Rheostat Circuit. Open Circuit

Rheostat Circuit. Open Circuit:

Fault symptoms
The lighting controlled by the rheostat is on full continuously. The rheostat does not work.

Conditions
Resistance greater than 20 k ohm generates a diagnostic trouble code.

Diagnostic help
The rheostat and rheostat level can be read using the diagnostics tool. The rheostat should be between 0 V and 3.5 V and the rheostat position should correspond to this.
The rheostat level sent on the bus should be 25-100 % when the headlamps are ON.

Check wiring harness.
Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short-circuits in the leads.
Observe the multimeter, test lamp or diagnostic instrument during the test.