Where is the location of the cruise control module on a 1998 Audi cacbriolet

In the top of steering wheel an passenger side is in the dash panel . Should be marked air bag . Now if your looking for the SRS - air bag module , could be under the passenger seat or under the center console . Is the air bag light lit ? If so codes are stored .

check fuses and relays their are different locations for air bag sensors and their is also seat belt sensors and seat switches [check the connections under the seat ]---their are sensors under the front bumper behind the valance by the radiator support also if air bag curtains passenger side between inner fender, door and door pillar the following links have information or what to look for and assist in solving your problem the recall doesn't cover your vehicle but it pertained to the passenger air bag problem as well as the 05 posting
Why is my airbag light on 2005 Hyundai Elantra Air Bags Frontal Sensor Control Module Problems More than 280 000 Hyundai Elantras Recalled Over Air Bag Problems

1) Front End Sensor - Right--Located under the front hood in the engine compartment (2) I/P Air Bag--Located at the top right under the instrument panel (3) Roof Rail Air Bag - Right--Located under the headliner, extending from the passenger front windshield pillar to the passenger rear windshield pillar (4) Side Impact Sensor (SIS) - RF--Located under the right front door trim near the lower rear of the door frame (5) Sensing and Diagnostic Module (SDM)--Located underneath the vehicle carpet under the center console (6) Seat Belt Pretensioner - RF--Located under the trim near the bottom of the center pillar (7) Side Impact Sensor (SIS) - RR--Located under the right rear door trim near the lower rear of the door frame (8) Roof Rail Module - Right--Located behind the garnish molding on the upper rear pillar (9) Roof Rail Module - Left--Located behind garnish molding on the upper rear pillar (10) Side Impact Sensor (SIS) - LR--Located under the left rear door trim near the lower rear of the door frame (11) Seat Belt Pretensioner - LF--Located under the trim near the bottom of the center pillar (12) Side Impact Sensor (SIS) - LF--Located under the left front door trim near the lower rear of the door frame (13) Roof Rail Air Bag - Left--Located under the headliner, extending from the driver front windshield pillar to the driver rear windshield pillar (14) Steering Wheel Air Bag--Located on the steering wheel (15) Vehicle Battery--Located at the front left of the engine compartment. (16) Front End Sensor - Left--Located under the front hood in the engine compartment

The control module is behind the dash to the left of the radio. Remove the two screws underneath the radio, this will allow the dash panel to snap out. You can now see the module. Open the rear hatch, look to the left panel under side window, you will find the module behind it.

Modules are usually under the center console. Sensors are located in many different spots. Ones on the radiator core support, under the plastic piece. Ones under the front seats. Ones at the center column, just behind the front seats, and rollover sensors. I haven't found them yet.

there is a multi control module panel mounted under the rear seat they are located on the passenger side their are four or five module units mounted on the panel

The module that it is talking about is probably the air bag control module under the dash, not the airbag itself. These are known to go bad from time to time. These modules have thermal fuses inside them that can go bad. I'm not sure about the 98, but on the 92-95 models this module is behind the kick panel in the passenger side floorboard. I would start there. Once you locate the module, take it with you and head to your local salvage or junk yard. That will be the cheapest way to replace it.

Open the driver side door, Theres a fuse access there. Follow the Yellow-jacketed electrical line.

Please rate as fixya if this helps.
the air bag control module is under the console.

1. Disconnect the battery ground cable.
1. Wait one minute.
2. Remove the center console. For additional information, refer to Section 501-12 .

-----------------------------------------------------------------

1. Disconnect the battery ground cable.
2. Wait one minute.
3. NOTE: Contour shown, SVT similar.
   Remove the rear floor console screws.
1. Move seat fully forward.

1. Fully apply the parking brake.

1. Detach the shift indicator selector bezel.

1. Detach the shift bezel from the selector housing.
   1. Remove three bolts.
   1. Detach shift bezel from the console.

1. NOTE: The rear floor console must be raised to disengage the front retaining clips.
   Raise and remove the rear floor console.

1. Remove the four front floor console retaining screws.

1. Detach the front floor console.
   1. Set the gearshift lever into position 1.
      Partially remove the front floor console.

1. Disconnect the cigar lighter electrical connections and remove the front center console

-----------------------------------------------------------

1. Disconnect the air bag control module electrical connectors.
   1. Depress the locking tang.
   1. Slide the locking bar back.
   • Disconnect the connector.

1. NOTE: The air bag control control module is grounded by the retaining bolts.
   Remove the air bag control module.
   • Remove the three bolts.

--------------------------------------------------------------------------------------------
driver air bag module

1. Disconnect the battery cables.

1. Rotate the steering wheel 90 degrees to access and remove the Torx screw. Rotate the steering wheel 180 degrees to access and remove the Torx screws.

1. Remove the driver air bag module.
   • Disconnect the electrical connector.
   • Remove the air bag module.

------------------------------------------------------------------------------------------

1. Disconnect the battery cables. For additional information, refer to Section 414-01 .

1. Open the glove compartment, press the sides inward and lower the glove compartment to the floor.

1. Remove the passenger air vent duct.
   1. Disconnect the duct from the heater box housing.
   1. Disconnect the duct from the instrument panel register and remove.

1. Disconnect the passenger air bag module electrical connector.

1. Remove the two retaining bolts securing the rear of the passenger air bag module to the cross-vehicle beam.

1. CAUTION: Support the passenger air bag module when removing the retaining nuts.
   Remove the two nuts from the front of the passenger air bag module.

1. Remove the passenger air bag module.
   • Lower the front edge of the passenger air bag module, roll the passenger air bag module around the cross-vehicle beam lowering it into the passenger footwell.

the ECU is located on the passenger side floorboard underneath the consold and carpet