Special Service Message 52919 - 2025 Nautilus - Heated-Only Front Seats - DTCs B103A:15, B1034:13, B1036:13, And B1038:15 Setting In The HVAC Module When A Diagnostic Self-Test Is Performed

[Haz]

SSM 52919 - 2025 Nautilus - Heated-Only Front Seats - DTCs B103A:15, B1034:13, B1036:13, And B1038:15 Setting In The HVAC Module When A Diagnostic Self-Test Is Performed

 

Some 2025 Nautilus vehicles with heated-only front seats (minor feature code BY1AC) may set diagnostic trouble codes (DTCs) B103A:15, B1034:13, B1036:13, and B1038:15 in the heating, ventilation, and air conditioning (HVAC) module when a diagnostic self-test is performed. These DTCs have no affect on functionality, and should be ignored if no other DTCs are present in the HVAC and no symptoms are present. Continue with diagnosing any other HVAC DTCs first. No further service action is required.

 

[Bunky]

A 2025 Nauti SSM that does not apply to the 2024) SSM already!!

 

We still want out 3Q software update!

Edited September 18 by Bunky

[Haz]

It's worth noting that heated/ventilated driver and passenger seats were standard equipment on the 2024 Nautilus Premiere (101A/102A).

 

The 2025 Nautilus Premiere (101A) is equipped with heated-only driver and passenger seats  and the 2025 Nautilus Premiere (102A) is equipped with heated/ventilated driver and passenger seats.

 

So, the 2025 Nautilus Premiere (101A) has been de-contented to heated-only front seats.

 

Nautilus Workshop Manual descriptions of the front seat climate-control system are identical for the 2024 and 2025 model years...

 

Placing your device cursor over underlined acronyms may yield popup full-words descriptions of the acronyms.

 

Heated/Ventilated Seat Operation

The heated/ventilated seat system consists of the following components:

• Seat cushion heater mat
• Seat backrest heater mat
• Blower motor, located within each front seat cushion and backrest
• Touchscreen (includes heated/ventilated seat buttons)
• DSM
• SCMB
• Cushion and backrest vent bags (part of the cushion and backrest foam)
• Air duct (bellow)
• Cushion and backrest foam
• Cushion and backrest trim covers

 

The driver and passenger heated/ventilated seat buttons are selected from the touchscreen. The heated/ventilated seat system functions independently from the vehicle's climate control system.

 

The driver front seat is controlled by the DSM . The passenger front seat is controlled by the SCMB .

 

Heat Operation

• When activated, the DSM / SCMB supplies voltage to the selected seat heater circuit. Each seat cushion heater mat and backrest heater mat is connected in a series circuit to the DSM / SCMB and powered by the output circuit for that seat. The DSM / SCMB monitors inputs from a temperature sensor located in each seat cushion heater mat, and maintains seat temperature by cycling the heater circuits on/off. The heated seat remains ON until the heated seat switch button is pressed to cycle the DSM / SCMB OFF or the ignition is set to OFF.

Ventilation Operation

• The seat cushion and backrest are each equipped with a blower motor assembly. Each blower motor draws air through the surface of the cushion and backrest through the foam. Once the system is activated, the DSM / SCMB controls the blower speed depending on the ventilated seat settings.

 

Good luck!

 

Edited September 18 by Haz