Don’t wait till it’s to late!!

 The ECM is located behind the felt liner in the front driver side wheel well. Park the vehicle and steer to the left to make room for removing the ECM, then shut off the vehicle. Wait 5 minutes before continuing to allow the vehicle to fully shut down. 

Note: Our testing has shown that the vehicle may not allow the  engine to start at full steering lock upon ECM reinstallation. not leave  steering at full lock to the left. After steering all the way to the left,  steer slightly to the right to ensure that steering is not at full lock. 

 Using a 3/32" Allen Wrench or Hex Key, remove the indicated eight  screws. Keep the screws for reinstallation. From the front of the  wheel well, pull the felt liner back to expose the ECM 

 Remove the 3 connectors from the ECM. Each of them has a red  tab (1). Slide the red tabs back to unlock each connector. Once the  red tabs have been released, press the black tabs (2) down into the  connector to release the locking clamps. Rotate the locking clamps  (3) all the way back to release the connectors 

 The ECM is secured in its cradle by two large plastic tabs on the top  of the ECM. With your thumbs, push up on each tab while pulling the  ECM towards the rear of the vehicle. Once both tabs are released,  the ECM is now free of the vehicle and may be pulled out of the  wheel well. 

Removing OEM plastic ECM mount. Remove the (2) 10mm bolts on  the bottom front of plastic mount. There will be a two additional  10mm bolts on the plastic mount that will need to be removed.  There is a bolt on the top right plastic and below the mount that  needs to be removed. During this step the Gray plastic trim tab on  top of plastic mount also needs to be removed. 

Bosch module removal back of OEM ECM mount. Once the ECM mount is free from the vehicle the Bosch Module needs to be slid off the ECM mount to the left (towards installer) 

Move the three ECM connectors out of the way to make room for reseating the new ECM mount (Croc Loc™). Once the Croc Loc™ is placed into the OEM ECM mount location it will be affixed to the truck by (2) 10MM bolts. The front mounting bolt will utilize factory bolt that was removed. Secondary bolt at the bottom back of unit will come with Croc Loc™ 

Place the vehicles ECM inside the Croc Loc™ unit. Press each of the three ECM connectors back into the ECM, close the connector clamps until they click into place, then slide in the red locking tabs.  Place Croc Loc™ lid on and affix with supplied lock and bolts that affix to lid through the sides of the Croc Loc™. Factory Bosch module will affix to the top of the Croc Loc™ system by supplied double sided heavy duty mounting tape. Place the felt liner of the wheel well back into the front of the wheel well and reapply the screws.