Angular RxJs BehaviorSubject not updating properly

I'm trying to share a string value from sibling components(light-switch to navbar). My problem is that the property themeColor is not getting updated when I emit the new value from my DataService.

Here is my structure for my App.Component.html:

<navbar></navbar>
<banner><light-switch></light-switch></banner>

I'm trying to use a DataService:

import {Injectable} from '@angular/core';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';

@Injectable()
export class DataService {

  private themeColor = new BehaviorSubject<string>("#f5f0f0");
  currentThemeColor = this.themeColor.asObservable();

  constructor() { }

  changeThemeColor(color: string) {
    this.themeColor.next(color)
  }

}

This is my light-switch.component.ts:

import { Component, OnInit } from '@angular/core';
import {DataService} from "./../Services/DataService";

@Component({
  selector: 'light-switch',
  templateUrl: './light-switch.component.html',
  styleUrls: ['./light-switch.component.scss']
})
export class LightSwitchComponent implements OnInit {
  public currentTheme;
  public themeColor;

  constructor(private sanitization: DomSanitizer, private dataService: DataService) { 
    this.currentTheme = "dark";
    this.themeColor = "#f5f0f0";
  }

  ngOnInit() {
    this.dataService.currentThemeColor.subscribe(color =>{ this.themeColor = color});
  }

  changeToLight(){
    this.dataService.changeThemeColor("black");
  }
  changeToDark(){
    this.dataService.changeThemeColor("#f5f0f0");
  }
}

And my navbar.ts:

import { Component, OnInit } from '@angular/core';
import {DataService} from "./../Services/DataService";

@Component({
  selector: 'navbar',
  templateUrl: './navigation-bar.component.html',
  styleUrls: ['./navigation-bar.component.scss']
})
export class NavigationBar implements OnInit {
  private themeColor;
  constructor(private dataService: DataService) {
  }

  ngOnInit() {
    this.dataService.currentThemeColor.subscribe(color => {this.themeColor = color});
  }
}

NavigationBar.html:

<div class="navbar">
  <i class="fa fa-github bannerIcon" id="githubIcon" [style.color]='themeColor'></i>
  <i class="fa fa-linkedin bannerIcon" id="linkedInIcon" [style.color]='themeColor'></i>
</div>

Light-switch.html:

<div id="lightSwitch">
  <button class="btn btn-secondary switchBtn-on" (click)="changeToLight()">On</button>
  <button class="btn btn-secondary switchBtn-off">Off</button>
</div>

I have DataService as a provider in my App.Module.ts. When ngOnInit runs in navbar.ts, it does get the default value I set and when I call the changeThemeColor() in light-switch.ts, it does go into DataService.ts and change the currentColor property, but again, the themeColor property in navbar.ts does not update to that currentColor property. I suspect there is some sort of event listener I need to correctly get the value from DataService to navbar, but I thought that's what I subscribed for.