Question about 2002 Chevrolet Blazer
Previously able to shift into 4HI by manual procedure - no longer to do even that. Transfer case will shift into 4LO. Owners manual says the transmission indicator switch may require adjustment - how is this done?
Try resetting the 4X4 module first. Remove the courtesy lamp and ATC fuses for at least 1 minute the reinstall fuses. Cycle key on and off 5 times then try your four wheel. Please rate if this works.
Posted on Dec 04, 2008
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Posted on Jan 02, 2017
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May 10, 2016 | Jeep Cars & Trucks
each time the ignition is cycled, all 5 mode indicators light simultaneously, as an indicator check to ensure proper operation of the indicators. 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 continues to flash until the transfer case shift control module completes the shift.
a solid state circuit, located inside the switch, supplies ignition voltage to the lamps. the solid state circuit also receives voltage when the headlamp switch is in the parklamp or headlamp position. when the solid state circuit receives voltage from the headlamp switch, the circuit reduces the voltage that is supplied to the indicator lamps, dimming the lamps when the headlamps are on.
the numbers below refer to the step numbers on the diagnostic table.
ability of the transfer case shift control module to communicate through the data link connector (dlc)
existence of atc dtcs
incorrect parts replacement
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