Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

TAC Brake Switch

Scan tool displays APPLIED or RELEASED. Indicates the brake pedal position. When the brake pedal is depressed a signal voltage is sent to the TAC module, that signal is then sent to the PCM across serial data. If a fault occurs on this circuit known as the Stoplamp Switch Circuit, a P1574 will set.