SAAB WIS ONLINE

P1577

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Cruise control not working.

P1577


Brake Light Switch Circuit. Short to Ground.


Fault symptoms


CHECK ENGINE.

Cruise control not working.


On-Board Diagnostics

Type of diagnosis:


- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.


Enable criteria:


- Engine running. Vehicle speed has dropped from 40 km/h to 3 km/h in 2 to 12 s on 5 occasions.


Fault criteria:


- No battery voltage on control module input on any occasion.


Dependents:


- None.


System reaction to a fault:


- Cruise control blocked.


OK report:


- Brake pedal depressed and then released on one occasion.


Fault handling: (See section Fault handling III, other emission-related components and functions for more information.)


- Type III.


Diagnostic help

Fault diagnosis concerns an electrical fault in the connecting leads.

Functions in the diagnostic tool related to the fault:


Diagnostic status for the diagnosis.

Brake light, unit ON/OFF.


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 .