Toyota Auris 2013 Owner's Manual page 248

248
4-1. Before driving
NOTICE
 When the rear bumper strengthening material is aluminum
Ensure the steel bracket part does not come directly in contact with that
area.
When steel and aluminum come into contact, there is a reaction similar to
corrosion, which will weaken the section concerned and may result in dam-
age. Apply a rust inhibitor to parts that will come in contact when attaching a
steel bracket.
UK_AURIS/AURIS_HV_EE (OM12F76E)