SAAB WIS ONLINE

P0504

Read the instructions below then start the fault diagnostic procedure.

Symptom: Cruise control inoperative.

P0504


Brake Light/Brake Pedal Switch Plausibility Error

Fault symptoms


• Cruise control inoperative.


On-Board Diagnostics

Type of diagnosis:


- Continuous.


Fault criteria:


- Logical error between the brake light switch and cruise control brake switch for more than 180 seconds.


System reaction to a fault:


- Cruise control is switched off.


OK report:


- Fault criteria not fulfilled.


Check the wiring

A fault in the control module's female connector can generate a DTC. Check the contact for oxidation, dislodge pins and pin clamping force.

Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this. Check switches, connectors and crimp connections for oxidation, dislodged pins and pin clamping force.

Diagnostic help

Diagnostic tool functions related to this fault are:


• Read value:

• Brake pedal switch

• Brake light switch


For more information, see also:

- "Read Values" menu for a description of read values.

- "Activate" menu for a description of applications.