Temperature contols that you turn are on the console. one for passenger and one for the driver. The drivers control are completely out. and Passenger control is half out. I thought this would be a bulb replacement to correct the lights but was told by the Volvo dealer the whole control assembly would have to be replaced. The controls still operate correctly and the lights in between are still on (where the person is sitting and auto is on top. Is it correct that the whole assy. willl need replacing and if so what should I order for a replacement. Can I replace this or should the Volvo dealer replace it and what would the cost be. Or is it possible to get from a junk yard. I am currently in Germany and will have to deal with getting parts here.
Thank in advance for your help
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Heated Seat Components
The heated seat system consists of the following components:
• Driver and passenger heated seat switches
• Driver and passenger seat back heater elements
• Driver and passenger seat cushion heater elements
• Driver and passenger seat back temperature sensors
• Driver seat module
• Driver door module
• Passenger door module
When there are modules involved in the operation of any componet that's acting up , the module's electronic's could be the culprit ! But without testing who's to say what the problem could be !
I would have it check for DTC'S
DTC B2425 or B2430
The driver and passenger seat heaters are controlled by the driver seat module. Power is supplied to the driver seat cushion and back heater elements through individual voltage supply circuits. Power is supplied to the passenger seat cushion and back heater elements through a common voltage supply circuit. All of the driver and passenger seat heater elements are grounded by the driver seat module through individual low side drive control circuits. The heater element control circuits are pulse width modulated to ground by the driver seat module in order to control the seat temperatures by regulating the current flow through the heater elements.
DTC B2435 or B2440
The driver seat module relies on inputs from thermistors installed in the driver and passenger seat backs to control heated seat temperatures. The thermistors are 2-wire sensors supplied with a 5-volt referenced signal circuit and low reference circuit from the driver seat module. Resistance through the thermistors varies with temperature causing the heated seat sensor signal circuit voltage levels to decrease as the seat back temperatures rise.
Install a scan tool.
Start the engine.
Turn the heated seat ON.
With a scan tool, observe the Heated Seat Sensor parameter in the data list for the driver seat module.
Does the scan tool indicate that the heated seat sensor parameter is within the specified range?
I had a similar problem with my Chev pickup. Try going to a wreckers and pickup the switch to replace the one currently in your armrest or door panel. That was my issue. Otherwise it could be a wiring issue and that's a lot of work or a lot of repair$.
Hello: You have a failed temperature control actuator for the passenger air mix door. Remove the glove box and the close out panel under the dash on the passenger side. You will see two silver rods going from the actuators (mounted on the top and bottom of the heater/a/c programmer) Turn key on (engine off) Turn the a/c heater control on. Go from 60 to 90 or 90 to 60 and watch the rods the one that doesn't move is the failed one. The actuator is held in place by two 7mm screws and one electrical connector. When installing the new actuator have the temp set at 60 when you hook up the linkage. The passenger side set at full cold.
OK, do you have 'zoned' cooling where the passenger side can have a lower or higher temperature depending on a setting on the heating/ventilation/a/c console?
This is the way my Cadillac Deville is, it actually has a knob on the passenger side for the passenger to control temperature.
Good luck on this.
Also, make sure the system is charged up fully with r134a.
You have dual zones that are controlled by temperature actuators the passenger side has lost its memory or has gone bad you can put it in self programming by disconnecting the battery for ten minutes then hook it back up start the truck turn the temperature control on but do not touch any other controls let it go thru the self programming for about 6 to 7 minutes then select your temperature you want if it still does not work properly you may have a bad actuator or a bad connection at the actuator