EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 150; Flight Crew Total 6800
Confusion; Troubleshooting
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter CFTT / CFIT
Flight Crew Diverted; Flight Crew FLC Overrode Automation; Flight Crew Took Evasive Action
Aircraft
Doing ILS approach Runway XX at ZZZ at night at minimums conditions overcast at 200 ft. and 5 sm visibility between 600 and 400 feet the nose of the plane pushing down rapidly and we got 'Terrain Terrain' and Pull up EGPWS warning.Also at arriving at our diverted airport ZZZ1 at the moment to capture the ILS Runway XY the localizer couldn't keep the needle centered; chasing left and right. We had to disconnect autopilot and fly aircraft manually. Weather was overcast at 600 ft.Autopilot system malfunctioned.At ZZZ approach we have to execute an escape maneuver and go around and divert to alternate airport ZZZ1.As I mentioned above during both approaches we encounter autopilot; localizer and glide slope indication malfunctions; which is not safe under the weather conditions.
ERJ145 First Officer reported autopilot and navigation malfunctions during approach that resulted in a diversion.