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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seat System - Seats >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test L: A Single Climate Controlled Seat is Inoperative - Switch Indicators May or May Not Illuminate >> Normal Operation

Normal Operation

The Dual Climate Controlled Seat Module (DCSM) is supplied voltage from Battery Junction Box (BJB) fuse 22 (30A) to C3265a pins E and F, circuit CBX01 (GN/RD). The DCSM is supplied ground from C3265a pin M, circuit GD903 (BK/WH). Both voltage supply circuits are hot at all times but the climate controlled seat system only operates with the engine running. When commanding a heat or cool mode operation with the scan tool, the system will only operate in 15-second intervals. Both voltage supply circuits are spliced together internal to the DCSM, so if one circuit becomes open, both seats can still be operated. However, if a fault occurs specific to either climate controlled seat, only the affected seat will be disabled by the DCSM.

When equipped with navigation, climate controlled seat button commands are communicated from the Front Controls Interface Module (FCIM) over the Medium Speed Controller Area Network (MS-CAN) to the HVAC module and then to the DCSM. Upon receiving a command, the DCSM then communicates indicator illumination commands back to the HVAC module which then commands the FCIM to turn the indicators on or off. No direct connection exists between the FCIM, HVAC module and DCSM. The climate controlled seat system can only operate if all 3 modules are communicating correctly on the Controller Area Network (CAN).

When not equipped with navigation, climate controlled seat button commands are communicated from the HVAC module over the MS-CAN to the DCSM. Upon receiving a command, the DCSM then communicates indicator illumination commands back to the HVAC module to turn the indicators on or off. No direct connection exists between the HVAC module and DCSM. The climate controlled seat system can only operate if both modules are communicating correctly on the CAN.

This pinpoint test is intended to diagnose the following: 

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