Circuit/System Verification

Ignition ON.
Verify that DTC U0293 is not set.
- If DTC U0293 is set
  Refer to DTC U0100-U02FF (without HP6) DTC U0100-U02FF (with HP6) .
- If DTC U0293 is not set
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 .
- If none of the DTCs are set
Verify that DTCs U1817, U1818, U1844, and U1847 are not set.
- If all of those DTCs are set together
  Refer to DTC U0074 (Chassis Expansion Bus) DTC U0074 (Powertrain Expansion Bus with HP6) DTC U0074 (Powertrain Expansion Bus without HP6) .
- If all of those DTCs are not set together
Refer to Circuit/System Testing.