Scheme 1002
There are two different types of control panels. In cars with power seats without memory, the control panel is directly connected to the motors and does not have a power seat module.
In cars with power seats and memory, the control panel is directly connected to the power seat module. An easy way of differentiating between power seats with memory (power seat module) 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 (power seat module) unless otherwise stated.
The control panel is connected to the power seat 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
- Runs each of the four motors in the direction required
- Memory buttons. Input signal indicating the position of the buttons (Memory 1, 2 and 3 and the programming button)
- Ground
- 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.
The control panel can be diagnosed.
Introduction, Volvo on-board diagnostic (OBD) system
The control module has a built-in diagnostic system, the Volvo on-board diagnostic (OBD) system, which continuously monitors itself and its input and output signals.
Reading off control module identification
VIDA identifies the control modules by reading off a number of codes from control module memory.
The codes contain information about control module
- P/N hardware (control module without software)
- serial number hardware (control module without software)
- P/N software
- P/N diagnostic software
Scheme 1003
The task of the power seat module is to manage the following functions
- Seat maneuvering
- 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 is directly connected to components and to other control modules via CAN communication.
The control module checks activations and input and output signals through an integrated diagnostic system A diagnostic trouble code (DTC) is stored in certain cases if the control module detects a fault.
Diagnostic trouble codes (DTC) are stored in the control module memory. The data can be read off using the diagnostic tool.
A simple way to check that the power seat module (4/52) 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 will not function. If the voltage increases to 9.0 V or falls to 15.5 V the control module will function again.
For information, also see Signals .
Introduction, Volvo diagnostic
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.
VIDA identifies control modules by reading off a number of codes from the control module memory. The codes contain information about the control module
- hardware P/N (control module without software)
- hardware serial number (control module without software)
- software P/N
- diagnostic software P/N.