939005166 - Y037 P0380 - PREHEATING UNIT CONTROL (SC TO EARTH)

The diagnostic equipment signals: Error P0380 (Pre-heating unit control), with detail "short circuit to earth"
This error is detected during the diagnosis of the junction unit final stage (short circuit to earth).
0Preliminary checksALL OKPROBLEMS ENCOUNTEREDACTION
Check in the engine compartment junction unit that fuses F20 (the first on the right in the bottom row) and F11 (the third from the right in the bottom row) have not blown.    See B001 JUNCTION UNIT Move on to Step 11. Fuse F20 has blown1. Continue with the    See Test 5505AG CHECK SPARK PLUG HEATING FUSE
2. Fuse F11 has blown2. Replace the engine compartment junction unit    Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.
1Check on operation of heater plugsALL OKPROBLEMS ENCOUNTEREDACTION
Check that the heater plugs are working properly, by carrying out the    See Test 5520CA GLOW PLUGS FUNCTIONAL TESTEnd of diagnosis