| | Results of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|
| Check
that the heated rear windscreen button in the climate control system
control panel is working properly.In particular, check that the defrosting is activated for both
the rearscreen and the rear view mirrors and that the warning light
on the button in the climate control system control panel comes
on | End of diagnosis | The warning light does not come on | See table K128 |
| The defrosting of the rearscreen only is not activated | See table J21 |
| The defrosting of the door mirrors only is not activated | See table J22 |
| No defrosting is activated | Continue to Step 1 |
| 1 | REARSCREEN RELAY CHECK (POWER CIRCUIT) | All OK | Problems met | Operation |
|---|
| Swap
the heated rear windscreen relay (in the junction unit under the
dashboard) with the relay for the steering column switch unit (they
are next to one another) and check that the defrosting is working
after the swap | Continue to Step 2 | The defrosting function
still does not work even after the swap | Continue to Step 4 |
| 2 | REPLACING STEERING COLUMN SWITCH
UNIT RELAY (POWER CIRCUIT) | All OK | Problems met | Operation |
|---|
| Replace
the steering column switch unit relay (which was actually the one
for the heated rear windscreen) and check that the windscreen wipers are
working properly | End of diagnosis | - | |
| 3 | HEATED REAR WINDSCREEN RELAY POWER
SUPPLY CHECK (POWER CIRCUIT) | All OK | Problems met | Operation |
|---|
| Check
that the rearscreen defrosting relay is correctly supplied by the
battery.With the ignition ON, connect to the power supply for the relay
from the Body Computer and check that the supply is sent to the
relay when the defrosting button is activated. Also check that the electrical connections between the Body Computer,
battery and relay are not faulty See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING  | Do not disconnect the relay |
| Continue to Step 4 | No power supply from the
battery | Restore
the correct power supply to the relay. If necessary, replace the
faulty components (if a fuse is involved, search for the cause of
the problem first) |
| Supply enablement not provided by the Body Computer | Replace the Body Computer Op. 5505A32 |
| Connections faulty | Restore the correct connections. See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING |
| 4 | DEFROSTING CIRCUIT CHECK | All OK | Problems met | Operation |
|---|
| The
problem is due to the simultaneous presence of problems in the rear
view mirror and heated rear windscreen circuits Check that the
connection to earth is correct and the supply for the mirrors and
rearscreen is correctCheck the continuity of the heated rear window demisting heating
elementCheck the continuity and insulation of the circuit See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING | End of diagnosis | Connections faulty | Restore correct connections.
If necessary, replace the faulty components (if a fuse is involved,
search for the causes of the problem first) |
| Rear view mirror faulty | Continue to Step 5 |
| Break in the heated rear windscreen resistance | Replace the heated rear windscreen Op. 7035B14 |
| 5 | REAR VIEW MIRRORS CIRCUIT CHECK | All OK | Problems met | Operation |
|---|
| The
problem is due to the simultaneous presence of problems in the rear
view mirror and heated rear windscreen circuits For both the rear
view mirrors, bear in mind that the problems could be different
for the two mirrors | See table J22 | Fault persists | Search for the
fault starting from another symptom' |
| | Results of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|
| Check
that the heated rear windscreen button in the climate control system
control panel is working properly In particular, check that the defrosting of both the heated rear
windscreen and the rear view mirrors is activated and that the warning
light in the button in the climate control system control panel
comes on | End of diagnosis | The warning light does not come on | See table K128 |
| The defrosting of the heated rear windscreen only is
not activated | See table J21 |
| The defrosting of the door mirrors only is not activated | See table J22 |
| No defrosting is activated | Continue to Step 1 |
| 1 | HEATED REAR WINDSCREEN RELAY CHECK
(POWER CIRCUIT) | All OK | Problems met | Operation |
|---|
| Swap
the heated rear windscreen relay (in the junction unit under the
dashboard) with the steering column switch unit relay (they are
next to one another) and check that the defrosting function is working
properly after the swap | Continue to Step 2 | The defrosting function
still does not work even after the swap | Continue to Step 3 |
| 2 | REPLACING STEERING COLUMN SWITCH
UNIT RELAY (POWER CIRCUIT) | All OK | Problems met | Operation |
|---|
| Replace
the steering column switch unit relay (which was actually the one
for the rearscreen) and check that the windscreen wipers are working properly | End of diagnosis | - | |
| 3 | HEATED REAR WINDSCREEN RELAY POWER
SUPPLY CHECK (POWER CIRCUIT) | All OK | Problems met | Operation |
|---|
| Check
that the heated rear windscreen defrosting relay is correctly supplied
by the batteryWith the ignition ON, connect to the power supply for the relay
from the Body Computer and check that the supply is sent to the
relay when the defrosting button is activated.Also check that the electrical connections between the Body Computer,
battery and relay are not faultyt See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING | Do not disconnect the relay |
| Continue to Step 4 | No power supply from the
battery | Restore
the correct power supply to the relay. If necessary, replace the
faulty components (if a fuse is involved, search for the cause of
the problem first) |
| Supply enablement not provided by the Body Computer | Replace the Body Computer Op. 5505A32 |
| Connections faulty | Restore the correct connections. See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING |
| 4 | DEFROSTING CIRCUIT CHECK | All OK | Problems met | Operation |
|---|
| The
problem is due to the simultaneous presence of problems in the rear
view mirror and heated rear windscreen circuits Check that the
connection to earth is correct and the supply for the mirrors and
rearscreen is correctCheck the continuity of the heated rear window demisting heating
elementCheck the continuity and insulation of the circuit See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING | End of diagnosis | Connections faulty | Restore correct connections.
If necessary, replace the faulty components (if a fuse is involved,
search for the cause of the problem first) |
| Breaks in the heated rear windscreen resistances | Replace the mirror reflector Op. 7005R35 |
| Break in the heated rear windscreen resistance | Replace the heated rear windscreen Op. 7035B14 |