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Pinpoint Test V: A Single Climate Controlled Seat is Inoperative - Switch Indicators May or May Not Illuminate




Seats

Pinpoint Test V: A Single Climate Controlled Seat is Inoperative - Switch Indicators May or May Not Illuminate

Refer to Wiring Diagram Set 119 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Climate Controlled Seats for schematic and connector information. Diagrams By Number

Normal Operation

The Dual Climate Controlled Seat Module (DCSM) 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 scan tool to bypass the climate controlled seat buttons on the touchscreen interface. When commanding a heat or cool mode operation in this manner, it only operates 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 setting a DTC specific to either climate controlled seat, only the affected seat is disabled by the DCSM.

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).

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- MS-CAN
- FCIM
- HVAC module
- DCSM


PINPOINT TEST V: A SINGLE CLIMATE CONTROLLED SEAT IS INOPERATIVE - SWITCH INDICATORS MAY OR MAY NOT ILLUMINATE

NOTICE: When taking measurements at Dual Climate Controlled Seat Module (DCSM) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in Diagnostic Trouble Codes (DTCs) and system failure. Touching the tip of these connector pins is recommended instead.

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V1 VERIFY CLIMATE CONTROLLED SEAT BLOWER OPERATION

- Ignition OFF.
- Remove the driver and front passenger cushion TED filters to verify blower operation.
- Turn the filter to the left (counterclockwise) and remove.
- Start the engine.
- Operate climate controlled seat buttons while verifying both blowers operate.
- Are all climate controlled seats inoperative?

Yes
GO to Symptom Chart to diagnose all climate controlled seats are inoperative. Symptom Related Diagnostic Procedures

No
If both blowers operate, GO to V3.

If only one blower operates, GO to V2.

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V2 VERIFY CLIMATE CONTROLLED SEAT INDICATOR ILLUMINATION

- Ignition OFF.
- Start the engine.
- Verify system indicator illumination.
- Does any climate controlled seat indicator illuminate or flash and then turn off?

Yes
GO to V3.

No
GO to V4.

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V3 CHECK THE DCSM FOR DTCs

- Ignition In ACC.
- Enter the following diagnostic mode on the scan tool: Self Test - DCSM.
- Are any DTCs present?

Yes
GO to the Dual Climate Controlled Seat Module (DCSM) DTC Chart. Dual Climate Controlled Seat Module (DCSM) DTC Chart

No
GO to V8.

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V4 CHECK THE FCIM FOR DTCs

- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Are any DTCs retrieved?

Yes
REFER to the Master DTC Chart in Information and Entertainment Systems Testing and Inspection.

No
GO to V5.

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V5 CHECK THE HVAC MODULE FOR DTCs

- Enter the following diagnostic mode on the scan tool: Self Test - HVAC module.
- Are any DTCs retrieved?

Yes
REFER to the Master DTC Chart in Climate Control System - General Information and Diagnostics Testing and Inspection.

No
GO to V6.

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V6 MONITOR THE FCIM PIDs AND CHECK INPUTS

- Enter the following diagnostic mode on the scan tool: DataLogger - FCIM - PIDs.

- Driver Cooled Seat (CC_SW_D_CL_S)
- Driver Heated Seat (CC_SW_D_HSEATS)
- Passenger Cooled Seat (CC_SW_P_CL_S)
- Passenger Heated Seat (CC_SW_P_HSEATS)
- Monitor the FCIM PIDs while individually pushing the affected driver or passenger climate controlled seat switch buttons.
- Do the PID values agree with the switch positions?

Yes
GO to V7.

No
INSTALL a new FCIM. REFER to Information and Entertainment Systems Service and Repair. TEST the system for normal operation.

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V7 MONITOR THE HVAC MODULE PIDs AND CHECK INPUTS

- Enter the following diagnostic mode on the scan tool: DataLogger - HVAC module - PIDs.

- Driver Cooled Seat (CC_SW_D_CL_S)
- Driver Heated Seat (CC_SW_D_HSEATS)
- Passenger Cooled Seat (CC_SW_P_CL_S)
- Passenger Heated Seat (CC_SW_P_HSEATS)
- Monitor the HVAC module PIDs while individually pushing the affected driver or passenger climate controlled seat switch buttons.
- Do the PID values agree with the switch positions?

Yes
GO to V8.

No
INSTALL a new HVAC module. TEST the system for normal operation.

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V8 CHECK DCSM USING ACTIVE COMMANDS

- Enter the following diagnostic mode on the scan tool: DataLogger - DCSM - PIDs.

- Seat Cushion Thermal Electric Device Temperature (CSHTEMP)
- Seat Back Thermal Electric Device Temperature (BK_TEMP)
- Climate-controlled Seat Heat Command (TED_HEAT_D)
- Passenger Cushion Thermal Electric Device (TED) Temperature (PCSHTMP)
- Passenger Back TED Temperature (PBKTMP)
- Passenger TED Heat Mode (TED_HEAT_P)
- NOTE: The DCSM active commands TED_HEAT_D (driver seat) and TED_HEAT_P (passenger seat) are limited to 15 seconds in the ON state, then turn OFF.
- Operate the affected climate controlled seat using active commands while monitoring the appropriate PIDs.
- When the command is in process, the TED temperature PIDs on the affected seat being commanded should momentarily increase. If no temperature increase is noted, remove the cushion blower filter and repeat the active command while physically monitoring the cushion blower for fan movement.
- Do the PID states or cushion blower movement indicate climate controlled seat operation?

Yes
CHECK for causes of the intermittent fault. INSPECT the connectors, terminals and wiring. ATTEMPT to recreate the fault by flexing the wire harness and operating the system. CHECK the electrical connectors for corrosion, poor pin contact or pushed-out pins. REPAIR any intermittent concerns found and TIGHTEN any loose HVAC module connector pins. REPEAT the self-test. CHECK the system for normal operation.

If no intermittent concerns are found, CARRY OUT the Component Test - Thermo-Electric Device (TED) Cooling Performance for both seats. Component Tests and General Diagnostics

REPEAT the self-test.

No
INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM) Dual Climate Controlled Seat Module (DCSM). REPEAT the self-test. CLEAR the DTCs.

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