Water in floor of car

Module is 300.00-600.00 depending where you buy it, plus an hour labour to install and program. Which side of the vehicle is getting wet? This may not be the BCM but could be this problem:
Hard/No Start, Fuel Gauge Inoperative/Fluctuates, SES/Check Engine Light On, ABS Warning Light On, TCS Warning Light On, TCS Activation, Service Traction System Message Displayed, All-Wheel Drive Disable Message Displayed, DTCs Set (Repair Connector) TECHNICAL SERVICE BULLETIN Reference Number(s): 01-08-45-005E,  Date of Issue:  August 29, 2006 Related Ref Number(s): 01-08-45-005, 01-08-45-005A, 01-08-45-005B, 01-08-45-005C, 01-08-45- 005D, 01-08-45-005E ARTICLE BEGINNING CONDITION Some customers may comment on one or more of the following conditions: à   Engine is hard to start à   Engine will not start à   Engine starts then stalls à   Fuel gauge is inoperative or fluctuates à   Service Engine Soon/Check Engine light is illuminated à   ABS Warning Light is illuminated à   TCS Warning Light is illuminated à   TCS activation à   Service Traction System message displayed à   All-Wheel Drive Disable message displayed These conditions may be intermittent. Upon investigation, the technician may find various DTCs set. CAUSE This condition may be due to water leaking into the interior of the vehicle, and/or spread terminals, at connector C305 that is located on the floor to the rear of the driver's seat. This connector is not sealed from the inside of the vehicle and water may enter the connector causing the terminals to become corroded. Also, the female terminals of the connector may have become spread apart causing an intermittent poor connection. CORRECTION Affected Model(s): 2002-2006 Buick Rendezvous; 2005-2007 Buick Terraza; 2000-2005 Chevrolet Venture; 2005-2007 Chevrolet Uplander; 2000-2004 Oldsmobile Silhouette; 2000- 2005 Pontiac Montana; 2001-2005 Pontiac Aztek; 2005-2007 Pontiac Montana SV6; 2005-2007 Saturn Relay Supercedes: This bulletin is being revised to add 2007 model year. Also, additional information was added to the Important statement. Please discard Corporate Bulletin Number 01- 08-45-005D (Section 8 - Body and Accessories). Corroded and/or spread female terminals in connector C305. Refer to Repairing
Terminals in the Wiring Systems sub-section of the appropriate service information. WARRANTY INFORMATION
repaired under warranty, use: IMPORTANT: Ã Â Â Inspect the terminals at connector C305 for corrosion or spreading before replacing the fuel module or resistor card kit. Terminals can be accessed from underneath the vehicle. Ã Â Â Do not attempt to repair any spread female terminals as this will result in a return repair. The female terminal must be replaced. Ã Â Â If the terminals show signs of corrosion, determine the source of the water leak first and repair the water leak before repairing the terminals in connector C305. Refer to Corporate Service Bulletin Number 01-01-38-009A to determine a potential source for water in the vehicle interior. This affected 02-06's

Grangyoung, have you had it scanned for both soft and hard codes to see what is causing the CEL?

Check for missing grommets or plugs in the bulkhead between the passenger and engine compartments. Next, check for missing grommets under the plastic trim panels down by the feet, both in the sides of the body and the floor.

Knowing the codes might help give you an idea as to where the leak is.

There is a drain tube for the AC should be on passenger side of the firewall. Down by floor . Clean it out you should water come out with AC on.

The tube that lets the condensation out is clogged. When our ac is on for a while, and you park the car, do u get a puddle of water under the car? If not, bring it to a garage, and have them clean out your drain tube for your condensation from the ac. Black hose located on the firewalll.

Take a garden hose and spray it at the windshield you will be able to see the water leak which will probably need to reseal the entire windshield which means replacement. Here is how you remove the wiper arms.

Pull upward on the arm while tapping on the pivot shaft.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers

They are missing something. There is nothing else that would cause it to get wet. Tell me, is it water or coolant on the floor?

There is a collection tray for the water to enter and then drained. It must be cracked.

This has nothing to do with when it rains, does it?

If the water was that high, you have a lot of work ahead of you. You are going to have to take every connector apart and blow all the water out and grease the connector. The module are most likely finished but dry everything out with a hair drier. Change the oil and fluids. It will take you a while but it could run by the time you are done.

There is a bulliten out on the a/c drain, but the passenger side floor will be wet? Here's the bulliten:

The drain tube comes out of the firewall on the passenger side or the center section. You can use a coat hanger or other type of wire to run through the drain tube. There should be a 90 degree elbow on the drain tube that faces down. Be sure to put it back on.