All Terrain Control Module (ATCM)

Based on road conditions, the driver selects what mode the system is in by moving the ATCM switch. The ATCM sends information via the HS-CAN to the:

• IPC
• ABS Module
• PCM

The AWD system adapts the responses of the vehicle's engine, transmission, suspension and stability control systems to match the demands of the terrain based on the ATCM switch positions:

• NOTE: Use Normal mode when towing a trailer.

  Normal - This mode is for on-road conditions. If not already active, Normal should be selected before driving on surfaces which are similar to a hard road surface. This mode should be selected once the need for a special mode has passed.

• Grass/Gravel/Snow - This mode should be used where a firm surface is covered with loose or slippery material. Surfaces covered in packed snow, ice, water, grass, gravel, or a thin coating of sand for example. For deep gravel, it is recommended that the Sand mode is selected. If the vehicle is unable to gain traction in deep snow, switching traction control off may help. Traction control should be switched on again as soon as the difficulty is overcome.
• NOTE: The Mud/Ruts and Sand modes are for off-road use only.

  Sand - This mode should be used for soft dry sand, or deep gravel terrain. If the sand to be crossed is damp/wet, and sufficiently deep enough to cause the wheels to sink into the surface, the Mud/Ruts mode should be selected.

• Mud/Ruts - This mode should be used for muddy, rutted, soft, or uneven terrain.

If the terrain management system becomes inoperable due to a system malfunction, all of the mode indicators on the control turns off and the message center displays one of the these messages:

• TERRAIN MANAGEMENT SYSTEM FAULT: If this message is displayed, cycling the key may clear the fault.
• MODE CHANGE NOT ACCEPTED, RETRY: If this message is displayed, a vehicle system cannot support a mode change at the time of driver request. Try the mode change again.