1356 Electric Shift Motor Troubleshooting & Repair - BEST PROCESS!
Source: by Dustin S
read it all; esp.;
No Range Shift
If the vehicle won't shift into 4L, check the speed sensor and the transmission interlocks (neutral or clutch in). Also check the 4L switch (C3) to see if the module is getting a signal. Be sure to check for corroded connections.
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Indicator Lights Don't Register the Correct Information
If the lights are on all the time, look for a short to ground. Also check to see if the shift control module is activating them all ... this is a malfunction.
If the LED lights, in the buttons, remain on all the time, first check to see if the dash lights are also on. If the dash lights are not on, this means that the dash lights have burned out. The LED lights are on because a low current is still passing across, enough to light the LED.