Circuit/System Verification

Verify that DTC U0073, U0074, U1814, B1428, B1370, B1380, B1440, B1441, B1325, or P0562 is not set.
- If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Verify that DTCs U1817, U1818, U182A, and U1844 are not set.
- If all the DTCs are set, refer to DTC U0074 (Mid Speed or Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus) .