Seats - Design and Function (Xc): Other Volvo V70 II

Downloading software and replacing the control module

New software can be downloaded into the power seat module. When ordering software, the hardware and the software in the car is compared to the Volvo central database. If the comparison is OK the software is downloaded to the control module.

If the comparison between the car and 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 on Volvo's 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. 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 calculates the current required by the motors. A current limit can be set to protect the wiring from high currents.

1. There is a parameter which detects when the seat has reached its limit position, in other words blocked motor. (Programmable)
2. There is a parameter for detecting short-circuits (Can be read off).

The value of the current for a blocked motor can be set using the diagnostic tool. 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 removed if it is deactivated.

Function, power seat module

See Function

Signals

The chart below summarizes input and output signals to and from the power seat module (4/52). The signal types are divided into directly connected signals, serial communication and Control area network (CAN) communication. The illustration below displays the same information with the Volvo part numbers.

Scheme 1004

Control panel

There are two different types of control panels. In vehicles with power seats without memory, the control panel is directly connected to the motors and does not have a power seat module (PSM).

In vehicles with power seats with memory, the control panel is directly connected to the power seat module (PSM). An easy way of differentiating between power seats with memory and power seats without memory is to look at the control panel. Seats without memory do not have memory buttons 1- 3 or a programming button.

This information refers to seats with memory (with a power seat module (PSM)) unless otherwise stated.

The control panel is connected to the control module via wiring that is integrated in the control panel. The entire control panel must be replaced if there is a fault with the wiring or the panel.

The panel is used to transmit input signals to the control module from the user

1. Runs each of the four motors in the direction required
2. Memory buttons. Input signal indicating the position of the buttons (Memory 1, 2 and 3 and the programming button)
3. Ground
4. To detect that a control panel is connected to the control module.

If there is no supply to the control panel, because of an open-circuit in the cable for example, the control module will not register any input signals from the control panel. If a cable breaks only that function will fail. For example Memory 1 cannot be programmed but the other memories are functioning.

The wiring cannot be replaced separately. The entire control panel must be replaced if there is a fault.

There are diagnostics for the control panel.

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.

1. There is a parameter which detects when the seat has reached its limit position, in other words blocked motor. (Programmable)
2. 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.

Function, power seat module (PSM)

See Function

Control module

The primary task of the power seat module (PSM) is to manage the functions for

1. seat operation
2. storage of memory positions (seat positions only).

The control module is under the seat on the driver's side. The seat must be removed in order to replace the control module.

The power seat module (PSM) communicates with directly connected components and with other control modules via CAN communication.

The control module checks activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored in certain cases if the control module detects a fault.

Any diagnostic trouble codes (DTCs) are stored in the control module memory. The data can be read off using VIDA.

A simple way to check that the power seat module is supplied with power and grounded is to move the seat.

If the voltage is below 8.5 V or above 16.0 V, the power seat module (PSM) will not function. If the voltage increases to above 9.0 V or falls below 15.5 V, the control module will function again.

For further information, also see Signals .

The chart below summarizes input and output signals to and from the power seat module (PSM) (4/52). The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication. The illustration below displays the same information with the Volvo component designations.

Scheme 1005