Power Seat Control Module: Testing and Inspection

Downloading software and replacing the control module
New software can be downloaded into the engine power seat module (PSM). When ordering software, the hardware and the software in the car is compared to the information in the Volvo central database. If the comparison is OK the software is downloaded to the control module.
If the comparison between the car and the Volvo central database does not correspond, the database is updated with the configuration of the car. New software is downloaded after the update is complete.
A control module may already have software installed which will result in incorrect information being updated in the Volvo Central Database. To avoid this, tick the box in the VIDA software manager indicating the software has been replaced when the control module has been replaced.
A number of customer parameters can be programmed into the power seat module (PSM). These customer parameters are stored in the control module but not in the Volvo central database. This means that the customer parameters must be reprogrammed when the hardware is replaced and when downloading software.
The power seat module (PSM) calculates the current required by the motors. A current limit can be set to protect the wiring from high currents.
- There is a parameter which detects when the seat has reached its limit position, in other words blocked motor. (Programmable)
- There is a parameter for detecting short-circuits. (Can be read off).
The value of the current for a blocked motor can be programmed using VIDA. When programming, the value of the blocked motor must be less than the value for a short-circuit. If this is not the case, the control module will indicate a short-circuit in the cable when the seat is run to its limit position.
The motor stops when the current exceeds the value for a blocked motor and the control module registers no pulses from the Hall sensor. The level of current for a blocked motor can be set between 9 and 20 Amperes.
It is possible to reprogram the function so that the seat is automatically set by remote control. With this function activated the seat can be set using the remote control. This function is not available if it is deactivated.