Start Control Module (SCU)
The start control module (SCU) is in the dashboard beside the steering wheel. Start control module (SCU) contains:
- a module for the remote key
- a motor for drawing in and ejecting the remote key
- a starter button.
The control module also contains 3 contact breakers that are mounted on top of the spring where the remote key is inserted. The contact breakers are activated on different occasions via a sledge when the remote key is inserted in the spring:
- Switch key-inserted: activates the motor for drawing in the remote key in the Start control module (SCU).
- Switch for locked remote key: informs the Central electronic module (CEM) that the remote key is in its locked position.
- Switch for ejection: activates the motor for ejecting the remote key when the remote key is pushed in after it being in its locked position. In order for the remote key to be ejected, the engine must not be running, the vehicle must not be moving (speed must be 0) and for vehicles with automatic transmission, the gear selector lever must be in position P.
The Start control module (SCU) has an internal antenna that can be activated on command from the Central electronic module (CEM). The antenna is used for checking the key identity when the remote key is inserted into the compartment on the Start control module (SCU). The antenna ring is activated by the central electronic module (CEM) when the signal from the key-in contact breaker has been received
The starter button has two contact breakers.
One is directly connected to the central electronic module (CEM), the keyless vehicle module (KVM) and the engine control module (ECM).
The other is managed internally in the Start control module (SCU) which transmits the contact breaker's status to the Central electronic module (CEM) via serial communication (LIN).
Both contact breakers must be closed when the starter button is depressed. It is sufficient for one contact breaker to close for the steering wheel lock to be unlocked and the vehicle to be started. However, both contact breakers must be closed for the steering wheel lock to be unlocked when switching off the engine. This is for safety.
The remote key does not need to be in the compartment on the start control module (SCU) if there is a keyless vehicle module (KVM) in the vehicle. The identity of the remote key is then checked via the antennas in the passenger compartment instead. These antennas are connected to the keyless vehicle module (KVM) when the starter button is pushed.
The steering column lock module (SCL) is powered by the central electronic module (CEM) and grounded in the body.