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 Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.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