you need to intercept Loc first , the system'll not track the Glide without Loc.
Bit of a general statement,if i remember correctly on the 737CL ,arming APP was not to be done before established on the LOC.
On the 737NG,glide slope will not capture before the LOC.
Boeing 737NG Procedure
Once you intersept LOC and you are cleared for the ILS APP.
1) Landing Gear Down and FLAP 15 (you need a lot of drag).
2) Set APP on MCP ( "GS ARM" on FMA)
3) Set 1000 Ft AFE on the MCP.
4) Move V/S wheel and set no more than1500 V/S. (" VS" active on FMA).
5) When GS capture, set landing Flap.
Landing gear down and flaps 15 when LOc established?is that your airline procedure?in that case you must be living in the gulf where fuel is cheap...
Gear down by boeing is one dot to glide intercept(recommended),still too early if your glide starts at 6000 ft AGL.
The gear normally will be dalyed until a certain dme/alt to comply with your airline stabilized criteria.
If IMC:1000ft aal-speed 180,gear down at 7miles.
If vmc500ftaa-speed 160,gear down at 3.2 miles or speed 180 gear down at 5miles.