Horn failure / Steering wheel controls partly inoperative
Read the instructions below then start the fault diagnostic procedure.
Symptom: The horn does not work and no DTC is present. Not all steering wheel controls work, no DTC.
| Horn failure / Steering wheel controls partly inoperative |
Fault symptoms
The horn does not work and no DTC is present.Not all steering wheel controls work, no DTC.
Diagnostic help
The horn buttons can be read with the diagnostic tool.The horn outputs can be activated with the diagnostic tool.
The controls (7 (2416 Ω) or 9 (2512 Ω, 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 | ||
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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 Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.This project is supported by memberships and donations. If you use this site, please consider Joining SCNA and/or making a donation.
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