Operation CHARM: Car repair manuals for everyone.
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

Telematic Control Unit tcu

Telematic Control Unit TCU
The Telematic Control Unit TCU is optional equipment in US vehicles. This means that an emergency call can always be made (if the car is equipped with the TCU), also if the customer has not (yet) retrofitted a telephone.
The range of functions of the US version is as follows:
^ TCU is always fitted in order to ensure the emergency call can be made even if no telephone is present
^ Dualband 800 MHz and 1900 MHz
^ Combined transmit/receive module NAD (Network Access Device) for analog AMPS (American Mobile Phone Standard) for telephone calls and digital CDMA (Code Division Multiplex Algorithm) for telematics functions
^ Eject box with charging unit for Motorola Phoenix V60
^ Telematics functions (E/B call)
^ GPS receiver for localization