I have read a couple of thread on this subject and not sure where to start with mine. Both the Passenger and Drivers seatbelts are locked and won't retract. Door opened or closed, truck started or off. They won't move. I checked the fuse and it is good and confirmed continutiy and replaced just to make sure. Voltage is present at the fuse. I did a quick visual inspection and nothing disconnected. I did find a box that is about 2"X2" that has a plug connected to a wiring harness and the box was just lay is lose on the floor board under the center console seat. I assume this is the control module????? Also it was mentioned there is timer behind the dash? Is there both in a 99? I was going to do a closer inpection of the wires for shorts or open's. Any one know if this is modual trouble or timer trouble? Would anyone have a pin out or color code as to what does what. It appears the moduals are not longer available. If they aren't and I have to apply power from a switchd souce will they still work in an accident with out the modual or does the modual have to kill power based on accelrometer feed?

Thanks for the help.

 

Not thoughts? Called a local dealer and they are clues less unless i bring it in for 105 an hour.

 

Called another dealer today and they told me there is no control modual for the seat belt.

 

Check your fuses, I removed the fuse for my dome light and it did the same thing for my seat belts.

 

I checked the fuse on for the seatbelt and the dome light comes on in the truck but will go check that fuse as well as the rest to see if any are blown. Could have electical gremilins.

 

Are you sure that the harness under the seat is plugged in? They do what your talking about if you unplug it. Just something else to check.

 

I had my seats reupholstered and now my passenger seatbelt is locked? let me know what you find.

 

That is a dealer to put on your list to stay far away from !!!

The control module is located under the center seat on your 99

My book says it has a 13 pin plug
cav 7 is the left side seatbelt solenoid control circuit R7 18 OR/BK = wire color orange with black trace.

Cav 8 is the right side seatbelt solenoid circuit R18 OR/RD = orange with red trace

Pin 6 = ground Bk/lg
pin 5 = fused batt + pink
pin 4 DB fused ignition switch output (run-acc)
pin 2 left door ajar switch sense TN
pin 3 right door ajar switch sense TN/RD trace

11 is the seat belt control timer module sense LG/BK trace

13 is another ground BK/PK
1,9,10,12 are not used

 

Weather work and a cold prevented me from working on it this weekend and out of town next weekend. Thanks for the inof rattler that should help me alot in tracing down the problem. I didn't see any other connectors on this box i found laying on the floor board and thr connector that was in it looked secure. As soon as I can I will pull it and check in voltages and post my findings.

In the event the module is bad and for some reason I can't find a replacement can I rewire to get them volatage and will they still lock if needed or does this modula the only way to get them to engage when needed?

 

SEAT BELT CONTROL TIMER MODULE

DESCRIPTION
The Seat Belt Control Timer Module (SCTM) is secured to a bracket underneath the front edge of the front seat center cushion. The SCTM mounting bracket also serves as the support for the slide-out seat cup holder unit. The SCTM controls the supply of battery current to both of the front seat belt retractor latch solenoids. The SCTM contains an electromechanical Gravity (G)-sensor and an electronic timer circuit. The SCTM monitors the ignition switch state and both door jamb switches through hard-wired inputs. In response to those inputs, the SCTM controls hard-wired outputs to both seat belt retractor latch solenoids. The SCTM also sends diagnostic outputs to the Airbag Control Module (ACM) over a hard-wired fault circuit.

For diagnosis of the CCD data bus, the ACM or the fault circuit input to the ACM from the SCTM, the use of a DRB scan tool and the proper Diagnostic Procedures are recommended. The SCTM cannot be repaired. If faulty or damaged, it must be replaced.

OPERATION
The SCTM provides battery current to energize the seat belt retractor latch solenoids whenever the ignition switch is in the ON or ACCESSORY position, unless the G-sensor input indicates a vehicle condition that requires the set belt retractor to be latched. When the seat belt retractor latch solenoids are energized the retractor spools are unlatched, and the seat belt webbing can be extracted from the retractor. When the solenoids are deenergized the retractor spools latch, preventing the seat belt webbing from being extracted further from the retractor. This logic ensures that the seat belts will latch and/or remain latched if battery power is lost during a vehicle collision.

The electromechanical G-sensor within the SCTM monitors the rate of vehicle acceleration and de-acceleration in any horizontal direction. The G-sensor also responds to the horizontal attitude of the vehicle, If the G-sensor monitors a gravity force of greater than about 0.7G in any horizontal direction, or the vehicle is tilted in any direction at an angle of greater than about 45 degrees , the SCTM will de-energize (lock) the seat belt retractor latch solenoids.

The SCTM electronic timer circuit provides the vehicle occupants with the ability to extract the seat belt webbing from the retractor spool for a time period of about 30 minutes after the ignition switch is turned to the Off position. The electronic timer circuit also monitors the state of the door jamb switches, and unlatches the seat belt retractors after either door jamb switch cycles from open to closed or from closed to open. Each time the SCTM receives and input indicating a change in the state of a monitored switch, the 30 minute unlatch timer starts again. The timer also is used to de-energize the retractor latch solenoids after about 30 minutes , and prevent the battery from being drained while the vehicle is not being driven.

The hard wired SCTM output to the ACM is used to indicate whether a fault condition is present in the structural seat belt control system. The ACM monitors the input from the SCTM and sends the proper messages to the instrument cluster on the Chrysler Collision Detection (CCD) data bus to turn the seat belt reminder lamp ON or OFF. If the ACM receives a fault input or does not detect any input from the SCTM, it sets a fault code and sends messages to the instrument cluster to turn the lamp on.

 

Great informationt thanks. If i hard wire i would be just as safe as no seat belt. Also the fact that mine isn't mounted may have something to do with it. Thanks for the help on this I appreaciate everyone's assistance. i will post back what I find when I get to it next weekend.

 

Weather just isn't cooperating. For any one following I hope to have some information soon.

 

Do the '01s have the same kind of module? I don't see anything listed in the FSM about a Seat Belt Control Timer Module. Also, the seat belt retractors do not show to have any electrical solenoids attached to them (based on the info in the FSM).

EDIT: Found another post from TDR that stated the '99s were the last year to use the electric solenoids on the seats, the models after that went with a standard ratcheting locking mechanism. Just figured I'd update this in case anyone else runs across it

 

Thanks for the info. If i can't fix it guess i will look for new seats.

 

The good new it wasn't a bad modual or wiring problem. Bad new is the modual is hanging lose and was up side down and triping the accelarometer. Turned it over and seat belts work. Tested engagement by moving the modual and the lock like they are supposed to. Now does anyone know where I mount it back to? I can't see any extra holes on the seat frame and no holes in the floor liner. If someone has a picture that would help?

I did take some picuture of the connectors and was going to test voletages until I found the moduals was just upside down.