P1577
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Cruise control not working.
Brake Light Switch Circuit. Short to Ground.
Fault symptoms
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Cruise control not working.
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On-Board Diagnostics
Type of diagnosis:
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Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.
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Enable criteria:
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Engine running. Vehicle speed has dropped from 40 km/h to 3 km/h in 2 to 12 s on 5 occasions.
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Fault criteria:
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No battery voltage on control module input on any occasion.
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Dependents:
System reaction to a fault:
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Cruise control blocked.
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OK report:
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Brake pedal depressed and then released on one occasion.
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Fault handling:
(See section
Fault handling III, other emission-related components and functions
for more information.)
Diagnostic help
Fault diagnosis concerns an electrical fault in the connecting leads.
Functions in the diagnostic tool related to the fault:
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Diagnostic status for the diagnosis.
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Brake light, unit ON/OFF.
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See also the description of readings under
Menu "Read Values"
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.
See
P1576
.
