No... if both indicator light are flashing its NOT locked in 4HI.......
When everythings ok and your in low and locked ( both lights on ) and then go to high both lamps will start flashing indicating that even though YOU turned the lockers on the ECU has overridden you. Drop back to low and the lockers will reengage.
So..... flashing light(s) = NOT LOCKED, Light(s) ON solid=LOCKED
If I had to guess your rear locker engaged switch if stuffed... not uncommon.
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It seemed like a good idea at the time........
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