The wiring method of Jetta fog lamp is to connect the negative lead to the negative battery and the positive lead to the fuse box in the engine compartment. The fog lamp switch is located on the light pole on the left side of the steering wheel, which can be turned on by rotation. To turn on the fog lights, first turn on the small lights, turn the knob forward to turn on the front fog lights, and turn the knob backward to turn on the rear fog lights. There are small lights, width indicator lights, low beam lights and headlights on the optical shift lever. Fluctuating up and down can turn on the left and right turn signals of the vehicle, and turn them off in the middle. The replacement method of the rear fog lamp is as follows: 1. Open the trunk of the vehicle and remove the fixing screws on both sides of the trunk; 2. Loosen the fixing screws of the rear wheel cover of the vehicle, pry open the buckle under the vehicle and pry open the bayonet of the taillight; 3. After removing the rear decorative panel, check whether there is a wiring harness connection, and then remove the rear fog lamp decorative panel; 4. Install the fog lamp holder on the original decorative board and insert the wiring harness.