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14.3a Heated Seats (HS)   >   14 Diagnosis - Complaint Related Diagnostic Chart

Preparation for Test: The switches (left/right) for the front heated seats are integrated into the Front HS Control Module (N25/5). The control module can only be replaced as a complete unit. 1. Review section 0, 20, 22, 23 2. Review following documents in WIS: GF00.19-P-1000A.. Also review ETM documents: PE91.00-P-1100B (model 170), PE91.00-P-1100D Models 208, 202) and PE91.00-P-1100A (model 210). Complaint/Problem Possible cause Test step/Remedy 1) Entire front seat (left and right) heater system does not function. Front HS control module (N25/5), voltage supply 23 1.0 Left front seat cushion and seatback heating does not function. Front HS control module (N25/5), voltage supply Left front seat cushion heater element (R13/1) and left front backrest heater element (R13/2) 23 1.0, 23 5.0, 23 6.0 Right front seat cushion and seatback heating does not function. Front HS control module (N25/5), voltage supply Right front seat cushion heater element (R13/3) and right front backrest heater element (R13/4) 23 1.0, 23 7.0, 23 8.0 Indicator lamps in left front HS switch (N25/5s1) or right front HS switch (N25/5s2) do not function. Seat heating does function. N25/5s1 indicator lamps N25/5s2 indicator lamps Front HS control module (N25/5). Front HS control module (N25/5). Dimming of indicator lamps in left front HS switch (N25/5s1) or right front HS switch (N25/5s20) does not function. N25/5s1 dimming N25/5s2 dimming 23 2.0, 3.0, 4.0 23 2.0, 3.0, 4.0 Illumination of indicator lamps in left front seat heater switch (S51/1) or right front seat heater switch (S51/2) does not function. N25/5s1 or N25/5s2 illumination 23 2.0, 3.0, 4.0 Front HS control module (N25/5). 1) Observe Preparation for Test, see 22.