consult service manual; often in kΩ range at ambient)
- Seat module output switching duty cycle or PWM; diagnostic tool should show commanded output when heater is requested
Diagnostic algorithm
- Use a diagnostic scanner to confirm B1033 and check for additional related codes in seat and body modules.
- Perform a visual inspection of the right rear seat area for water ingress, damage, or loose connectors; repair as required.
- With ignition off, disconnect battery per manufacturer procedures if you will remove the seat or access SRS/occupant sensor components (safety precaution).
- Locate the right rear seat heater connector. With heater off, measure resistance across heater terminals. An open circuit or much higher than specification indicates a failed element.
- With ignition on and heater switch commanded ON, measure supply voltage at the heater connector power terminal and verify ground continuity at the return terminal. If no supply, trace back to fuse, relay or ignition feed.
- If supply present but element open, replace seat cushion/heater pad following service manual procedure. If supply absent, repair wiring or replace faulty fuse/relay/switch/module.
- If heater element and wiring good but no command output from seat module, diagnose seat module outputs and CAN communications; replace or reprogram module only after confirming wiring and inputs are correct.
- After repairs, clear DTCs and perform functional test and road/test cycle to confirm heater operation and that DTC does not return.
Likely causes
- Open or broken heater element in right rear seat cushion
- Corroded/loose connector at under‑seat harness or seat module
- Blown fuse or loss of supply to seat heater circuit
- Intermittent wiring short caused by seat frame chafing
- Failed seat module output transistor or switch
Fault status
Status
Right rear seat heater circuit fault detected — open/short/overcurrent or module fault. Fault stored in seat/comfort module memory.
Repair difficulty: Medium
Diagnostic time: 1.0-2.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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👍 Like
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👎 Dislike
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Send to email