Question about 2000 Chevrolet Blazer

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Service 4x4 light is on the dash 2000 chevy blazer

It is engaged in 4WD right now and I can't get it to shift into 2HI,4HI,or 4LO just wondering is there any way of checking the module in the kick panel on the passengers side or is there a scanner that I can buy to check for what is causing it

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You will have to put it on a scanner to check the code

Posted on Feb 03, 2010

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Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
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There are two motors under the vehicle. The front axle actuator moves ONLY during 2HI->A4WD and A4WD->2HI transitions. The transfer case encoder motor makes a lower pitched noise in every mode transition: 2HI->A4WD, A4WD->4HI, and 4HI->4LO, and the three transitions upwards.

If EITHER of the motors fails to do what the TCCM commands it to do, the switch light will flash and the Service 4WD light on the dash will come on.

If you're a DIY mechanic, you might look into them further, or just take it to a mechanic who knows our systems. The average mechanic is not going to know the theory of operation of the trailblazer/envoy 4x4 system, which is pretty unique in the industry

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Hi, 2hi is your normal driving selection, this is NOT in 4WD mode. Both 4lo and 4hi is for 4 wheel driving, 4lo is used in extreme conditions and will gear the vehicle down to a very slow speed with maximum traction at the wheels, 4hi is for general 4 wheel driving in rough terrain, if you have lights on the dash than it will come on when you change gears, hope this help

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