I am wondering if that is not indicating there is a system fault. Explain the flashing in detail, and I will provide you with the info that I have. When you are just turning the truck on, in 2WD, the indicator is?, on solid?. Say you make your first request to 4HI, does all the indicators flash, or just 4HI? Does it continue, or revert back to 2WD? What about 4LO? It is capable of displaying trouble codes through that switch(indicators), it requires jumping a terminal at the DLC connector, are you familiar with that connector?
Fig. 25 Data Link Connector Pin Terminals
Displaying Diagnostic Trouble Codes
Install jumper wire between DLC terminal 13 and ground, Fig. 25 . The DLC is located under the lefthand side of the instrument panel, right of the steering column.
Turn ignition switch to On position.
Wait three seconds, then observe transfer case switch status lamps.
Reading Diagnostic Trouble Codes
The transfer case status lamps will flash to indicate the DTC's stored in memory. If only one DTC is stored in memory, that DTC flashes repeatedly with a three second delay between flash sequences. If more than one DTC is stored in memory, the first DTC flashes once, then the next code is flashed. This sequence continues to flash until the jumper wire is disconnected.
Fig. 28 Test A: Status Lamps Flash
You said you disconnected the battery, and one would think that would clear a fault, but here is the code clearing procedure.
Clearing Diagnostic Trouble Codes - NV 243 (Electric Shift)
Turn ignition switch Off.
Remove T-case 20 amp fuse.
Wait a minimum of two minutes and 30 seconds, then replace fuse.
Cycle ignition switch On and Off 5 times.
Wednesday, October 27th, 2010 AT 11:19 PM