Code
B1030
LAND ROVER
B — Body
Left front seat heater
Views:
UK: 8
EN: 14
RU: 14
AI status
Completed
Completed
100%
Causes
- Open or short in heater element circuit
- Faulty left front seat heating element (burnt or broken filament)
- Poor or corroded connector / pin or damaged wiring harness
- Faulty seat heater switch, control module or relay
- Blown fuse or supply voltage issue
- Intermittent contact due to seat movement or connector under seat
Symptoms
- Left front seat heating does not activate or heats intermittently
- One heating level may work while others fail
- Warning lamp or message for seat heater on dash or infotainment
- DTC present in immobilizer/airbag/seat module scan
- Possible error stored with related CAN message faults
What to check
- Read and record all stored DTCs with a compatible scan tool (body / seat modules)
- Visual inspection of left front seat connectors, wiring harness under seat and seat rail areas
- Check fuses and relays for the seat heater circuit
- Activate seat heater and check for voltage at seat heater connector (with care)
- Measure heater element resistance and continuity
- Check for related module updates or software service bulletins
Signal parameters
- Supply voltage to seat heater switch/module: ~12 V (battery voltage) when activated
- Ground continuity between seat harness and vehicle chassis
- Heater element cold resistance: typically low-ohm range (usually under 10 Ω depending on vehicle/seat design)
- Control module command/status messages on CAN (seat heater on/off, level selection)
- Current draw when heater activated: typically a few amps per element (varies by design)
Diagnostic algorithm
- Safety: Park vehicle, key off, follow manufacturer procedure for disabling airbags/occupant detection if required before working on seat wiring. Disconnect negative battery if advised by service manual.
- Scan: Read stored and pending codes from relevant modules (body/seat/airbag). Note freeze frame and related codes.
- Visual: Inspect left front seat connectors, wiring harness, seat heater element connector, connector seals and pins for corrosion, damage or loose pins. Check fuse(s) for the seat heater circuit.
- Functional: With a second person, attempt to activate seat heater while monitoring for change. Observe dash/information messages and listen for relays.
- Voltage/ground: Back-probe the seat heater connector while activated. Verify presence of battery voltage on supply pin and good ground on return pin. If no supply, trace back to fuse/relay/switch/module.
- Resistance check: With power removed, measure resistance across heater element terminals. Compare to expected low-ohm range; open/infinite = broken element, very high or short to ground = failure.
- Current check: If safe and per manufacturer guidance, measure current draw when heater is energized to confirm proper load (use clamp meter or inline ammeter).
- Wiggle test: With heater powered, carefully move seat tracks and harness to reproduce intermittent faults caused by chafing or loose connections.
- Module/communication: Verify seat control module is communicating on the network and that the switch inputs are seen by module. Check for software/service bulletins and perform module resets or updates if recommended.
- Repair: Repair or replace damaged wiring/connectors; replace heater element or seat cushion assembly if element is open or shorted; replace faulty switch or seat control module if required.
- Verify: Clear codes, re-scan, re-check operation through all heater settings and road test if needed. Confirm no reappearance of B1030 and related symptoms.
Likely causes
- Damaged heater element or internal open
- Connector corrosion or loose terminal at the seat harness
- Wiring chafed/piped through seat rails causing open/short
- Faulty seat heater control switch/module
- Blown fuse or loss of supply/ground
Fault status
Status
Left front seat heater circuit fault — the seat heater control has detected an open, short, or abnormal condition on the left front seat heating circuit. Inspection of element, wiring, connectors and control module recommended.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 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
B1030
MITSUBISHI
B — Body
Pressure sensor performance
Views:
UK: 7
EN: 16
RU: 13
AI status
Completed
Completed
100%
Causes
- Open or short in heater element circuit
- Faulty left front seat heating element (burnt or broken filament)
- Poor or corroded connector / pin or damaged wiring harness
- Faulty seat heater switch, control module or relay
- Blown fuse or supply voltage issue
- Intermittent contact due to seat movement or connector under seat
Symptoms
- Left front seat heating does not activate or heats intermittently
- One heating level may work while others fail
- Warning lamp or message for seat heater on dash or infotainment
- DTC present in immobilizer/airbag/seat module scan
- Possible error stored with related CAN message faults
What to check
- Read and record all stored DTCs with a compatible scan tool (body / seat modules)
- Visual inspection of left front seat connectors, wiring harness under seat and seat rail areas
- Check fuses and relays for the seat heater circuit
- Activate seat heater and check for voltage at seat heater connector (with care)
- Measure heater element resistance and continuity
- Check for related module updates or software service bulletins
Signal parameters
- Supply voltage to seat heater switch/module: ~12 V (battery voltage) when activated
- Ground continuity between seat harness and vehicle chassis
- Heater element cold resistance: typically low-ohm range (usually under 10 Ω depending on vehicle/seat design)
- Control module command/status messages on CAN (seat heater on/off, level selection)
- Current draw when heater activated: typically a few amps per element (varies by design)
Diagnostic algorithm
- Safety: Park vehicle, key off, follow manufacturer procedure for disabling airbags/occupant detection if required before working on seat wiring. Disconnect negative battery if advised by service manual.
- Scan: Read stored and pending codes from relevant modules (body/seat/airbag). Note freeze frame and related codes.
- Visual: Inspect left front seat connectors, wiring harness, seat heater element connector, connector seals and pins for corrosion, damage or loose pins. Check fuse(s) for the seat heater circuit.
- Functional: With a second person, attempt to activate seat heater while monitoring for change. Observe dash/information messages and listen for relays.
- Voltage/ground: Back-probe the seat heater connector while activated. Verify presence of battery voltage on supply pin and good ground on return pin. If no supply, trace back to fuse/relay/switch/module.
- Resistance check: With power removed, measure resistance across heater element terminals. Compare to expected low-ohm range; open/infinite = broken element, very high or short to ground = failure.
- Current check: If safe and per manufacturer guidance, measure current draw when heater is energized to confirm proper load (use clamp meter or inline ammeter).
- Wiggle test: With heater powered, carefully move seat tracks and harness to reproduce intermittent faults caused by chafing or loose connections.
- Module/communication: Verify seat control module is communicating on the network and that the switch inputs are seen by module. Check for software/service bulletins and perform module resets or updates if recommended.
- Repair: Repair or replace damaged wiring/connectors; replace heater element or seat cushion assembly if element is open or shorted; replace faulty switch or seat control module if required.
- Verify: Clear codes, re-scan, re-check operation through all heater settings and road test if needed. Confirm no reappearance of B1030 and related symptoms.
Likely causes
- Damaged heater element or internal open
- Connector corrosion or loose terminal at the seat harness
- Wiring chafed/piped through seat rails causing open/short
- Faulty seat heater control switch/module
- Blown fuse or loss of supply/ground
Fault status
Status
Left front seat heater circuit fault — the seat heater control has detected an open, short, or abnormal condition on the left front seat heating circuit. Inspection of element, wiring, connectors and control module recommended.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
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