APPENDIX E WELDING ON VEHICLE/VEHICLE INTERFACE MODULE
W T E C I I I E L E C T R O N I C C O N T R O L S T R O U B L E S H O O T I N G M A N U A L
WELDING ON VEHICLE
When frame or other welding is required on the vehicle, take the following precautions to protect the electronic
1. Disconnect the wiring harness connectors at the transmission electronic control unit.
2. Disconnect the positive and negative battery connections, and any electronic control ground wires
connected to the frame or chassis.
3. Cover electronic control components and wiring to protect them from hot sparks, etc.
4. Do not connect welding cables to electronic control components.
VEHICLE INTERFACE MODULE
The Allison Vehicle Interface Module (VIM) containing all Allison system relays and fuses must be used as the
interface to all vehicle wiring. Refer to Figure E2 for VIM component location and pin-out.To close an open VIM,
tighten the bolts in the numerical order shown in Figure E1 to provide a sealed, water-tight box. Torque the bolts
to 58 N·m (46 lb ft).
Figure E1. Vehicle Interface Module
Do not jump start a vehicle with arc welding equipment. Arc welding
equipments dangerously high currents and voltages cannot be reduced to safe