Driver power seat

It sounds like the switch has gone out here is a guide to show you what you are in for when changing it out. Here is a guide to help us check the power wiring to confirm the problem.

https://www.2carpros.com/articles/seat-position-switch-replacement

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

The wiring diagrams are (BELOW)

Here is a bulletin that may relate, this assumes the seat is completely inoperative from seat adjuster switch, and memory switch. If you need procedure to remove seat cushion let me know.

#06-08-50-012: Front Driver or Passenger Power Seat Adjust Functions Inoperative and/or Driver Seat Memory Inoperative (Check Power Seat Switch Connector) - (Oct 6, 2006)

Subject: Front Driver or Passenger Power Seat Adjust Functions Inoperative and/or Driver Seat Memory Inoperative (Check Power Seat Switch Connector)

Condition
Some customers may comment that the front driver or passenger power seat adjust functions are inoperative. They may also comment that the driver seat memory is inoperative.

Cause
The cause of this condition may be due to the power seat switch connector not being fully seated.

Correction
Do This
Don't Do This

Check that the power seat switch connector is fully seated.
Replace the power seat switch.

Remove the front seat cushion outer trim panel following the replacement procedure in SI. Verify that the power seat switch connector is fully seated. Reseat the connector and test the seat functions.

Please let us know what you find.

Cheers

Here is what I have, hope it helps:

Front Seat Cushion Outer Trim Panel Replacement (Power)

Callout
Component Name

1
Front Seat Adjuster Outer Finish Cover Screw

Notice: Refer to Fastener Notice in the Preface section.

2
Front Seat Adjuster Outer Finish Cover

Procedure
Squeeze the tabs in the rear of the cover together to disengage the outer trim cover from the rear trim cover.
Pull outward to release the retainers from the seat assembly.

All your doing at this point is checking that the switch is connected fully. If it is still inoperative, reply back. Include also if this seat has the memory option.

It is not the switch. If the power driver seat, and adjustable pedals are inoperative, these are all functions of the memory seat module. What I would try first, is to remove power to the memory seat module. You can do this one of two ways, disconnecting the module connector C3 a 6 pin brown connector, or pulling the DSM 10A fuse in the I/P fuse block. The module is under the drivers seat, the fuse panel is left side I/P. If you opt to pull the fuse, at least make a visual inspection of the seat module connections.

What we are trying to accomplish by removing the DSM fuse is just to pull power away from the module. If it is logic locked, this will potentially clear that and resume operation. When inspecting the module, check for partial, or otherwise poor connections. You can even disconnect and reconnect the connectors.

It is not necessarily safe to assume it is the seat module. You are getting to the point where a scan tool might be beneficial. If I could tell you which part to replace, that I would feel confident would fix it, I would. Do you have the capability of using a multi-meter or test light? Our next step would be to check power and ground to the memory seat module. If there is power and ground there, that is where the scan tool would be useful to determine first, that the module can communicate, and that it is receiving inputs from the switch. Power and ground comes to the drivers seat (memory) module. That connector C3, that I had mentioned earlier, houses those circuits. It is a 6 pin brown bodied connector. The power comes in on red/white wires, pins 5 and 6. The ground is black wire, pins 1 and 4. You can either use a meter, or a test light, from pins 5/6 to either pin 1 or pin 4. Depending on the method, you should see battery voltage (meter), or a light (test light). Another connector to check, disconnect and reconnect, is the large connector from the body harness to the seat harness, at the rear of the seat base. It is under a black plastic cover. When you disconnect these connectors, take a look at both sides for anything peculiar.

I have given about all I can think of, for basic checks and visual inspections. Like I had mentioned previously, it would be about time to incorporate a scan tool to verify communications to the memory seat module, as well as inputs/outputs. It could be the seat module, or wiring to it. If a scan tool can communicate with it, and it is receiving inputs, you have verified it had power and ground, it needs a module. The fact that the seat and pedal functions are inoperative, make it a common denominator, but it cannot be presumed the silver bullet.

I do not know as though that will work, the first thing to consider is will it communicate with the GMLAN high speed and low speed busses. This usually requires a scan tool that is CAN capable. Often times, those inexpensive scanners are just limited to power-train (emissions) related codes, and some data stream. How old is the unit? And have you used it on this vehicle?

Does it read any data? You need to be able to determine that the memory seat module is communicating, whether or not it has any codes stored, and also monitor the data stream to see if it is recognizing the inputs.

Typically, the modules seldom fail, now that does not assume that yours is not. Intermittent faults can usually fall into wiring problems that can be traced, or connection issues that may not be easily detectable. A faulty terminal in a connector can be difficult to find. Initially, what it requires is having a male terminal that matches the same classification as the female. With that male terminal, you can insert it in each female terminal and check that there is noticeable drag. A loose terminal fit can cause intermittent problems. What you want to try and to, is establish some specifics as far as symptoms, (i.E. Does the problem occur with someone in the seat or not, cold or warm (that could simply mean temperature of the passenger compartment as well), seat in a certain position, etc.). Check not only the connections that you already have, also the seat base to chassis harness connections at the rear floor.

Only that you can duplicate it. Several dynamics take place when someone it in the seat. It could be harness chaffing against a frame, module flexing, terminal contact. I would still check all possible connections, considering your vehicle has some years on it, anything is possible.