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14.2a Heated Seats (HS)   >   11 Diagnosis - Function Test

Test step/Test sequence Test condition Nominal value Possible cause/Remedy 1) 1.0 Seat heating stage I Ignition: ON Press front of left front seat heater switch (S51/1) or right front seat heater switch (S51/2), respectively. Switch indicator lamp for stage I lights up. Seat cushion and back rest cushion warm up. 23 1.0, 3.0, 10.0 23 4.0, 5.0, 6.0, 11.0 2.0 Seat heating stage II Press rear of left front seat heater switch (S51/1) or right front seat heater switch (S51/2), respectively. Switch indicator lamp for stage II lights up. Seat cushion and back rest cushion warm up noticeably more than in Stage I. 23 1.0, 3.0, 10.0 23 4.0, 5.0, 6.0, 11.0 3.0 Dimming of indicator lamps in stages I or II Ignition: ON Seat heaters switched on. Parking lamps switched on. Switch indicator lamp for stage I or II lights up brightly. Indicator lamps become dimmer. 23 9.0, 14.0 4.0 Model 140 only Seat heating switches off with ignition: OFF When engine is restarted, or ignition is switched on, the seat heater is switched ON again automatically. Ignition: ON Left front seat heater switch (S51/1) or right front seat heater switch (S51/2), respectively in stage I or II. Ignition: OFF Ignition: ON Seat heating: ON Seat heating: OFF Seat heating automatically: ON 23 1.0 5.0 Model 140 only with 8 or 12 cylinder engines Increased idle speed at idle with seat heating in stage II. Engine runs, seat heating switched on. Stage I Stage II - Idle speed increase approx. 100 rpm. 23 15.0 1) Observe Preparation for Test, see 22.