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14.2b 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 rear seat heater switch (S51/3) or right rear seat heater switch (S51/4) respectively. Switch indicator lamp for stage I lights up. Seat cushion and backrest cushion warm up. 23 1.0, 3.0, 9.0 23 4.0, 5.0 2.0 Seat heating stage II Ignition: ON Press rear of left rear seat heater switch (S51/3) or right rear seat heater switch (S51/4) respectively. Switch indicator lamp for stage II lights up. Seat cushion and backrest cushion warm up noticeable more than in stage I 23 1.0, 3.0, 9.0 23 4.0, 5.0 3.0 Dimming of indicator lamps in stages I or II Ignition: ON Rear seat heaters switched on. Parking lamps switched on. Switch indicator lamp for stage I or II lights up brightly. Indicator lamps become dimmer. 23 8.0, 13.0 4.0 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 rear seat heater switch (S51/3) or right rear seat heater switch (S51/4), 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 Only with 8 or 12 cylinder engines Increased CTP (idle) RPM with seat heating in stage II. Engine runs, seat heating switched on. Stage I Stage II Idle speed increases approx. 100 RPM 23 11.0 1) Observe Preparation for Test, see 22.