Was bedeutet der Fehlercode CEM-9F21?

Diagnose und Fehlercodedefinition für CEM-9F21 (Volvo S60 (2001–2009), Volvo S80 (1999–2006), Volvo V70 (2000–2008)). Steuergerätereparatur bei OBD Tuning.

VOLVO

CEM-9F21 - Twilight sensor. Short-circuit to ground

System

Zentralelektronik (CEM)

Volvo-Modelle, für die dieser Fehlercode gilt

Gilt für folgende Modelle:

5 Modelle

S60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)

Modelle nach Baujahr und Motor anzeigen (5)

Was bedeutet der Fehlercode?

The twilight sensor gives the central electronic module (CEM) information about the light conditions, which is used to set the brightness of the symbols and the instrument lighting. The fault code is stored when the signal wire from the sensor is shorted to earth.

Mögliche Ursachen

Signal wire from the twilight sensor shorted to earth
The twilight sensor does not work

Was Sie tun können

1Check that the twilight sensor is firmly fitted and clean and undamaged
2With the ignition off, check the wiring and connector to the twilight sensor for chafing, pinching and corrosion
3With the ignition off, use a multimeter to check whether the signal wire has contact with earth (the body); if it does, that is the short circuit
4Remedy the short circuit if it is found and clear the fault code
5If the sensor does not work even though the wiring is intact, it may need replacing; a workshop should do this

Symptome, die Sie bemerken können1

The instrument lighting stays on at full brightness all the time

Was der Fehler beeinflussen kann1

The control module uses the night brightness setting

Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.