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What do seat heating LO and HI mean?
Seat heating; LO is hot and low HI is hot.

Precautions for using heated seats:

(1) The seat heating device can only work when the ignition switch is turned on;

(2) In order to protect the heating parts of the seat heating device, please don't kneel on the seat or put some load on the seat surface and backrest;

(3) If the vehicle voltage drops, the seat heating device will be automatically turned off to ensure that the engine control system has enough power supply.

Extended data:

The lower layer is a layer of non-woven fabric, the heating wire is arranged on the non-woven fabric, the heating wire is fixed on the non-woven fabric with a fixing belt, the knitted fabric is covered on the fixing belt, and the shape is similar to that of the seat heating part through knitting seam, and the heating wire is sewn in the seat cover.

In order to improve the comfort of the occupants in the car and control the heating temperature of the seat within a certain range, two temperature controllers are arranged in the seat heating pad:

(1) 50 5℃ off, 30 5℃ on;

(2) Disconnect at 43 5℃ and connect at 23 5℃. The backrest heater is connected to the power supply of the seat cushion heater through the connector, and the power supply of the seat cushion heater is connected to the instrument panel harness through the connector, and then connected to the battery power supply through the seat heating switch, fuse and ignition switch.

Baidu encyclopedia-seat heating