Code
B1426
LAND ROVER
B — Body
Right front - climate seat - electric thermal device 1
Views:
UK: 6
EN: 19
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the right-front seat heater circuit
- Damaged/heated seat element (broken filament or excessive resistance)
- Poor/corroded connector or pin contact at the seat harness
- Faulty seat heater control module or seat ECU
- Blown fuse or damaged relay supplying the seat heater
- Water ingress or physical damage to the seat pad
Symptoms
- Right front seat heater does not operate or only works intermittently
- Seat heater indicator may not illuminate for the right front seat
- One or more seat heating stages (low/medium/high) unavailable
- DTC B1426 stored and may trigger a warning message or limited functionality
- Possible burning or electrical smell in severe wiring/short cases
What to check
- Read and record stored DTCs and freeze-frame data with a compatible scan tool
- Check for other related seat or body control module codes
- Visual inspection of right front seat, connectors, and wiring for damage or water
- Inspect fuse(s) and relay(s) for the seat heater circuit
- Check connector pins for corrosion, bent pins or poor mating
- Perform wiggle test on harness while monitoring system operation or live data
Signal parameters
- Supply voltage to seat heater: approx. battery voltage (11–14 V) with ignition/accessory on
- Heater element resistance: low-ohm value (varies by vehicle; commonly less than 10–20 Ω)
- Control module output: switched or PWM feed to heater when selected ON
- Circuit continuity between seat heater element terminals and seat ECU ground
- Current draw when heater is commanded ON increases (amps dependent on stage)
Diagnostic algorithm
- Retrieve codes and freeze frame using diagnostic tool; note any other related codes.
- Confirm customer complaint and attempt to operate right front seat heater while monitoring live data.
- Visually inspect the right front seat covering, seams and underside for signs of water, damage or foreign objects.
- Check fuses and relays for the seat heating circuit; replace if faulty and re-test.
- With ignition off, disconnect the seat connector; inspect pins for corrosion, bending or damage. Repair or clean as required.
- Measure resistance of the seat heater element across its terminals (bench or in-situ). Compare to manufacturer spec; an open or very high resistance indicates a broken element.
- With ignition on, measure supply voltage and ground at the seat heater connector while commanding heater ON; verify the control module is delivering voltage (or PWM) to the element.
- If voltage is present but element shows open/high resistance, replace the seat heating element/pad (or seat cushion) or repair wiring as required.
- If element resistance is correct but no control voltage is present, diagnose the seat control module output, related fuses/relays, and vehicle network messages to the module; repair or replace module as needed.
- After repair, clear codes and perform system check to confirm correct operation under all heater stages and verify no recurrence of DTC.
Likely causes
- Broken or high-resistance heating element in the right front seat
- Loose/corroded connector or pin at the seat heater harness
- Open circuit (broken wire) between seat connector and module
- Faulty seat control module output driving the heater
- Moisture inside the seat causing short/ground faults
Fault status
Status
Right front seat heater circuit fault detected — check seat heater element, connectors, wiring, fuses/relays and seat control module. Repair and verify operation.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
B1426
MITSUBISHI
B — Body
FR side analog G sensor fail
Views:
UK: 5
EN: 23
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the right-front seat heater circuit
- Damaged/heated seat element (broken filament or excessive resistance)
- Poor/corroded connector or pin contact at the seat harness
- Faulty seat heater control module or seat ECU
- Blown fuse or damaged relay supplying the seat heater
- Water ingress or physical damage to the seat pad
Symptoms
- Right front seat heater does not operate or only works intermittently
- Seat heater indicator may not illuminate for the right front seat
- One or more seat heating stages (low/medium/high) unavailable
- DTC B1426 stored and may trigger a warning message or limited functionality
- Possible burning or electrical smell in severe wiring/short cases
What to check
- Read and record stored DTCs and freeze-frame data with a compatible scan tool
- Check for other related seat or body control module codes
- Visual inspection of right front seat, connectors, and wiring for damage or water
- Inspect fuse(s) and relay(s) for the seat heater circuit
- Check connector pins for corrosion, bent pins or poor mating
- Perform wiggle test on harness while monitoring system operation or live data
Signal parameters
- Supply voltage to seat heater: approx. battery voltage (11–14 V) with ignition/accessory on
- Heater element resistance: low-ohm value (varies by vehicle; commonly less than 10–20 Ω)
- Control module output: switched or PWM feed to heater when selected ON
- Circuit continuity between seat heater element terminals and seat ECU ground
- Current draw when heater is commanded ON increases (amps dependent on stage)
Diagnostic algorithm
- Retrieve codes and freeze frame using diagnostic tool; note any other related codes.
- Confirm customer complaint and attempt to operate right front seat heater while monitoring live data.
- Visually inspect the right front seat covering, seams and underside for signs of water, damage or foreign objects.
- Check fuses and relays for the seat heating circuit; replace if faulty and re-test.
- With ignition off, disconnect the seat connector; inspect pins for corrosion, bending or damage. Repair or clean as required.
- Measure resistance of the seat heater element across its terminals (bench or in-situ). Compare to manufacturer spec; an open or very high resistance indicates a broken element.
- With ignition on, measure supply voltage and ground at the seat heater connector while commanding heater ON; verify the control module is delivering voltage (or PWM) to the element.
- If voltage is present but element shows open/high resistance, replace the seat heating element/pad (or seat cushion) or repair wiring as required.
- If element resistance is correct but no control voltage is present, diagnose the seat control module output, related fuses/relays, and vehicle network messages to the module; repair or replace module as needed.
- After repair, clear codes and perform system check to confirm correct operation under all heater stages and verify no recurrence of DTC.
Likely causes
- Broken or high-resistance heating element in the right front seat
- Loose/corroded connector or pin at the seat heater harness
- Open circuit (broken wire) between seat connector and module
- Faulty seat control module output driving the heater
- Moisture inside the seat causing short/ground faults
Fault status
Status
Right front seat heater circuit fault detected — check seat heater element, connectors, wiring, fuses/relays and seat control module. Repair and verify operation.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
B1426
Other
B — Body
Lamp Seat Belt Circuit Short To Battery
Views:
UK: 13
EN: 30
RU: 16
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the right-front seat heater circuit
- Damaged/heated seat element (broken filament or excessive resistance)
- Poor/corroded connector or pin contact at the seat harness
- Faulty seat heater control module or seat ECU
- Blown fuse or damaged relay supplying the seat heater
- Water ingress or physical damage to the seat pad
Symptoms
- Right front seat heater does not operate or only works intermittently
- Seat heater indicator may not illuminate for the right front seat
- One or more seat heating stages (low/medium/high) unavailable
- DTC B1426 stored and may trigger a warning message or limited functionality
- Possible burning or electrical smell in severe wiring/short cases
What to check
- Read and record stored DTCs and freeze-frame data with a compatible scan tool
- Check for other related seat or body control module codes
- Visual inspection of right front seat, connectors, and wiring for damage or water
- Inspect fuse(s) and relay(s) for the seat heater circuit
- Check connector pins for corrosion, bent pins or poor mating
- Perform wiggle test on harness while monitoring system operation or live data
Signal parameters
- Supply voltage to seat heater: approx. battery voltage (11–14 V) with ignition/accessory on
- Heater element resistance: low-ohm value (varies by vehicle; commonly less than 10–20 Ω)
- Control module output: switched or PWM feed to heater when selected ON
- Circuit continuity between seat heater element terminals and seat ECU ground
- Current draw when heater is commanded ON increases (amps dependent on stage)
Diagnostic algorithm
- Retrieve codes and freeze frame using diagnostic tool; note any other related codes.
- Confirm customer complaint and attempt to operate right front seat heater while monitoring live data.
- Visually inspect the right front seat covering, seams and underside for signs of water, damage or foreign objects.
- Check fuses and relays for the seat heating circuit; replace if faulty and re-test.
- With ignition off, disconnect the seat connector; inspect pins for corrosion, bending or damage. Repair or clean as required.
- Measure resistance of the seat heater element across its terminals (bench or in-situ). Compare to manufacturer spec; an open or very high resistance indicates a broken element.
- With ignition on, measure supply voltage and ground at the seat heater connector while commanding heater ON; verify the control module is delivering voltage (or PWM) to the element.
- If voltage is present but element shows open/high resistance, replace the seat heating element/pad (or seat cushion) or repair wiring as required.
- If element resistance is correct but no control voltage is present, diagnose the seat control module output, related fuses/relays, and vehicle network messages to the module; repair or replace module as needed.
- After repair, clear codes and perform system check to confirm correct operation under all heater stages and verify no recurrence of DTC.
Likely causes
- Broken or high-resistance heating element in the right front seat
- Loose/corroded connector or pin at the seat heater harness
- Open circuit (broken wire) between seat connector and module
- Faulty seat control module output driving the heater
- Moisture inside the seat causing short/ground faults
Fault status
Status
Right front seat heater circuit fault detected — check seat heater element, connectors, wiring, fuses/relays and seat control module. Repair and verify operation.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email