P0571

2F63 - P0571

Information saved in
DME

Fault code
2F63 - P0571

Fault text
Brake-light switch, plausibility

Fault description
Brake Switch 'A' Circuit

Condition for fault identification
Test condition:
Brake light switch monitor
Depress brake pedal repeatedly
Terminal condition: Terminal 15 ON
Voltage condition:
Voltage in onboard electrical system > 10 V

Condition for fault memory entry
If the BTS is still OK the fault will be registered
immediately when the brake pedal is depressed. If the plug
is disconnected the fault will be registered after
approximately 40 sec.

Action in service
1. Check to determine whether foreign matter or objects
(dirt) are causing the switch to hang.
2. Electrical check on wire
a. --> If not OK, repair wire.
b. --> If OK, replace switch.
3. Check by depresssing the brake pedal repeatedly. No fault
should be stored.

Fault effect and breakdown warning


Driver information
Warning light:
If the switch is defective the cruise control or ACC will be
deactivated.
Display:
None Cruise control is defective
or
None adaptive distance control failure

Service instruction
none