Removal and Installation: Removal

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Battery acid and battery acid fumes are extremely dangerous and can cause severe burns and explosion. To help reduce the risk of personal injury:

Wear appropriate goggles and protective clothing.
Always properly ventilate the area where the service is being performed.
Never allow battery fluid to come in contact with skin, eyes, fabrics or painted surfaces.
To avoid arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.
If acid contacts eyes, skin or clothing, immediately flush with water for 15 minutes and seek medical attention.

Disconnect the battery or batteries. Refer to Battery Disconnect .
Disconnect the SCR control unit harness connectors (B) and remove the bolt (A) from the SCR control unit (1).

Courtesy of NISSAN NORTH AMERICA, INC.
Remove the SCR control unit.