Cruise control function - GF30.30-P-3003GQ
ENGINES 156, 272, 273, 629, 642 in MODEL 164.1 with CODE (440) Cruise control as of Model Year 2009/CY 08 model refinement package
ENGINES 273, 629, 642 in MODEL 164.8 with CODE (440) Cruise control as of Model Year 2009/CY 08
ENGINES 272, 273, 642 in MODEL 251 with CODE (440) Cruise control as of Model Year 2009/CY 08
View of instrument cluster (A1) with cruise control activated
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 (LIM ITER) 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)
| Electrical function schematic for cruise control (CC) | Model 164 | PE30.30-P-2051-97MAB | ||
| Model 251 | PE30.30-P-2051-97RAB | |||
| Instrument cluster, component description | A1 | Except hybrid | GF54.30-P-6000GM | |
| A1 | With hybrid * for USA only |
GF54.30-P-6000GQH | ||
| Component description for CDI control unit | N3/9 | Engine 642.8 in model 164.1/8, 251.1 | GF07.16-P-6000OGU | |
| N3/9 | Engine 642.9 in model 164.1/8, 251.0/1 | GF07.16-P-6000OHG | ||
| N3/9 | Engine 629.9 in model 164.1/8 | GF07.16-P-6000OAG | ||
| ME-SFI [ME] control unit, component description | N3/10 | Engine 156.980 in model 164.177 | GF07.61-P-6000MAG | |
| N3/10 | Engine 272.9 in model 164.1, 251.0/1 except engine 272.973 hybrid | GF07.61-P-6000MIG | ||
| N3/10 | Engine 272.973 hybrid * for USA only |
GF07.61-P-6000MQH | ||
| N3/10 | Engine 273.9 in model 164.1/8, 251.0/1 | GF07.61-P-6000MLG | ||
| Component description for regenerative braking system control unit | N30/6 | With hybrid * for USA only |
GF42.22-P-1100GQH | |
| ESP control unit, component description | N47-5 | Except hybrid | GF42.45-P-5118GM | |
| Component description for steering column tube module control unit | N80 | GF54.21-P-6051GM | ||
| Fully integrated transmission control unit, component description | Y3/8n4 | Except hybrid | GF27.60-P-5165AHZ | |
| Component description for fully integrated transmission control controller unit | Y3/10 | With hybrid * for USA only |
GF27.60-P-5169GQH |