Speed Control Switches
| ITEM | DESCRIPTION |
|---|---|
| A | Vehicles with standard speed control |
| B | Vehicles with adaptive speed control |
| 1 | Set speed '+' switch - engage speed control/increase speed |
| 2 | Resume 'RES' - resume previous set speed |
| 3 | Set speed '-' switch - decrease speed |
| 4 | Cancel 'CAN' - disengage speed control |
| 5 | Time gap decrease switch - on vehicles with adaptive speed control only |
| 6 | Time gap increase switch - on vehicles with adaptive speed control only |
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 which vary the resistance of a 5 volt signal supplied from the Body Control Module/Gateway Module (BCM/GWM) assembly. The signal is returned on a Local Interconnect Network (LIN) bus, via the CLKSPG to the BCM/GWM assembly. The BCM/GWM assembly sends the control signals on the High Speed (HS) Controller Area Network (CAN) powertrain systems bus for use by the Powertrain Control Module (PCM) and to the Adaptive Speed Control Module (ASCM) on vehicles with adaptive speed control.
The adaptive speed control switches are the same as used for standard speed control, with the addition of two time gap switches. The time gap switches allow the driver to adjust the follow mode and forward alert functions to one of four pre-set time gaps (gap 1 = 1. 0 second, gap 2 = 1.4 seconds, gap 3 = 1.8 seconds, gap 4 = 2.2 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.