P0442 Evaporative Emission Control System Leak Detected (small leak) https://www.obd-codes.com/p0442 The vehicle's PCM (powertrain control module) tests the evaporative emissions (EVAP) system for large and small leaks among other conditions. In the case of this DTC, it indicates a fuel vapor leak in the EVAP control system. ... The (EVAP) emission control system prevents the escape ...
Make sure battery has a full charge and connections all good. Have a helper crank it while you check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse. Any applicable trouble codes? I don't know what testing you've done?
I'm truly jealous. I thought I got lucky when I bought my 2012 Lincoln in 2017 with 57,900 original miles on it. :) I'm not 100% sure but is that old north star an aluminum block? If so, I would consult GM as to what to use to flush it with. If it was still cast iron, you could probably get away with most any flush. The one thing that I would be careful of is if the water pump is the original, try to get something that is not too corrosive to protect the old shaft and bearing seals. Some of the heavy duty over the counter flushes contain carbolic or phosphoric acid to eat the calcium and lime scale out of your radiator. This is why they used to say that Coca Cola was a good flush because it contained phosphoric and CARBONIC ACIDS. Carbonic acid being the carbon dioxide dissolved in it to give it the fizz. Good luck.
Looking at a wiring diagram for the passenger seat an checking wiring colors mite help you figure it out . But then again maybe not . Electronic's involved here , Right door module .
Heated Seat Components
The heated seats consist of the following components:
• Left heated seat switch
• Right heated seat switch
• Memory seat module
• Left door module
• Right door module
• Left seat cushion heating element
• Left seat back heating element
• Left seat cushion temperature sensor
• Right seat cushion heating element
• Right seat back heating element
• Right seat cushion temperature sensor
Modes of Operation
The heated seat module (MSM) controls heated seat operation for both the driver and passenger seats. There are 2 modes of operation available for heated seats; both the seat cushion and seat back heat, or seat back only heat. When a heated seat temperature signal request is received, the MSM will activate both the seat cushion and seat back heating elements. When the heated seat BACK ONLY mode button is pressed once the MSM will deactivate the seat cushion heating element and leave the seat back heating element ON.
Heated Seat Switch/LED Indicators and System Operation
The left and right heated seats are controlled by separate heated seat switches located in the door panels. Ground is supplied to the heated seat switches through the switch low reference circuits from their respective door modules. The door modules also control the heated seat switch heat mode and temperature indicators. The memory seat module (MSM) controls the heated seat operation for both, the left and right heated seats.
The following describes the sequence of operation and how the MSM responds to each of the switch inputs.
• High Temperature--When the heated seat switch is pressed once, ground is applied through the switch contacts and the switch signal circuit to the door module indicating the high heat request. In response to this signal, the door module applies a low current voltage through the 3 temperature indicator control circuits illuminating all 3 LEDs indicating the high temperature mode. The module then sends a message via the GMLAN serial data line to the MSM indicating the heated seat request. The MSM then applies battery voltage through the heating element supply voltage circuit to the seat cushion and seat back heating elements. At the same time, it supplies a ground through the element low reference circuits to the seat heating elements.
• Medium Temperature--When the switch is pressed a second time, the MSM sets the temperature level to medium heat. The door module removes the voltage from the high temperature indicator leaving 2 LEDs illuminated indicating the medium temperature mode.
• Low Temperature--When the switch is pressed a third time, the MSM sets the temperature level to low heat. The door module removes the voltage from the medium temperature indicator leaving 1 LED illuminated indicating the low temperature mode.
• System OFF State--When the switch is pressed a fourth time, the MSM removes the battery voltage and grounds from the heating elements. The door module removes the voltage from the low temperature indicator, indicating the system OFF state.
• Back Only Mode-When the heated seat is ON and the BACK ONLY mode button is pressed, ground is applied through the switch contacts and the heated seat back only mode signal circuit to the door module. In response to this signal, the door module sends a GMLAN message to the MSM indicating the back only mode request. The MSM then opens the ground path to the seat cushion heater element, leaving the seat back heater active. The door module turns OFF the seat cushion/back mode indicator, then applies a low current voltage through the heated seat back only mode indicator control circuit illuminating the back only mode indicator.
Know how to test an what test is the key to finding the problem .Not guessing . The connector you found may or may not have anything to do with it . What color are the wires ? I have factory service repair manual . Does it have memory seats ?
The Memory Seat System consists of the following components:
• Memory seat module (MSM)
• Seat horizontal motor
• Seat front vertical motor
• Seat rear vertical motor
• Seat recline motor
• Lumbar horizontal motor
• Seat horizontal position sensor
• Seat front vertical position sensor
• Seat rear vertical position sensor
• Seat recline position sensor
• Lumbar horizontal positional sensor
• Seat adjuster switch
• Seat lumbar switch
• Memory seat switch
• PWR SEATS Circuit Breaker 30 A
• MEMORY RPA Fuse 7.5 A
If the Stabilitrak Yaw sensor box gets full of water you will get the Service Stabilitrak message.
The 2006-2011 Cadillac DTS and Buick Lucerne have a manufacturing defect of a major water leak problem at the bottom of the driver's side A pillar just below the windshield, accessible after the air inlet grille panel under the wiper blades is removed. The GM service manual bulletin #PI0356A (June 8, 2011) vaguely outlines how to seal off this opening, see attached photo taken from this bulletin. After sealing the obvious unsealed seams, I had to use fire-block insulating foam to close off the large 1 inch remaining upper opening.
The Cadillac DTS has another water leak path in the left front hinge pillar area under the wheelhouse liner noted in the same service bulletin.
In our Lucerne CXS, water actually flooded the Stabilitrak Yaw sensor box which is under the carpet under the driver's seat, resulting in the service Stabilitrak message . It's a major chore to remove the seats, trim and center console just to get the carpets out to dry. The carpets are difficult to dry because they have 1 inch of foam attached which holds a lot of water.
After removing the carpets and sealing the obvious seams, water still poured in when tested with a water hose and it was then I discovered that the water was getting in through the large upper opening which I used fire-block foam to seal. It's best to water test before you put everything back together.
You can quickly check if you have a water leak problem in your vehicle by popping up the rear seat bottom, removing the carpet clip and lifting the carpet on the driver's side rear passenger seat. Ours had about a 1/2 inch of standing water plus a lot more held in the carpet's foam rubber.
I was able to reuse the flooded Stabilitrak Yaw sensor by opening the box, shaking out the water, rinsing the insides with isopropyl alcohol and drying with a hair dryer. The service message went out and the Stabilitrak works in my attempts to slide around on gravel.
I'm surprised that GM didn't have a recall as I consider Stabilitak to be safety equipment.