Power Seat Repair
This report applies to a 2004 Chrysler Pacifica, but the information applies to any Chrysler vehicle. The same control scheme is used on all other vehicles with power seats. If your car is a pile of junk, you can come here: https://scrap4cash.com/how-to-scrap-a-car-in-toronto/.
I’ve lost the ability to move the seat horizontally. In this case, it is not necessary to run to the car service, and it is quite possible to fix the problem with your own hands. Firstly you should get a set of schemes of car electrics. I called all the control harnesses from the fuse box to the servo connecto
All harnesses and connectors were serviceable. And when testing it is necessary to move the wires at the entrance to the pads, to find the missing contact and possible fracture of the wire inside the insulation. It is wise to test the wires when the connectors are connected, then the whole chain is checked at once: contact of the pads, serviceability of the wires.
Then I checked the seat actuators by applying 12 volt voltage to the electric motors. All electric motors appeared to be serviceable.
A typical block diagram on any electrified seats is as follows: power cables from the fuse block, through control relays, supply voltage to the servos. And the relay block can be located next to the fuses, or it can be taken out. For example, in the control and memory module of the seats. The control keys (in my case on the door cards) give the signal to the relay module to turn on the servomotors. If the seat is not equipped with memory – the control keys are directly connected to the relay unit. If there is a position memory – there is a control and memory unit under the seat.
As a rule, it is this module that is the weak link in the electric seat actuator system. In my case there was a loss of contact at the junction of the terminal block with the control board.
After soldering the terminal board, the problem was solved and the operation of the actuator was restored.