VOLVO
CEM-9F21 - Twilight sensor. Short-circuit to ground
System
Sentral elektronikk (CEM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
5 modellerS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Hva betyr feilkoden?
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.
Mulige årsaker
- Signal wire from the twilight sensor shorted to earth
- The twilight sensor does not work
Hva du kan gjøre
- 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
Symptomer du kan merke1
- The instrument lighting stays on at full brightness all the time
Hva feilen kan påvirke1
- The control module uses the night brightness setting
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