Drive Train Control Module (DTCM)

The DTCM receives the gated ASBM ON or OFF signals to request front and rear axle locker engagement as well as the disengagement requests from the customer. If the DTCM determines that a valid request to engage axle lockers has been made, the DTCM evaluates the engagement interlocks. If all axle locker engagement interlocks are satisfied, the DTCM will attempt to lock the desired axle(s). If all axle locker engagement interlocks are not satisfied, the DTCM will send data bus messages to the IPC to display to the driver which conditions must be satisfied prior to an attempt to locking the desired axle(s) can be made. The DTCM also sends a CAN C message to the IPC to request a "Service Axle Locker System" message be displayed to the driver. Any time there is a DTC set in the axle locker system, this message will display to the customer. Conditions such as loss of communication or other mechanical or electrical functional axle locker component issues can set a DTC.

The DTCM will only initiate a rear axle locker engagement if the ignition is in "Run" state. When the DTCM receives a request to lock the rear axle, each of the following interlocks must be satisfied before attempting a locking event:

• The DTCM will only initiate a rear axle locker engagement if transfer case is operating in low range (4LO) (4HI on Mojave)
• The DTCM will only initiate a rear axle locker engagement if vehicle speed is 16 Km/h (10 mph) or lower in 4LO. (Mojave 4HI the maximum speed is 110 mph.)
• The DTCM will only initiate a rear axle locker engagement if the difference in rear wheel speeds (Side to Side) is less than or equal to 32 Km/h (20 mph)

The DTCM will only initiate a front and rear axle locker engagement if the ignition is in "Run" state. When the DTCM receives a request to lock both front and rear axles, each of the following interlocks must be satisfied before attempting a locking event:

• The DTCM will only initiate a front axle locker engagement if transfer case is operating in low range (4LO)
• The DTCM will only initiate a front axle locker engagement if the rear axle locker is already engaged
• The DTCM will only initiate a front and rear axle locker engagement if vehicle speed is 16 Km/h (10 mph)
• The DTCM will only initiate a front and rear axle locker engagement if the difference in rear wheel speeds (Side to Side) is less than or equal to 32 Km/h (20 mph)

If the DTCM determines that a valid request to engage axle lockers has been made, the DTCM evaluates the engagement interlocks. If all axle locker engagement interlocks are satisfied, the DTCM will attempt to lock the desired axle(s). If all axle locker engagement interlocks are not satisfied, the DTCM will send data bus messages to the IPC to display to the driver which conditions must be satisfied prior to an attempt to locking the desired axle(s) can be made.

The DTCM also sends a CAN C message to the IPC to request a "Service Axle Locker System" message be displayed to the driver. Any time there is a DTC set in the axle locker system, this message will display to the customer. Conditions such as loss of communication or other mechanical or electrical functional axle locker component issues can set a DTC.