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Home >> Freightliner Truck >> 2006 >> Sprinter 3500 L5-2.7L DSL Turbo >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Restraints and Safety Systems >> Air Bag Control Module >> Service and Repair

Air Bag Control Module: Service and Repair

WARNING:
- TO AVOID PERSONAL INJURY OR DEATH, ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, AIRBAG, SEAT BELT TENSIONER, IMPACT SENSOR, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT.
- TO AVOID PERSONAL INJURY OR DEATH, NEVER STRIKE OR DROP THE AIRBAG CONTROL MODULE AS IT CAN DAMAGE THE IMPACT SENSOR OR AFFECT ITS CALIBRATION. THE AIRBAG CONTROL MODULE CONTAINS THE IMPACT SENSOR, WHICH ENABLES THE SYSTEM TO DEPLOY THE SUPPLEMENTAL RESTRAINTS. IF AN AIRBAG CONTROL MODULE IS ACCIDENTALLY DROPPED DURING SERVICE, THE MODULE MUST BE SCRAPPED AND REPLACED WITH A NEW UNIT. FAILURE TO OBSERVE THIS WARNING COULD RESULT IN ACCIDENTAL, INCOMPLETE, OR IMPROPER SUPPLEMENTAL RESTRAINT DEPLOYMENT.

REMOVAL
1. Disconnect and isolate the battery negative cable. Wait two minutes for the system capacitor to discharge before further service.

Airbag Control Module Location:




2. Move the driver side front seat to its most forward position for easiest access to the seat riser cover panel.

Seat Riser Cover:




3. Remove the two screws that secure the cover panel to the top of the seat riser under the driver side front seat.
4. Remove the cover panel from the top of the driver side seat riser.

Control Module Bracket:




5. Remove the two screws that secure the control module bracket to the top of the seat riser under the driver side front seat.
6. Remove the control module bracket from the top of the driver side seat riser.

ACM Cover:




7. Locate the Airbag Control Module (ACM) in the right rear corner of the area within the driver side seat riser. Firmly grasp and pull upward on the molded plastic cover to unsnap it from over the ACM.

Airbag Control Module Remove/Install:




8. Remove the three screws that secure the ACM to the bracket that is welded onto the floor panel under the driver side front seat.
9. Lift the ACM upward far enough to access the ACM wiring connection. Depress the release and lift the lever arm to disconnect the vehicle wire harness connector for the ACM from the ACM connector receptacle located on the left facing side of the module.
10. Remove the ACM from within the driver side front seat riser.

INSTALLATION
1. Reconnect and latch the vehicle wire harness connector for the ACM to the ACM connector receptacle located on the left facing side of the module.

ACM Cover Base Plate:




2. Carefully position the ACM cover base plate onto the mounting bracket that is welded onto the floor panel under the driver side front seat.
3. Carefully position the ACM onto the ACM cover base plate. When the ACM is correctly positioned, the three ACM mounting tabs will be aligned with the holes in the cover base plate and the mounting bracket, and the orientation arrow on the ACM label will be pointed forward in the vehicle.
4. Install and tighten the three screws that secure the ACM to the mounting bracket that is welded onto the floor panel within the driver side front seat riser. Be certain that the ground eyelet terminal is installed under the screw for the left rear mounting tab. Tighten the screws to 12 Nm (105 in. lbs.).
5. Position the ACM cover over the ACM and press it down firmly and evenly until it snaps into position over the ACM cover base plate.
6. Position the control module bracket onto the top of the driver side seat riser.
7. Install and tighten the two screws that secure the control module bracket to the top of the seat riser under the driver side front seat. Tighten the screws to 2 Nm (18 in. lbs.).
8. Position the cover panel onto the top of the driver side seat riser.
9. Install and tighten the two screws that secure the cover panel to the top of the seat riser under the driver side front seat. Tighten the screws to 2 Nm (18 in. lbs.).
10. Move the driver side front seat back to its driving position.
11. Do not reconnect the battery negative cable at this time. The supplemental restraint system verification test procedure should be performed following service of any supplemental restraint system component.

NOTE: If the Airbag Control Module (ACM) has been replaced with a new unit, it will be necessary to initialize the new ACM. In order to function properly, the ACM must be programmed for the correct standard and optional supplemental restraint system components installed in the vehicle. To initialize the ACM, a DRBIII(R) scan tool is required. Refer to the appropriate diagnostic information.
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