Test results
1
CHECK USING THE EXAMINER
All OK
Problems encountered
Operation
Connect the Examiner to the Body computer and check in active diagnosis that the brake lights are working properly
Go to Step 2
1. The brake lights are not working
2. The third brake light is not working
1. Go to Step 3
2. Go to Step 4
2
CONTROL SWITCH CHECK
Check that the brake switch is working properly
See Test 5550DA BRAKE PEDAL SWITCH OPERATION CHECK
Go to Step 3
Switch broken
Replace the switch
Op. 5550D10 BRAKE LIGHT SWITCH - R+R
3
ELECTRICAL SYSTEM CHECK
Check the continuity of the wiring from the brake switch to the Body computer
Check the continuity of the wiring between the Body Computer and the brake lights
See E2021 BRAKE LIGHTS
Go to Step 5
Wiring interrupted
Restore correct wiring.
4
Check the continuity of the wiring between the brake switch and the third brake light
5
CORRECT OPERATION CHECK
Check that all the brake lights come on
End of diagnosis
Fault persists
Replace the body computer
Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.
N.B.: The side brake lights are activated by the Body Computer Node whilst the third brake light is controlled directly by the brake light switch.