ML 320 (163.154) V6-3.2L (112.942) (1998)
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Seat Heater: Description and Operation
GF91.30-P-0003GH Heated Seats (HS), Function
GF91.30-P-0003GH Heated Seats (HS), Function
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with CODE (873) Left and right front heated seats
Function prerequisites
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Switch-on prerequisites for convenience control fulfilled
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"Engine running" recognized by all-activity module (N10) via C. 61e
General
The heated seat has two heating stages. Heating stage I "normal heating" and heating stage II "quick heat-up". The all-activity module (N10) controls the
switch-on time for the heated seats by means of two timer elements.
Upon recognition that the heated seat switch is actuated the associated timer element actuates the heated seat relay, stage I (K59) and/or heated seat
relay, stage II (K59/1) switching power to the heating elements connected to circuit 30.
These are then heated by the power flowing through. When heating stage I is switched on the heater elements R13/1 and R13/2 or R13/3 and R13/4 are
connected in series. The heated seat is switched off automatically after expiration of the time t1= 20 min.
When heating stage II is switched on the heating elements R13/1 and R13/2 or R13/3 and R13/4 are connected in parallel. After expiration of time t2 =5
min. the seat is switched back to heating stage I automatically. If the battery voltage is <= 11 V the heated seats cannot be switched on. If the battery
voltage drops to <= 11 V while the heated seats are switched on, they are switched off automatically.