Circuit/System Testing
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connectors X1, X2, and X3 of the CCSM.
- Test for less than 1Ω 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 1Ω 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.