Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2011 Buick Lucerne CXFACTORY OEM SERVICE PROCEDURE
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors X1, X2, and X3 of the CCSM.
- Test for less than 1Ξ© between the module ground circuit terminal M X1 and ground.
- If greater than the specific range, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit terminal E X1 and ground.
- If the test lamp does not illuminate, test the battery positive voltage circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the positive voltage outputs of the module for a short to ground. If all circuits test normal, replace the CCSM.
- Ignition ON, verify that a test lamp illuminates between ignition voltage circuit terminal 1 X2 and ground.
- If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the positive voltage outputs of the module for a short to ground. If all circuits test normal, replace the CCSM.
- Test for infinite resistance between the data link connector (DLC) keyword 2000 serial data circuit terminal 7 and ground.
- If less than the specified value, test the serial data circuit for a short to ground.
- Test for less than 1V between the DLC keyword 2000 serial data circuit terminal 7 and ground.
- If greater than the specified range, test the serial data circuit for a short to voltage.
- Test for less than 1Ξ© in the keyword 2000 serial data circuit between the CCSM terminal 9 X3 and the DLC terminal 7.
- If greater than the specified range, test the serial data circuit for open/high resistance.
- If all circuits test normal, replace CCSM.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.