Code Enable Criteria
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The following must occur for DTC to run:
- Ignition switch must be in RUN or ACC positions.
- System voltage must be 9-16 volts.
- DTC U1500 sets when VIU detects no communication between VIU and VCU for 300 milliseconds.