Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Speed Control Switches
| ITEM | DESCRIPTION |
|---|---|
| A | Vehicles with standard speed control |
| B | Vehicles with adaptive speed control |
| 1 | 'RES' switch - Resume previous set speed |
| 2 | 'SET +' switch - Engage speed control/increase speed |
| 3 | 'CANCEL' - Disengage speed control |
| 4 | '-' switch - Decrease speed |
| 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. The speed control switches vary the resistance of a 5V 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.
On vehicles with standard speed control the BCM/GWM assembly sends the control signals on the FlexRay bus for use by the Powertrain Control Module (PCM). On vehicles with adaptive speed control the BCM/GWM assembly sends the control signals on the High Speed (HS) Controller Area Network (CAN) chassis systems bus. The control signals send to the Adaptive Speed Control Module (ASCM) also.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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