Inspect the belt for cracks or damage. If the belt is cracked or damaged, replace it.
Check that the position of the auto-tensioner indicator (A) is within the standard range (B) as shown. If it is out of the standard range, replace the drive belt.

Honda Fit 2007-2026 Navigation Online Reference Manual
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Removal (Part -2)
Remove the harness clamp (A) from its clamp bracket (B) located in front
of the left damper top.
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Automatic Transmission
Shift Lever Position Indicators
These indicators on the instrument panel show which position the shift lever
is in.
The ‘‘D’’ indicator comes on for a few seconds when you turn the ignit ...