20 Most Recent
Questions & Answers
AWD not working
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
on Jan 08, 2018
The heater blows hot air
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 Jul 28, 2017
Do you have a 4WD Bravada? Or an AWD? If it is AWD, there is no shifting. It is in 4WD Drive all the time.
Do you have something on the dash that allows you to change from 2WD to 4WD HI/Lo? Is so, then check your fuses in the fuse box. You may just have a blown fuse.
on Jul 28, 2017
1998 Olds Bravada 4.3 liter engine. Electrical
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 .
on Jun 12, 2017
1998 Oldsmobile Bravada low beams always on
Where do you have the switch off or auto ? Turn them off !
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
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 !
on May 27, 2017
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