GF30.30-P-3003GQ Cruise Control Function

GF30.30-P-3003GQ Cruise Control Function
- with CODE (440) Cruise control
- as of model year 2009

Component Identification:

Function requirements of the cruise control function, general
^ Circuit 61 "ON" (engine running)
^ CC [TPM] (cruise control) coded in central gateway control unit (N93)
^ Electronic Stability Program (ESP) not deactivated
^ Electronic Stability Program active (no fault)
^ Vehicle speed ≥30 km/h
^ Parking brake not applied
^ Gear range "D" engaged
^ CC [TPM] push button (S40 or S40/4) in the cruise control position (LIM indicator lamp (LIMITER) off) (except code (494) USA version)

Cruise control function, general
The cruise control is integrated into the ESP control unit (N47-5) or the recuperative brake system control unit (N30/6) (with hybrid). The cruise control maintains the constant speed specified by the driver, irrespective of engine load condition and without the accelerator pedal having to be actuated.
The signals from the CC [TPM] push button switch are monitored by the steering column tube module (N80) and sent over the engine compartment CAN (CAN C) to the ESP control unit or to the recuperative brake system control unit (with hybrid).

The set specified speed is sent by the ESP control unit or the recuperative braking system control unit (with hybrid) over the engine compartment CAN (CAN C) to the instrument cluster.

The requests for acceleration or deceleration (for engine control intervention) are sent by the ESP control unit or the recuperative brake system control unit (with hybrid) over the engine compartment CAN to the CDI control unit (N3/9) (with diesel engine) or to the ME-SFI [ME] control unit (N3/10) (with gasoline engine).

Shift requests to the automatic transmission (except hybrid) are transmitted by the ESP control unit over the engine compartment CAN to the electric controller unit (VGS) (Y3/8).
A shift request to the automatic transmission is sent by the hybrid from the recuperative brake system control unit over the hybrid CAN (CAN L) to the hybrid fully integrated transmission controller unit.

Function sequence of cruise control function
The function sequence is described in the following steps:
^ Activation function sequence
^ Function sequence of the speed control
^ Deactivation function sequence

Activation function sequence
Pulling out the cruise control push button, or moving it up or down, activates the cruise control starting from a vehicle speed of 30 km/ h.
If the cruise control push button is moved up or down, the current vehicle speed is stored as the specified speed and either raised or lowered depending on whether the pushbutton is moved up or down.

If the CC push button is pulled out, the last specified speed stored is applied, provided a specified speed has been stored since the last engine start. If no specified speed has been stored, the cruise control sets the current vehicle speed as the specified speed.

The CC [TPM] switch can be moved up or down to different degrees to increase or reduce the specified speed in 1 km/h or 10 km/h increments (two settings).

When the cruise control is activated, the segments in the electronic speedometer (A1p8) are illuminated from the beginning of the scale up to the set specified speed.

Function sequence of the speed control
When the vehicle is approaching the specified speed, engine power is automatically reduced. If this is not enough to prevent the vehicle exceeding the specified speed for example, on a steep downward gradient), the service brake is applied and modulated and the automatic transmission downshifted as necessary.

If the vehicle is accelerated above the specified speed (for example, when overtaking), the cruise control reapplies the specified speed after the accelerator pedal is released.

Deactivation function sequence
The cruise control mode is deactivated if:
- The CC [TPM] switch is pushed forwards
- The CC [TPM] push button switch is pressed in the Variable Speed Limiter position to switch over (LIM indicator lamp is lit) (except code (494) USA version)
- The brake pedal is operated.
- Parking brake is actuated
- Gear range "N" or "R" engaged
- ESP operates
- ESP switched off
- ESP deactivated (a fault)
- Vehicle speed <30 km/h
- Circuit 15 OFF (ignition OFF)