Seat Heater Symptoms Seat Heater Mat DTC

WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

SEAT HEATER SYMPTOMS	SEAT HEATER MAT DTC PRESENT/DETAILS?	POSSIBLE CAUSES	ACTION
Seat cushion and backrest heater mats not generating heat although heating is switched on	NOTE: DTC s that could be set - B1034-01/B1035-01/B1036-01/B1037-01/B1038-01/B1039-01/B103A-01/B103B-01 Yes/DTC text mentions "Heater Element - General electrical failure"	ECO mode preventing seats from reaching maximum temperature Over-current (short circuit/low resistance) on seat heater output detected Short circuit to ground in wiring harness Open circuit in wiring harness Short circuit to ground/low resistance in seat cushion heater mat Open circuit in seat cushion heater mat Short circuit to ground/low resistance in backrest heater mat Open circuit in backrest heater mat Backrest heater mat disconnected	NOTE: Only replace the defective unit, DO NOT replace in sets. Make sure to record the DTC in the verbatim If both seats are at fault, using the Jaguar Land Rover approved diagnostic equipment, make sure the HVAC Control Module (HVAC) is updated to the latest level software and retest the system Check wiring harness for circuit faults including bent/backed out pins and rectify as required Check backrest heater mat is securely connected If no circuit faults are present and if backrest heater connection are secure, then replace either the seat cushion or the backrest heater mats as required (see guidance notes below for advice on pinpointing which heater mat is faulty)
Seat cushion and backrest heater mats not generating heat although heating is switched on	NOTE: DTC s that could be set - B1038-01/B1039-01/B103A-01/B103B-01/B1030-87/B1031-87/B1032-87/B1033-87/B1DFB-87/B1DFC-87/B1DFD-87/B1DFE-87 Yes/DTC text mentions "Missing Message" or "Heater Sensor"	LIN communication error Wiring harness issue HVAC Control Module LIN bus failure or failure of another component on the LIN bus Internal seat heater module temperature too high Seat cushion temperature sensor open circuit Temperature sensor internal failure Seat heater module self-test failure Seat heater module internal failure	NOTE: Only replace the defective unit, DO NOT replace in sets. Make sure to record the DTC in the verbatim Check wiring harness for circuit faults including bent/backed out pins and rectify as required Check for LIN bus faults (master and slave modules) and rectify as required If fault persists, replace the seat cushion heater mat
Seat cushion and backrest heater mats not generating heat although heating is switched on	Yes	Over-voltage on seat heater module power circuit Battery voltage too high (above 16 volts)	Refer to the repair information and battery care information and check the vehicle charging circuit performance
	Yes	Under-voltage on seat heater module power circuit Battery voltage too low (below 8 volts)
Seat cushion and backrest heater mats are heating at full power when first switched on, but power is automatically reduced after 40 minutes Heating controls (switches/touchscreen) show seat heating is active	NOTE: DTC s that could be set - B1030-87/B1031-87/B1032-87/B1033-87/B1034-01/B1035-01/B1036-01/B1037-01/B1038-01/B14E0-87/B14E1-87/B151D-01/B151E-01 Yes	Seat cushion temperature failsafe timer expired Temperature sensor not correctly positioned within heater mat High resistance in seat cushion or backrest heater mats due to damaged heating elements	NOTE: Only replace the defective unit, DO NOT replace in sets. Make sure to record the DTC in the verbatim Using the Jaguar Land Rover approved diagnostic equipment, make sure the HVAC is updated with the latest level software and retest the system before replacing any parts Replace either the seat cushion or the backrest heater mats as required (see guidance notes below for advice on pinpointing which heater mat is faulty)
Only backrest heater mat is generating heat continuously although heating is switched off	NOTE: DTC s that could be set - B1030-87/B1031-87/B1032-87/B1033-87/B14E0-87/B14E1-87 Yes	Seat heater module heater output short circuited to power Short circuit of backrest heater mat to power circuit in wire harness	NOTE: Only replace the defective unit, DO NOT replace in sets. Make sure to record the DTC in the verbatim Check wiring harness for circuit faults including bent/backed out pins and rectify as required AND replace backrest heater mats
Both seat cushion and backrest heater mats are generating heat continuously although heating is switched off	NOTE: DTC s that could be set - B1030-87/B1031-87/B1032-87/B1033-87/B14E0-87/B14E1-87 Yes	Seat heater module heater output short circuited to power Short circuit to power in seat cushion heater mat	NOTE: Only replace the defective unit, DO NOT replace in sets. Make sure to record the DTC in the verbatim Replace the seat cushion heater mat
Both seat cushion and backrest heater mats are generating heat continuously although heating is switched off	No	Power and ground circuits have reversed voltage	Check wiring harness for circuit faults including bent/backed out pins and rectify as required
Seat cushion and backrest heater mats not generating heat although heating is switched on	No	Wiring harness issue Seat heater module LIN bus failure	Check wiring harness for circuit faults including bent/backed out pins and rectify as required Replace the seat cushion heater mat