Circuit/System Verification
- Ignition ON.
- Verify DTC U0078 is not set.
- If DTC U0078 is set
Refer to Scan Tool Does Not Communicate with Low Speed GMLAN Device .
- If DTC U0078 is not set
- If DTC U0078 is set
- All OK
Refer to Scan Tool Does Not Communicate with Low Speed GMLAN Device .