Circuit/System Testing
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition Off and all vehicle systems Off.
- Disconnect the KR121B Reductant Control Module Relay 2.
- Test for less than 1 V between the ignition circuit terminal 87 & Ground.
- If 1 V or greater
- Repair the short to voltage in the circuit.
- Go to next step: If less than 1 V
- Test or replace KR121B Reductant Control Module Relay 2.
NOTE:
It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
NOTE:
It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.