Did you ever think of having it diagnosed by a qualified repair shop ? Thier are aspects associated with this system you have no clue about. That's the first thing every one goes for , changing the switch . It flashes because codes are stored .
DTC B0768 Service Indicator Circuit High
DTC B2725 ATC Mode Switch Circuit Malfunction
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 C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0357 Park Switch Circuit High
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error
You need a professional scan tool to check for these codes an too view data parameters .
Transfer Case Shift Control Module
The transfer case shift control module uses the VIN information for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine. The system does not know which calibration to use without this information.
The direct battery supply line (CKT 1640) provides the power to the module and motor circuitry.
Transfer Case Encoder Motor
The transfer case encoder motor consists of a permanent magnet (PM) DC motor and gear reduction assembly. It is located on the left hand side (drivers side) of the transfer case. When activated it turns the sector shaft of the transfer case (clockwise or counter clockwise) to shift the transfer case. The encoder motor is controlled with a pulse width modulated (PWM) circuit within the transfer case shift control module. This circuit consists of a driver on both the Motor A and Motor B circuits. The encoder motor is bi-directional to allow the motor to shift the transfer case from 2HI or 4HI to neutral and 4LO positions.
Transfer Case Encoder
Your best bet ,take it to a qualified repair shop .
SOURCE: 2004 Suburban 4 wheel drive
set as default most likely either that or computer error. please email me at [email protected] with any other info or questions
SOURCE: 4 wheel drive wont swich back to 2 wheel drive
After reading some of the fixes here and on other forums,i bought a vacuum actuator and a transfer case switch.My mechanic came to fit these today,replaced the actuator and it didnt do anything.Turned out the old one was o.k..He couldnt find where the case switch went ,so he started tracing the vacuum pipes.
Guess what? he found not one ,but two broken pipes.he replaced/shortened these and hey presto,i now have 2,4 hi,4low and auto all working again.
It may be worth checking the vacumm pipes before buying other parts.
Just a thought...........
SOURCE: when you push the 4
a lot of 4wd you have to back up for a few feet to disengage the hubs after you tourn them back to 2wd
SOURCE: front axle acuator will not work
The brown wire you are talking about should have a whiteish colored plug. If you look very carefully at the junction box down below the dash, you should see a male terminal port to the right side of this junction box, it should have the abrieviation wht next to it. It is the switched power source, it comes from the 4x4 fuse in the upper fuse panel.
SOURCE: stuck in 4 wheel drive and wont come out.
hey there i cant tell you what you are missing but i can tell you how to disengage the front wheels . ok you have a vacum line that runs right under the battery and a line that comes up from the front diff. to the same place ( you may have to remove batt and batt tray to get full access to this) un bolt it and temporaly put batt and batt tray back in start it up and decompress this and see if it comes out .... you should here clunking noise if it goes back in ... if thats the case just pull that big vaccum line off .... to test get all four tires off the ground and have some one put it in drive but dont hit the gas it should turn on its own ...if that dont work check the cable that runs down to the differental
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