Cooled Seats

[GTEyes]

As expected with these sort of things, it didn't do it a single time on the drive home. However, I had the HVAC system off, so perhaps that adds some strength to the idea of electric loading being the cause. They did replace the battery in my Edge before I took delivery 🤔

 

I will continue to monitor and see what I observe!

 

Side note, had to pull away quickly from a stop sign and I am still so impressed with the torque of this engine. It's a gem!

[Haz]

From the 2024 Edge Workshop Manual...

 

Auto-Start-Stop System

The Auto-start-stop system helps reduce fuel consumption by automatically shutting off the vehicle’s engine while the vehicle is at a complete stop and restarting the engine when the brake pedal is released. The system can be disabled through the auto-start-stop control switch on the instrument panel centerstack. The Auto-start-stop system is automatically enabled whenever the ignition is turned on.

 

The engine automatically restarts when:

• the brake pedal is released.
• the Auto-start-stop system is disabled through the auto-start-stop control switch on the instrument panel centerstack.
• the battery has a low state of charge.
• it is necessary to maintain interior comfort.
• the blower fan speed is increased or the climate control temperature is changed.
• an electrical accessory is turned on or plugged in.
• there is low brake vacuum.

The Auto-start-stop system may not turn the engine off under these conditions:

• the HVAC system is in A/C, heat or defrost modes.
• the rear defroster is on.
• the battery has a low state of charge.
• the battery temperature is below 5°C (41°F) or above 60°C (140°F).
• the engine temperature is below 46°C (115°F).
• the engine temperature is below 60°C (140°F) and the HVAC system is in heat mode.
• the gear selector is not in Drive or Sport Mode.
• the steering wheel is turned rapidly or is at a sharp angle.
• vehicle speed of greater than 4 km/h (2.5 mph) for more than 2 seconds has not occurred.
• the vehicle is on a steep road grade.
• elevation is approximately above 3,048 meters (10,000 feet).

 

And...

 

Direct Current/Direct Current (DC/DC) Converter Control Module - System Operation and Component Description

 

System Diagram

 

System Operation

Network Message Chart

 

Broadcast Message	Originating   Module	Message Purpose
Engine status	PCM	Used to indicate the type of cranking event occurring. If the signal is state 2, Engine Auto Stopped, then the next commanded crank is to be supported. If the signal is state 0, Engine Off, the next crank will be a key crank and the Direct Current/Direct Current (DC/DC) converter control module will not support.

 

The Direct Current/Direct Current (DC/DC) converter control module, also known as the Voltage Quality Module (VQM), is responsible for boosting battery voltage to specific components on vehicles equipped with the auto-start-stop system. When the ignition is turned on the Direct Current/Direct Current (DC/DC) converter control module initializes after receiving the Run/Start power feed from the BCM controlled run/start relay.

 

While in stand-by mode the Direct Current/Direct Current (DC/DC) converter control module performs self-diagnostics and is not producing any boost output voltage. The Direct Current/Direct Current (DC/DC) converter control module is simply passing battery voltage straight through to downstream loads when it is in stand-by mode.

 

The Direct Current/Direct Current (DC/DC) converter control module continuously communicates it's status to the PCM via High Speed Controller Area Network (HS1-CAN). If the Direct Current/Direct Current (DC/DC) converter control module is overloaded, overheated, or other faults are present the PCM disables the auto-start-stop system. If a fault is detected, the PCM may restart the engine if an auto-start-stop event is already in progress. During an auto-start-stop event the engine shuts down automatically after vehicle speed is zero. As the engine begins shutting down, there is an initial battery voltage drop due to the engine shutting off and the alternator no longer providing output current.

 

Once the engine is no longer spinning, the electrical system is fully supported by the vehicle battery. The electrical load present in the engine off phase of the auto-start-stop event causes a gradual decline in battery voltage. This gradual decline of battery voltage is the second voltage transition. The third voltage transition occurs during the engine restart. The system voltage drops, followed by the system voltage increasing to the regulation voltage point determined by the alternator output.

 

Prior to the engine restart, the PCM sends a low-side drive command to the the low voltage Direct Current/Direct Current (DC/DC) converter. The low voltage Direct Current/Direct Current (DC/DC) converter is switched into Boost mode to stabilize/boost its output until the engine has started and system voltage regulation is established by the alternator. The converter provides the stabilized or boost output voltage until one of the following occurs:

• Boost time exceeds 5 seconds
• System input voltage exceeds targeted output

The Direct Current/Direct Current (DC/DC) converter control module has full bypass or stand-by mode functionality within an input of 6V-16V. The Direct Current/Direct Current (DC/DC) converter control module must be able to provide the boosted voltage with a minimum 6V power net input voltage. If the supply voltage goes outside the voltage range, the Direct Current/Direct Current (DC/DC) converter control module recovers without user intervention when the supply voltage returns to the normal operating range. The Direct Current/Direct Current (DC/DC) converter control module determines the stabilized output voltage to be targeted by continuously measuring the Direct Current/Direct Current (DC/DC) converter control module input voltage. Prior to the restart event, the Direct Current/Direct Current (DC/DC) converter control module receives the RE-CRANK signal and sets the boosted output voltage target to be equivalent to the measured input voltage. This makes sure the output voltage to the supported loads does not change.

 

Malfunction of the system does not lead to non-function of other vehicle systems. The system enters bypass mode if:

• a thermal overload condition exists.
• there is a Direct Current/Direct Current (DC/DC) converter control module failure.
• the output voltage is more than 1V below input voltage and voltage boost is not available.

The Direct Current/Direct Current (DC/DC) converter control module self-protects against overheating and self-recovers without user interaction after an overheating event and is internally protected from short-circuits.

 

Component Description

The Direct Current/Direct Current (DC/DC) converter control module is connected in series between the high current fuse box and a select number of non-safety electrical loads. The majority of the loads are fused through the BCM and remaining loads are not fused and are switched on by a smart transistor located internal to the Direct Current/Direct Current (DC/DC) converter control module. The smart transistor acts as a fuse and shuts off power in the event of a short to ground. The Direct Current/Direct Current (DC/DC) converter control module has a dedicated body ground and incorporates a hardwired signal circuit from the PCM which notifies the Direct Current/Direct Current (DC/DC) converter control module prior to the engine cranking during an auto-start event.

 

Good luck!

[ben senise]

the real solution is to take back control and install this:

 

https://www.autostopeliminator.com/collections/ford/products/2021-ford-edge-autostop-eliminator

 

no affiliation. i have one and am 100% happy with it. when my engine stops for 1 second every time i stop at a stop sign when leaving my home and the temps are near freezing, i simply cannot believe that this is beneficial for the engine or the environment. sure, sitting at a red light for a few minutes i understand but then i can manually engage this feature.

[STBEAST]

Kudos to ben. Auto start stop is worse on an engine than stop and go traffic.  What a great suggestion. Thanks for the info!

[1004ron]

I'm surprised that the Auto Stop Start can't be disabled with Forscan - soon after we bought a BMW X5 for my wife I used Bimmercode ($50 app) to code the ASS default to OFF.

 

Edit:

If it can be done on the F150 it should be possible on the Edge.

 

Edited July 14 by 1004ron

[Wubster100]

I though the auto start stop is disabled in FORScan by disabling the BMS.

[GTEyes]

A little more on this issue. Noticed this morning that the fans for the ventilated seats were surging (making more then less noise). Sounds like something is going on with the part. I will have to get it looked at next service.

 

[GTEyes]

Adding this to my next service appointment.

Here's a video of the seat fan surging.

Anyone ever see or hear this occur on their vehicles?

Edited November 26 by GTEyes

[GTEyes]

Another update. Both the seats do this...driver and passenger.

Sounds like there is a fan in the back cushion that is also turning off and on...I thought only the bottom cushion was ventilated?

 

Service appointment at the end of the month so we will see what they say.

 

 

[Haz]

@GTEyes: From the 2022-2024 Edge Workshop Manual, with emphasis added...

 

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

 

Climate Controlled Seat Operation

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

 

The seat cushion and backrest are each equipped with a blower motor assembly. As cabin air is drawn through each blower motor, a Thermo-Electric Device (TED) heats or cools the air, which 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 dependent on the commanded climate controlled seat settings.

 

The SCME monitors seat cushion temperature while it supplies voltage and ground to both blower motors.

 

The SCME also supplies a variable voltage signal to control the blower speed. Cabin air enters the blower through an integrated filter attached to the blower motor housing. Heated or cooled air exits the blower motor and flows through the foam pad.

 

Climate Controlled Seat Heating Characteristics

• The system control settings are indicated next to each climate controlled seat heat switch button. The first setting is HIGH (3 indicators), the second setting is MED (2 indicators) and the third is LOW (1 indicator) then OFF (no indicators).
• When heating, the SCME varies the speed of the blower motors and the duty cycle of the integral Thermo-Electric Device (TED) in order to reach and maintain the desired temperature determined by the system control settings.

Climate Controlled Seat Cooling Characteristics

• The system control settings are based on the 3 indicators next to each climate controlled seat cool switch button. The first setting is HIGH (3 indicators), the second setting is MED (2 indicators) and the third is LOW (1 indicator) then OFF (no indicators).
• When cooling, the SCME maintains a constant blower motor speed and a constant Thermo-Electric Device (TED) supply voltage (duty cycle is determined by the switch setting) in COOL mode.

Climate Controlled Seat Recovery Mode

NOTE: The presence of overtemperature faults (Diagnostic Trouble Codes (DTCs) B1153:4B, B1154:4B, B1151:4B and B1152:4B) can be induced by incorrectly operating the climate controlled seat system after an initial heat setting has been attained. If a heat setting is repeatedly turned off and on in an attempt to increase the seat temperature or repeatedly toggled between heat and cool modes, an overtemperature condition can result and the Diagnostic Trouble Codes (DTCs) may be set.

 

If the temperature of one of the blower motors rises above 110° C (229.8° F) in the heat mode or 65° C (149° F) in the cool mode for more than 4 seconds, the SCME records an overtemperature DTC , removes voltage from the Thermo-Electric Devices (TEDs) (part of the blower motor assembly) and goes into recovery mode (blower only) for 30 seconds to cool down the blower motor. The same occurs if a temperature difference of 60° C (140° F) or greater is detected between the backrest and cushion blower motors on either front seat. The SCME continues to monitor the blower motors while in recovery mode. If the temperature of the Thermo-Electric Devices (TEDs) do not drop to 105° C (220.8° F) in the heat mode or 60° C (140° F) in the cool mode after 30 seconds, the system continues to cool the blower motors in recovery mode for up to 5 minutes. If the Thermo-Electric Devices (TEDs) cool down after 30 seconds, but before 5 minutes (checked at 4 second intervals), the system is operating normally. An overtemperature DTC is still recorded even if the system recovers and is operating normally. This is more likely to occur during extreme cabin temperatures with significant seat back sun load. If the system does not recover within 30 seconds in heat mode or within 5 minutes in cool mode, the SCME disables that seat (fault mode) and remains off until the ignition is cycled. Also, if the SCME detects a temperature differential fault twice during the same ignition cycle, the SCME disables the seat. When a fault causes a shutdown, the climate controlled seat indicators turn off and that seat is not operational until the next ignition cycle.

 

Good luck!

[GTEyes]

Can someone with the ventilated seats  try turning them on after a cold start in a climate that is close to freezing to see if their seats do the same thing?

 

I suspect the behaviour is normal.