Diagnostic Aids
WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
- If P3056 is set, verify ECM and T19 Power Supply Converter grounds are clean and tight.
- Verify all devices powered by the T19 Power Supply Transformer are operating properly.
- B+ circuit terminal 11 supplies voltage to output circuit terminal 10, function 12v regulated supply voltage 1
- B+ circuit terminal 8 supplies voltage to output circuit terminal 9, function 12v regulated supply voltage 2