The system has three alert stages for a possible collision. However, depending on circumstances, the CMBSTM may not go through all of the stages before initiating the last stage.
Honda Civic Owners Manual. Brake Light, Tail/Rear Side Marker Light, Rear Turn Signal Light and Back-Up
Light Bulbs
When replacing, use the following bulbs.
Brake Light: 21 W
Tail/Rear Side Marker Light: LED
Rear Turn Signal Light: 21 W (Amber)
Back-Up Light: 16 W
Use a Phillip-head screwdriver or socket to
remove the bolts.
Pull the light assembly out of the rear pillar.
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