Was bedeutet der Fehlercode CEM-DE70?

Diagnose und Fehlercodedefinition für CEM-DE70 (Volvo C30 (2007–2013), Volvo C30 Electric (2011–2013), Volvo C70 (2006–2013)). Steuergerätereparatur bei OBD Tuning.

VOLVO

CEM-DE70 - Communication with Headlamp Control Module (HCM) Signal Missing

System

Zentralelektronik (CEM)

Volvo-Modelle, für die dieser Fehlercode gilt

Gilt für folgende Modelle:

5 Modelle

C30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)

Modelle nach Baujahr und Motor anzeigen (5)

Was bedeutet der Fehlercode?

The CEM has lost contact with the headlamp control module (HCM), so the headlamps cannot be controlled as normal. The fault is most often caused by supply, earth or a connector at the HCM, or by a broken LS-CAN wire.

Mögliche Ursachen

No supply to the HCM
Open circuit in the earth wire to the HCM
Contact resistance in the connections
Open circuit in the LS-CAN wires to the HCM
The HCM does not suit the car, for example a used module with other software or hardware

Was Sie tun können

1Switch the headlamps on and see whether either one lights. If neither does, the fault is probably the supply or earth to the HCM
2Check the HCM circuit fuse in the engine bay fuse box and in the CEM. If one has blown, check its circuit for a short to earth
3Use a multimeter to check that the supply wire from the CEM to the HCM has no break and is not shorted to earth
4Check the HCM earth point for contact resistance and oxidation
5With a diagnostic tool, read the HCM ID. If it reads, the communication is probably fine and the fault may be intermittent
6Headlamps matter for safety: do not drive in the dark with faulty ones, and have a workshop repair the fault promptly

Symptome, die Sie bemerken können1

The headlamps do not work

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