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14.2a Heated Seats (HS)   >   12 Diagnosis - Complaint Related Diagnostic Chart

Complaint/Problem Possible cause Test step/Remedy 1) Entire front seat heater does not operate. Front seat heater control module (N25/5), Voltage supply 23 1.0 Left front seat cushion and seatback heating does not operate. Front seat heater control module (N25/5), Voltage supply. Left front seat heater switch (S51/1). Model 140: Left front seat cushion heater element (R13/1) and left front backrest heater element (R13/2). Model 202: Left front seat cushion heater element (R13/1) and left front backrest heater element (R13/2). 23 1.0 23 3.0 23 4.0 23 6.0 Right front seat cushion and seatback heating does not operate. Front seat heater control module (N25/5), Voltage supply. Right front seat heater switch (S51/2). Model 140: Right front seat cushion heater element (R13/3) and right front backrest heater element (R13/4). Model 202: Right front seat cushion heater element (R13/3) and right front backrest heater element (R13/4). 23 1.0 23 10.0 23 5.0 23 11.0 Indicator lamp in left front seat heater switch (S51/1) or right front seat heater switch (S51/2) not operating. Seat heater operates. S51/1 indicator lamps. S51/2 indicator lamps. 23 8.0 23 13.0 Dimming of indicator lamps in left front seat heater switch (S51/1) or right front seat heater switch (S51/2) not operating. S51/1 dimming. S51/2 dimming. 23 2.0, 9.0 23 2.0, 14.0 Lighting of indicator lamps in left front seat heater switch (S51/1) or right front seat heater switch (S51/2) not operating. S51/1 lighting. S51/2 lighting. 23 7.0 23 12.0 Model 140 only: Seat heaters switch off with ignition: OFF Seat heaters do not switch on again when switching ignition back ON. Front seat heater control module (N25/5), Voltage supply 23 1.0 Model 140 only with 8 and 12 cylinder engine: Engine idle speed does not increase with seat heaters in stage II. Left front seat heater switch (S51/1). Right front seat heater switch (S51/2). 23 3.0 23 10.0 23 15.0 1) Observe Preparation for Test, see 22.