B1736

Read the instructions below then start the fault diagnostic procedure.

Symptom: The illumination controlled by the rheostat is at full brightness constantly. Rheostat malfunction.

B1736

Fault symptoms

The illumination controlled by the rheostat is at full brightness constantly. Rheostat malfunction.

Type of diagnosis

Continuous

Preconditions

Ignition ON

Fault criteria

When the resistance of the rheostat circuit is greater than 20 kohm.

Diagnostic help

The rheostat and rheostat value can be read using the diagnostic tool. The working range of the rheostat is 0-3.5 V.

The rheostat value sent on the bus should be 25-100% when the headlights are ON.

Checking the wiring harness

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.