a.  Insert the intrusion switch into the cage.
b. 
Route the cable into the cable clip.
Step 4.  Connect the cable of the intrusion switch to the intrusion switch connector on the system board. 
See “Intrusion switch” on page 226.
Step 5.  Re-install the number 4 fan. 
After you finish
Complete the parts replacement. See 
“Complete the parts replacement” on page 215.
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ThinkSystem SR635 V3 User Guide