Speed Control Switches
| ITEM | DESCRIPTION |
|---|---|
| 1 | Speed limiter switch |
| 2 | 'Cancel' switch - Disengage speed control |
| 3 | 'SET+' switch - Engage speed control/increase speed |
| 4 | Time gap decrease switch - Vehicles equipped with adaptive speed control |
| 5 | 'RES" switch - Resume previous set speed |
| 6 | '-' switch - Decrease speed |
| 7 | Time gap increase switch - Vehicles equipped with adaptive speed control |
The speed control switches are located on the right steering wheel switchpack. The switches are connected via fly leads to the Clockspring (CLKSPG). The speed control switches are resistive ladder type switches. The speed control switches vary the resistance of a 5V signal, supplied from the Body Control Module/Gateway Module (BCM/GWM). The signal is returned on a Local Interconnect Network (LIN) bus, via the CLKSPG to the BCM/GWM.
On vehicles with standard speed control the BCM/GWM sends the control signals to the Powertrain Control Module (PCM). The control signals are transmitted on the Flexray bus.
On vehicles with adaptive speed control the BCM/GWM also sends the control signals to the Adaptive Speed Control Module (ASCM). The BCM/GWM transmits the signals to the ASCM via the High Speed (HS) Controller Area Network (CAN) chassis systems bus.
The adaptive speed control switches are the same as used for standard speed control, with the addition of 2 time gap switches. The time gap switches allow the driver to adjust the follow mode and forward alert functions to 1 of 4 pre-set time gaps.
The 4 pre-set time gaps are the following:
- Gap 1 = 0.8 seconds
- Gap 2 = 1.3 seconds
- Gap 3 = 1.8 seconds
- Gap 4 = 2.3 seconds.
The selected time gap is displayed in the message center when the time gap switches are operated.
When adaptive speed control is engaged, the switches adjust the follow mode time gap. When adaptive speed control is disengaged, the switches adjust the forward alert time gap (provided forward alert is enabled in the Instrument Cluster (IC) menu). The follow mode function defaults to the gap 3 setting each time the ignition is switched on. The forward alert function recalls the last selected time gap when the ignition is switched on.