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Originally Posted by deserth3
I'm not an expert but I'd check the wiring going into the diff. There's most likely a connector and it may have come disconnected.
If that don't work take her to the dealer.
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Worth a try, but it should set a code (C0388), and turn on the indicator lamp.
It is a simple circuit, the TCCM supplies 12-volts to the rear locker solenoid on the (L-Green wire), and supplies a ground via the black wire to the TCCM. This is also the monitoring circuit. If the TCCM sees the request for axle lockup via the switch, and it energizes the actuator, and no feedback signal is obtained it should set the code.
Wisha Haddan H3:
Try this....
Go back to normal 4-wheel, then bring the vehicle down to less than 3 mph or to a full stop, put the trans in neutral, engage 4-wheel low lock and immediately engage the rear locker. Might work....