Circuit/System Testing
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF and all vehicle systems OFF, disconnect the connector at the appropriate E17 Outside Rearview Mirror Glass:
- E17D Outside Rearview Mirror Glass - Driver = X510
- E17P Outside Rearview Mirror Glass - Passenger = X610
- Verify a test lamp illuminates between ground circuit terminal 5 and B+.
- If test lamp does not illuminate
Repair the open/high resistance on the appropriate circuit or ground connection:
- E17D Outside Rearview Mirror Glass - Driver = Circuit 2150
- E17P Outside Rearview Mirror Glass - Passenger = Circuit 2250
- Go to next step: If the test lamp illuminates
- If test lamp does not illuminate
- Engine running, connect a test lamp between the control circuit terminal 8 and the ground circuit terminal 5.
- Verify the test lamp turns ON when operating the rear defogger switch.
- If the test lamp is always OFF
- Ignition OFF, remove the test lamp, disconnect the appropriate connector at the S79 Door Switch Panel Control Module:
- S79D Front Side Door Window Control Switch - Driver = X1 Connector
- S79P Front Side Door Window Switch - Passenger
- Test the appropriate circuit for an open/high resistance:
- S79D Front Side Door Window Control Switch - Driver = Circuit 606
- S79P Front Side Door Window Switch - Passenger = Circuit 607
- If an open/high resistance is found, repair the fault on the circuit or ground connection.
- Go to next step: If an open/high resistance is not found.
- Replace the appropriate S79 Front Side Door Window Switch.
- Go to next step: If the test lamp turns ON
- Test or replace the E17 Outside Rearview Mirror Glass.