Front Seats — 2016 workshop reference 1024

The SCME is supplied voltage at all times, but the climate controlled seat system only operates with the engine running. The system can be operated with the ignition ON engine OFF by using a diagnostic scan tool to bypass the climate controlled seat switches on the touchscreen and FCIM. When commanding a heat or cool mode operation in this manner, the climate controlled seat system only operates in 15 second intervals.

Both voltage supply circuits are spliced together internal to the SCME, so if one circuit becomes open, both seats can still be operated. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat is disabled by the SCME.

Cabin air is drawn through and distributed to each of the blower motors located in the seat cushion and backrest. The blower motors then heat or cool the air. The air is then directed into the foam pad where it is distributed along the surface of the cushion and backrest of the seat. Once the system is activated, the SCME uses a set of flexible algorithms to control the heating/cooling modes and the blower speed dependant on the commanded climate controlled seat settings.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
	B103D Blower Driver Overtemperature	If the SCME outputs to the driver seat blower or any components within these circuit loops are shorted to ground or cause an excessive current draw, the SCME overheats, shuts down the driver seat system and sets this DTC.

DTC

Description

Fault Trigger Conditions

B103D Blower Driver

Overtemperature

If the SCME outputs to the driver seat blower or any components within these circuit loops are shorted to ground or cause an excessive current draw, the SCME overheats, shuts down the driver seat system and sets this DTC.

Possible Causes

Wiring, terminals or connectors Backrest blower motor Cushion blower motor SCME

PINPOINT TEST N : DTC B103D

WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

N1 CHECK THE BLOWER MOTOR FEED CIRCUIT FOR A SHORT TO GROUND

REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures). Disconnect: Driver Side Airbag In-line C345. Disconnect: Passenger Side Airbag In-line C219. Disconnect: Driver Seat Backrest Blower Motor C3034. Disconnect: Driver Seat Cushion Blower Motor C3035. Disconnect: SCME C3265C. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C3265C-16		Ground

Is the resistance greater than 10,000 ohms?

Yes	GO to N2
No	REPAIR the circuit. GO to N5

N2 CHECK THE BLOWER MOTOR FEED CIRCUITS FOR A SHORT TOGETHER

Ignition ON. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C3265C-16		C3265C-15

Is the resistance greater than 10,000 ohms?

Yes	GO to N3
No	REPAIR the circuits. GO to N5

N3 CHECK THE BACKREST BLOWER AND CUSHION BLOWER RESISTANCES

NOTE: The ohmmeter must be connected with the positive lead to pin 3 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty. Measure the component side resistance between:

Source reference 1024

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.