1998-2001 Cadillac Seville (SLS)

Locate the tdm as in the picture below




Here is what the plug looks like


To install the Full bypass connect as following:

PRO Bypass 

 Car Wires


Splice into the wire at the TDM Connector PIN F (WHT)


Splice into the connector C1, Pin C (BLK)


Not Used


Not Used


Cut the wire in  TDM Connector Pin B, Yellow and attach this wire going towards the TDM


Splice into the wire at the TDM Connector  Pin J (BLK)


Be sure the light on the side of Pro Bypass module lights when the key is turned on. If there is no light then the Red or Black wire are not getting the power and ground. If the light is on then proceed with the instructions.


Turn off the key and open the PRO Module cover (this will NOT void the warranty) by removing the 2 screws on the bottom. Inside there are 2 sets of switches


1, Set SW1 (8 switches) as following:



2. Set SW2 (10 switches) as indicated in the first row of the table below.



3. Try to start the engine. If engine starts then replace the cover on the PRO Module, the installation is completed. Otherwise if the engine still doesn’t start, turn off the key and remove it from the tumbler, wait 4 minutes and then continue with step #4 here below.

4. Repeat step #3 above, but with SW2 as in row 2 of the table, then if still doesn’t start repeat again with SW2 as in row 3 of the table and so on until the right code is found and the engine will start.

IMPORTANT: If your car still does not start, please follow the troubleshooting directions for Hybrid Systems before contacting our support team. This will make it easier and faster for us to handle your support questions and will enable us to serve you better.​​

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