Recently purchased a 99 grand am gt that had a missing air bag. I purchased one and installed it into the passenger compartment with the battery disconnected. The car has been hit in the front but I can't find any impact sensors. Will the air bag deploy when I hook the battery back up? and are there sensors that I need to replace?

First, you will have to remove the Airbag fuse or disconnect the battery.
2- Gain access to the passenger air bag's connector by removing the glove compartment.
3- You should see the yellow connector.
4- Unlock the connector (green lock) and unplug the connector

Hope it helps.

On my 99 I have a key hole to turn mine on and off. I would check around the lighter or glove compartment for something similar.

Hi, this problem is caused by failure of the blend door actuator or structural failure of the door itself. First, access the actuator as instructed below. Have someone turn the key on and change the temperature setting while you watch the actuator. If the actuator turns, odds are the door hinge has failed. In this case, the heater box must be removed from the truck and split open to repair the door.
If the actuator does not move, it may have failed. Remove the actuator and check it for stripped gears or plug it back in and see if it will turn at all when the temperature control is changed. You might also want to check for voltage at the connector before buying a new actuator. A new actuator is about $40.

1. Disarm the air bag system as explained below.
2. Open the glove compartment to access the passenger air bag module bolts.
   
   

   Fig. Passenger air bag module view
   

3. Disconnect the passenger air bag module electrical connector
4. Remove the two passenger air bag retaining bolts.
5. Disconnect the passenger air bag module electrical connector.
6. Placing one hand in the glove compartment, push the passenger air bag module out and remove it.
   WARNING Do not handle the passenger air bag module by grabbing the edges of the deployment doors.
7. Remove the defroster opening grill.
   
   

1. Fig. Defroster grill view

2. 
   
   

3. Detach and position the RH demister hose aside.
4. On vehicles with anti-theft/keyless entry, remove the screws and position the anti-theft/keyless entry module aside.
5. Working through the opening near the RH defroster nozzle, remove the screw.
6. Disconnect the electrical connector.
7. Remove the screws and the temperature blend door actuator.
8. To install, reverse the removal procedure. Tighten the air bag module bolts to 71 inch lbs. (8 Nm).
   
   

Fig. Temperature blend door actuator view

Disarming the Airbag System

1. Turn all vehicle accessories OFF.
2. Turn the ignition switch to OFF.
3. At the smart junction box (SJB), located below the RH side of the instrument panel, remove the RH lower cowl trim panel and remove the restraints control module (RCM) fuse from the SJB. For additional information, refer to the Owner-s Manual.
4. Turn the ignition ON and visually monitor the air bag indicator for at least 30 seconds. The air bag indicator will remain lit continuously (no flashing) if the correct RCM fuse has been removed. If the air bag indicator does not remain lit continuously, remove the correct RCM fuse before proceeding.
5. Turn the ignition OFF.
   CAUTION To avoid accidental deployment and possible personal injury, the backup power supply must be depleted before repairing or replacing any front or side air bag supplemental restraint system (SRS) components and before servicing, replacing, adjusting or striking components near the front or side air bag sensors or RCM, such as doors, instrument panel, console, door latches, strikers, seats and hood latches.
   
6. To deplete the backup power supply energy, disconnect the battery ground cable and wait at least one minute. Be sure to disconnect auxiliary batteries and power supplies (if equipped).
7. Disconnect the battery ground cable (14301) and wait at least one minute.

What i have is the steps on how to put or replace the heater core. hope this will help you.

the core is located behind the steering column, meaning you mainly need to remove that. On more recent cars, the whole dashboard needs removal.

Older Models

Shut off power to the Maxima, especially the air bag system. Disconnect the negative battery terminal and wait at least 3 minutes for the air bag to lose energy.

rain the engine coolant from the cooling system. Use a clean container if you plan on reusing the coolant.

Disconnect the heater hoses from the heater unit inside the engine compartment. Remove the blower and cooling unit from the interior and then the steering member assembly. Remove the heater unit and the core from the unit.

Install the new core into the heater unit and reconnect the unit in the car. Connect the steering member, cooling unit and heater hoses.Refill the cooling system and connect the battery cable.

Newer Models

Unplug the negative battery terminal. Wait 3 minutes for the air bag system to lose power. Drain the engine coolant into a clean container.

Disengage the air bags from both sides of the car. Remove driver's bag by removing the steering wheel's lower and side lids and the Torx bolts from the wheel sides. Disconnect the passenger bag electrical connector from inside the glove box.

Disassemble the instrument panel. Remove all components and screws from the panel, then have an assistant help lift and remove the panel itself.

Disconnect the following heater, defroster and ventilation ducts on the rear and sides. Remove the heater housing and the heater core from the housing.

Reinstall the heater housing with the new core installed. Replace all ducts, the instrument panel and the air bags.

fill the cooling system and reconnect the battery cable. Let the Maxima

Look at fig. 4 for the heater a/c dash control: HEATER CORE Altima REMOVAL AND INSTALLATION

1. Position the steering wheel in the straight-ahead position.
2. Turn the ignition switch OFF.
3. Disconnect the negative (() battery cable; then, the positive (+) battery cable. NOTE: Wait for a least 3 minutes after disconnecting the battery cables for the charge in the air bag circuit to dissipate before working on the air bag module(s).
   
4. Remove the driver's side SRS and steering wheel by removing or disconnecting the following:
   • Lower lid from the steering wheel and disconnect the driver's air bag module connector
   • Left and right side lids from the steering wheel
   • Special bolts from both side of the steering wheel using a tamper resistant Torx wrench (T50)
   • Air bag module and store it face up
   • Horn's electrical connector and remove the steering wheel nut
   • Steering wheel from the steering column using a suitable puller
5. Remove the passenger's side SRS by removing or disconnecting the following:
   • Glove box door and the glove box
   • Front passenger's air bag module connector
   • 2 special bolts using a tamper resistant Torx wrench (T50)
   • 4 passenger's air bag-to-instrument panel nuts
   • Front passenger's air bag module and store it face up.
6. Drain the cooling system into a clean container for reuse.
7. Discharge and recover the air conditioning system refrigerant.
8. Working in the engine compartment, disconnect the heater hoses from the heater core tubes.
9. Remove the instrument panel by removing or disconnecting the following:
   • Kick plate and dash side finisher on the driver's side
   • 2 lower panel-to-instrument panel screws and the lower panel on the driver's side
   • 2 lower reinforcement panel-to-instrument panel screws and the lower reinforcement panel
   • 6 steering column cover screws, the covers, the spiral cable and combination switch
   • 2 cluster lid "A" screws and the cluster lid "A"
   • 3 combination meter screws, disconnect the electrical harness connector and remove the combination meter
   • Switch panel
   • Instrument panel lower covers
   • Snap out the transmission shifter finisher (boot)
   • 4 cluster lid "C" screws and the cluster lid "C"
   • 4 audio and deck pocket-to-instrument panel screws and the audio and deck pocket
   • 5 center console screws and the center console
   • 2 center instrument panel screws and the center panel
   • front defroster grilles
   • Front pillar garnish
   • Instrument panel 3 nuts/4 screws and the instrument panel
   • 8 instrument stay assembly nuts and the stay
   • Steering member assembly 5 nuts/1 bolt and the steering member
10. Remove the air conditioning housing assembly by removing or disconnecting the following:
    • Refrigerant lines from the air conditioning housing assembly
    • Thermo control amp
    • Air conditioning housing assembly
11. Remove or disconnect the following:
    • Heater unit
    • Heater core from the heater unit Fig. 1: Exploded view of the steering wheel and air bag module
      Fig. 2: Exploded view of the passenger's side air bag module
      Fig. 3: Exploded view of the instrument panel assembly
      Fig. 4: Exploded view of the heater housing assembly and related components
      Fig. 5: View of the heater core and heater housing
      
    To install:
    
12. Install or connect the following:
    • Heater core to the heater unit
    • Heater unit
13. Install the air conditioning housing assembly by installing or connecting the following:
    • Air conditioning housing assembly
    • Thermo control amp
    • Refrigerant lines to the air conditioning housing assembly
14. Install the instrument panel by installing or connecting the following:
    • Steering member assembly and the steering member 5 nuts/1 bolt
    • Instrument stay assembly and the 8 stay nuts
    • Instrument panel and the instrument panel 3 nuts/4 screws
    • Front pillar garnish
    • Front defroster grilles
    • Center instrument panel and the 2 center panel screws
    • Center console and the 5 center console screws
    • Audio and deck pocket and the 4 audio and deck pocket-to-instrument panel screws
    • Cluster lid "C" and the 4 cluster lid "C" screws
    • Snap in the transmission shifter finisher (boot)
    • Instrument panel lower covers
    • Switch panel
    • Combination meter, connect the electrical harness connector and install the 3 combination meter screws
    • Cluster lid "A" and the 2 cluster lid "A" screw
    • Combination switch, the spiral cable, the covers and the 6 steering column cover screws
    • Lower reinforcement panel and the 2 lower reinforcement panel-to-instrument panel screws
    • Lower panel and the 2 lower panel-to-instrument panel screws, on the driver's side
    • Kick plate and dash side finisher, on the driver's side
15. Working in the engine compartment, connect the heater hoses to the heater core tubes.
16. Install the passenger's side SRS by installing or connecting the following:
    • Front passenger's air bag module
    • 4 passenger's air bag-to-instrument panel nuts
    • 2 new special bolts and torque using a tamper resistant Torx wrench (T50) to 11-18 ft. lbs. (15-25 Nm)
    • Front passenger's air bag module connector
    • Glove box door and the glove box
17. Install the driver's side SRS and steering wheel by installing or connecting the following:
    • Steering wheel to the steering column
    • Steering wheel nut and torque the nut to 22-29 ft. lbs.
    • Horn's electrical connector
    • Air bag module
    • New special bolts to both sides of the steering wheel and torque the bolts using a tamper resistant Torx wrench (T50) to 11-18 ft. lbs. (15-25 Nm).
    • Both the left and right side lids to the steering wheel
    • Lower lid to the steering wheel and connect the driver's air bag module connector
18. Refill the cooling system.
19. Connect the positive (+) battery cable; then, the negative (() battery cable.
20. Evacuate, charge and leak test the air conditioning system refrigerant.
21. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Disconnect the Battery and wait at least 2-mins (to prevent a accidental discharge of the Passenger side Air Bag).
Remove the Dash-Glove Box. The Resistor is located directly behind the Glove Box on the fire wall, and is held on with two (2) 8mm screws.
Unplug the Resistor, remove the screws and it pulls-out.
Install the new Resistor, install the screws, plug back in, reconnect the Battery and recheck the Blower Speed operation. Re-disconnect the Battery and wait = (Air Bag!) and reinstall the Glove Box.

Let me know if this helped, or if you have additional information or questions. Feel Free to contact us at FixYa.com!

Cherokee, Grand Cherokee, 1999-2005

Removal & Installation

1. Disconnect and remove the negative battery.
   CAUTION After disconnecting the negative battery cable, wait 2 minutes for the driver-s/passenger-s air bag system capacitor to discharge before attempting to do any work around the steering column or instrument.
2. Drain the cooling system into a clean container for reuse.
3. Remove the instrument panel by performing the following procedure:
   1. Turn the steering wheel in the straight-ahead position.
   2. Remove the knee blocker from the instrument panel.
   3. Remove the steering column; do not remove the air bag module, the steering wheel or switches from the steering column.
   4. From under the driver-s side of the instrument panel, disconnect the following items:
      
      Instrument panel wiring harness connector from the 100-way wiring harness connector at the left side of the inner panel. Side window demister hose at the heater/air conditioning housing demister/defroster duct on the driver-s side.
   5. Remove the glove box.
   6. Reaching through the glove box opening, disconnect the following items:
      
      Two halves of the heater/air conditioning system vacuum harness connector. Instrument panel wiring harness connector from the heater/air conditioning system wiring harness connector. Instrument panel wiring harness connector from the passenger-s side air bag module wiring harness connector. Side window demister hose at the heater/air conditioning housing demister/defroster duct (passenger-s side). Two halves of the radio antenna coaxial cable connector. Two instrument panel wiring harness connectors from the passenger air bag ON/OFF switch wiring harness connector. Passenger-s side air bag ON/OFF switch wiring harness from the retainer clip on the plenum bracket that supports the heater/air conditioning housing just inboard of the fuse block module. Two lower passenger-s side air bag module bracket-to-dash panel nuts.
   7. Remove the upper cover from the instrument panel.
   8. Remove the 3 instrument panel-to-door hinge pillar screws.
   9. Remove the 4 upper instrument panel-to-dash nuts.
   10. Using an assistant, remove the instrument panel from the vehicle.
       
4. If equipped with air conditioning, discharge and recover the air conditioning system refrigerant.
5. Disconnect the refrigerant lines from the evaporator. Plug the refrigerant openings to prevent evaporation.
6. Disconnect the heater hoses from the heater core tubes.
7. Disconnect the heater/air conditioning system vacuum supply line connector from the T-fitting near the heater core tubes.
8. In the engine compartment, remove the 5 heater/air conditioning housing-to-chassis nuts. If necessary, loosen the battery hold-downs and reposition the battery for access.
9. Remove the cowl plenum drain tube from the heater/air conditioning housing stud; it-s located behind the cylinder head on the cowl.
10. From the bottom of the heater/air conditioning housing, remove the floor duct.
11. On the passenger side, remove the heater/air conditioning housing-to-plenum bracket screw.
12. Pull the heater/air conditioning housing down far enough to clear the defrost/demist and fresh air ducts, then, rearward far enough to clear the mounting studs and the evaporator drain tube to clear the dash panel holes.
13. Remove the heater/air conditioning housing assembly from the vehicle.
14. Remove the heater/air conditioning housing upper case.
15. Lift the heater core from the lower half of the heater/air conditioning housing.
    

To install:

1. Assemble the heater core into the lower half of the heater/air conditioning housing.
2. Install the heater/air conditioning housing upper case.
3. Install the heater/air conditioning housing assembly to the vehicle.
4. On the passenger-s side, install the heater/air conditioning housing-to-plenum bracket screw.
5. At the bottom of the heater/air conditioning housing, install the floor duct.
6. Install the cowl plenum drain tube to the heater/air conditioning housing stud; it-s located behind the cylinder head on the cowl.
7. In the engine compartment, install the 5 heater/air conditioning housing-to-chassis nuts.
8. Connect the heater/air conditioning system vacuum supply line connector to the T-fitting near the heater core tubes.
9. Connect the heater hoses to the heater core tubes.
10. Connect the refrigerant lines to the evaporator.
11. If equipped with air conditioning, evacuate and charge the air conditioning system refrigerant.
12. Install the instrument panel by performing the following procedure:
    1. Using an assistant, install the instrument panel to the vehicle.
    2. Install the 4 upper instrument panel-to-dash nuts.
    3. Install the 3 instrument panel-to-door hinge pillar screws.
    4. Install the upper cover to the instrument panel.
    5. Reaching through the glove box opening, connect the following items.
       
       Two lower passenger-s side air bag module bracket-to-dash panel nuts. Passenger-s side air bag ON/OFF switch wiring harness to the retainer clip on the plenum bracket that supports the heater/air conditioning housing just inboard of the fuse block module. Two instrument panel wiring harness connectors to the passenger air bag ON/OFF switch wiring harness connector. Two halves of the radio antenna coaxial cable connector. Side window demister hose at the heater/air conditioning housing demister/defroster duct (passenger-s side). Instrument panel wiring harness connector to the passenger-s side air bag module wiring harness connector. Instrument panel wiring harness connector to the heater/air conditioning system wiring harness connector. Two halves of the heater/air conditioning system vacuum harness connector.
    6. Install the glove box.
    7. Under the driver-s side of the instrument panel, connect the following items:
       
       Side window demister hose at the heater/air conditioning housing demister/defroster duct on the driver-s side. Instrument panel wiring harness connector to the 100-way wiring harness connector at the left side of the inner panel.
    8. Install the steering column.
    9. Install the knee blocker to the instrument panel.
    
    
13. Connect and remove the negative battery.
14. Refill the cooling system.
15. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Hope helps (remember rated this).

you need to check the power brake booster canister it sounds like it is leaking vacume past the seals

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.

sounds like security system problem...to re-set, put key in ignition, turn to run, till security light stops flashing. turn off then start car. See if this helps!