P0571
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Cruise control not working.
Brake/Cruise Switch. Plausibility Fault
Fault symptoms
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Cruise control not working.
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On-Board Diagnostics
Type of diagnosis:
Enable criteria:
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Battery voltage should be 10.2-15.8 V.
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Vehicle speed has exceeded a speed of 49 km/h and been reduced to 0 km/h 3 times with a deceleration of 1.6 m/s² (somewhat heavy braking).
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Fault criteria:
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Brake light/brake switch signal has not been detected when the above conditions have been fulfilled 3 times.
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Dependents:
System reaction to a fault:
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Cruise control not working.
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OK report:
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When braking is done and the signal of the brake light switch and brake switch cruise control has changed.
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Fault handling:
(See section
Fault handling III, other emissions-related components and functions
for more information)
Diagnostic help
Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.
Functions in the diagnostic tool related to the fault:
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Read value:
Brake Light Switch,
Brake Switch. Cruise Control
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See also description of read value under
"Read Values" menu
for more information.
Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.
