1998 Oldsmobile Bravada - Answered Questions & Fixed issues

check fuses. scan the PCM yet? 1998 4wd is computer controlled NP-136 transfer case, which works more like traction control. The Bravada was now run in RWD in normal operations, and only when wheel slip was detected did the SmartTrak engage AWD The NP136 transfer cases was manufactured with electrical shift encoder motors, this unit has two different drive ranges 2 high and 4WD (run at reduced speeds) with the front output drop on the driver side. This unit has a 27 spline front output and utilizes a rear slip yoke. if you have purchased your car used the very first order of business is to double check the tire diameters. Used car dealers may have mismatched size the tires to make the sale. Mismatched tires will cause the NP136 transfer case to fail.The NP136 transfer case unit has a couple of problems, it utilizes a viscous coupler clutch system that can fail. One way to recognize this failure mode is clicking sounds when turning on dry asphalt or concrete surfaces. Viscous coupler failure is attributed to excessive heat build up. The second problem is that the oil circulation pump on NP136 can wear a hole in the case, we provide a transfer case saver to prevent this from happening. Once you have a hole in the case fluid will be lost and the case will fail. Don't leave home without our case saver, it's only a matter of time. Recommended fluid for the NP 136 transfer case is GM part number 12378396. and more get the car serviced, or learn to scan first. and post DTC seen

I have that same problem you have to get in the steering column and right under the key. If you don't want to open it it's a little slot when you pop off stick something like a pencil a sword in there and as you're pushing it, you have to turn the key, I have a 98 divided two do you know the speaker wiring colors anybody on a 98 Oldsmobile bravada

The security module may have failed - I'm afraid your only recourse will be to take it to a dealer.

servicing the fuel system comes to my mind

starts and shuts right off - anti-theft system problem not fuel pump.

If the smarttrack light is on, trouble codes are stored. That's your starting point.

somethings hooked up wrong

Have you checked for injector pulse and fault codes? Do so.

It's a lot of work just to get at the diverter doors/actuators on the HVAC plenum under the dash, as they are near the center of the vehicle. Check YouTube to see a typical view (e.g. for a Blazer or Jimmy)..

No vacuum lines ,vent tubes . Which transfer case ? Transfer Case - NVG 233-NP1 (Two Speed Selectable) Transfer Case - NVG 136-NP4(One Speed Automatic) Encoder Motor not decoder motor ,an why did you replace it two times ? open for suggestions ,yea take it to a qualified repair shop. Do you know what DTC'S - diagnostic trouble codes are ? DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0550 ECU Malfunction DTC C0611 VIN Information Error DTC C0895 Device Voltage Malfunction

Olds what model please. Thanks

No 4X4 switch on the instrument panel ? Automatic Transfer Case The single speed automatic transfer case system shifts automatically from rear wheel drive to four wheel drive when the transfer case shift control module (TCSCM) senses the difference in rotation speed of the front propeller shaft and the rear propeller shaft . Two vehicle speed sensors, one located at the rear output shaft area of the transfer case, and the other, located at the front output shaft area of the transfer case, send front and rear propeller shaft rotation speed information to the TCSCM. When the front and rear output shaft rotations remain the same, the TCSCM sends pulse width modulation signals to the encoder/motor to keep the transfer case in rear wheel drive. When the front and rear output shafts rotations are different, the shift control module sends pulse width modulation signals to the encoder/motor to engage the transfer case into four wheel drive. The system will automatically transfer a percentage of torque to either the front or rear axles as required to stop all wheel slip. When the front and rear output shafts rotations return to the same speed rotation, the shift control module sends pulse width modulation signals to the encoder/motor to position the transfer case back into rear wheel drive. When the transfer case is engaged into four wheel drive, a lamp indicator on the instrument cluster will light. The automatic transfer case system is completely automated, no transfer case control button switching system is required. Do you know what DTC'S - diagnostic trouble code's are ? Auto part stores can't read these , your best bet take it to a qualified repair shop . One that has the knowledge an diagnostic equipment . DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0550 ECU Malfunction DTC C0611 VIN Information Error DTC C0895 Device Voltage Malfunction Without proper factory service an repair info. an diagnostic tools

go to then given link and get the solution http://toolsnyou.com/

Possibly the engine computer. Have checked out by mechanic. If you need an Enginecomputer call Cam auto computers 866-256-2726. They are good

AC not working?

on a hot day it will blow warm/hot air if the AC is turned off or not working

If its hot air and AC is working then i would start by checking the fuse or relay. if its not the fuse/relay then i would look into the heater box there is a door that blocks the hot air

On this website you find fuse box diagram and description for Oldsmobile Bravada (1998) Oldsmobile Bravada 1998 fuse box diagram Auto Genius

If there is an underbody shield package, you will have to remove it.

Disconnect battery ? Hoping for a magical fix ? Battery light on means there is a charging system problem , alternator not the battery . Do you know how to do automotive electrical circuit testing ? If not your best bet , take it to a qualified repair shop . How To Check Charging System EricTheCarGuy Some of the problems are likely do to a low voltage condition . It would also have the vehicle control modules checked for DTC'S - diagnostic trouble codes ! Doing electrical testing of the circuits of the thing's not working etc... is the way to find the problem . Electric Testing Techniques You Need to Know It takes years to learn how to do electrical test correctly . Someone who has no clue shouldn't even try .

Where do you have the switch off or auto ? Turn them off ! 2 Use the scan tool in order to read the body control module (BCM) current trouble codes. Is DTC B2575, B2577, or B2600 set as a current code? -- Go to Diagnostic System Check - Body Control System in Body Control System Go to Step 3 3 Remove the DRL relay from the underhood bussed electrical center (UBEC). Do the daytime running lamps remain ON?? -- Go to Step 4 Go to Step 5 Check the headlamp power relay in the underhood fuse / relay box !

Does it have spark , fuel pressure ? If the starter spins the engine an does not start an run , you have a fuel delivery problem or a ignition system problem . There are videos on youtube showing how to test for these .