Nissan Armada 2025-2026 Service and Repair Manual: Precautions for High Strength Steel (HSS) and Ultra High Strength Steel (UHSS)
High strength steel (HSS) means the steel from 440 MPa - 979 MPa.
Ultra high strength steel (UHSS) means the steel above 980 MPa.
(a) The repair of reinforcements (such as side members) by heating is not recommended since it may weaken the component. When heating is unavoidable, do not heat HSS parts above 550°C (1,022°F). Verify heating temperature with a thermometer. (Crayon-type and other similar type thermometer are appropriate.)
When you heat the HSS or UHSS parts above 550°C (1,022°F), it must be replaced with new parts.
(b) When straightening body panels, use caution in pulling any HSS panel. Because HSS is very strong, pulling may cause deformation in adjacent portions of the body. In this case, increase the number of measuring points, and carefully pull the HSS panel.
(c) When cutting HSS panels, avoid gas (torch) cutting if possible. Instead, use a saw to avoid weakening surrounding areas due to heat. If gas (torch) cutting is unavoidable, allow a minimum margin of 50 mm (1.97 in).
(d) When welding HSS panels, use spot welding whenever possible in order to minimize weakening surrounding areas due to heat.
If spot welding is impossible, use MAG welding. Do not use gas (torch) welding because it is inferior in welding strength.
(e) The spot weld on HSS panels is harder than that of an ordinary steel panel.
Therefore, when cutting spot welds on a HSS panel, use a low speed high torque drill (1,000 rpm - 1,200 rpm) to increase drill bit durability and facilitate the operation.
Cutting Off Welded Portions
A vehicle body is constructed by using three different welding methods [spot welding, MAG and brazing]. Cutting welded portion by these methods is described below.
Spot welding is generally used on tw ...
Prohibition for Ultra High Strength Steel (UHSS)
Ultra high strength steel (UHSS) means the steel from 980 MPa or higher.
Never cut and joint the panel, plate and reinforcement made of ultra high strength steel (UHSS).
If such part is damaged, repl ...
Other materials:
Diagnosis Procedure
CHECK DOOR SWITCH
Check door switch. Refer to ComponentFunctionCheck.
Is the inspection result normal?
YES>>
GO TO 2.
NO>>
Replace the malfunctioning door switch
CHECK HOOD SWITCH
Check hood switch. Refer to Component Function Check.
Is the inspection result normal?
YES>>
GO TO ...
Diagnosis Procedure
CHECK STEERING TILT MECHANISM
Check for the following.
Mechanism deformation or pinched foreign materials.
Interference with other parts because of poor installation.
Is the inspection result normal?
YES>>
GO TO 2.
NO>>
Repair or replace the malfunctioning parts.
CHECK TILT SWITCH
Che ...
VDC OFF SWITCH : Removal & Installation
REMOVAL
NOTE:
The VDC OFF switch is integrated with the select switch unit.
Remove front center console switch finisher assembly. Refer to Removal and Installation.
Remove the screws , and remove select switch unit with multi function switch from front center console switch finisher assembly .
R ...
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