0

Press the brake pedal several times and check that the brake lights are activated correctly each time

End of diagnosis

The fault should not be sought in the switch

The fault persists.

Before replacing the switch, go to step 1 to carry out the fault diagnosis on its operation.

Step

Cursor efficiency check

All OK

Problems encountered

Operation

1

Cut off the switch without disconnecting the electrical connection.

   Op. 5550D10 BRAKE LIGHT SWITCH - R+R

Press the switch cursor manually several times checking that the travel takes place in both directions fully and without obstructions. Check that the brake lights are activated correctly each time.

End of Fault Diagnosis The fault should not be sought in the switch

The lights are not activated correctly.

Go to step 2.

The cursor slides with difficulty and does not reach the end of travel correctly.

Replace the switch.

Step

Signal check

All OK

Problems encountered

Operation

2

• Disconnect the electrical connection from the switch.

Check correctness of the signal by connecting a multimeter to pins 2 and 3 of the switch (see figure)

• Press the cursor manually (brake pedal released condition) and check that the continuity is interrupted.

• Release the cursor (brake pedal pressed condition) and check that there is continuity.

Go to step 3.

Signal interrupted or not correct.

Replace the switch

Step

Signal check

All OK

Problems encountered

Operation

3

Check correctness of the signal by connecting a multimeter to pins 1 and 4 of the switch (see figure):

• Press the cursor manually (brake pedal released condition) and check that there is continuity.

• Release the cursor (brake pedal pressed condition) and check that the continuity is interrupted.

End of diagnosis

The fault should not be sought in the switch

Signal interrupted or not correct.

Replace the switch