B2371

B2371

Steering wheel controls. Open circuit/Faulty.







Fault symptoms

Steering wheel switch faulty.

Type of diagnosis

Continuous

Enable criteria

Ignition ON

Fault criteria

In case of an open circuit, when the resistance of the circuit is greater than 8 kohm.

In case of a faulty circuit, the resistance of the circuit is outside the normal working range or a button is registered as depressed for more than 5 minutes.

Diagnostic help

The steering wheel controls can be read with the diagnostic tool, showing which button is depressed.

The controls (7 (2416 ohm) or 9 (2512 ohm, Sentronic) resistors in series) are fed with +5 V from the SID. When a button is pressed, the resistor in question is grounded giving a particular voltage.

NOTE: A button has stuck.

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 Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.

Fault diagnosis procedure is not available.