VOLVO
CEM-1A5F - Communication with the brake control module (BCM). Signal missing
System
Zentralelektronik (CEM)
Volvo-Modelle, für die dieser Fehlercode gilt
Dieser Fehlercode hat je nach Modell, Modelljahr oder Motor unterschiedliche Bedeutungen. Wählen Sie die Bedeutung, die für Ihr Fahrzeug gilt.
Gilt für folgende Modelle:
5 ModelleS60 (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 central electronic module (CEM) has lost the link to the brake control module (BCM) and sets this code. The BCM controls, among other things, the ABS function, so the ABS warning lamp may light and ABS may be lost. The fault lies in the communication, not in the CEM, so the CEM should not be replaced.
Mögliche Ursachen
- The BCM is not getting power
- The ground wire to the BCM is broken
- Contact resistance in the connections
- Broken CAN wiring to the BCM
- Wrong BCM for this car, for example a used module with different software or hardware
- A common CAN network fault if several communication faults are stored at the same time
Was Sie tun können
- 1Switch the ignition on and check that the ABS warning lamp goes out after a moment. If it stays lit, the fault is still present
- 2Check the BCM fuses. If one has blown, replace it once. If it blows again, use a multimeter to check the wire after it has no contact with ground.
- 3Check that the connectors to the BCM are seated and free of corrosion, chafing or damage. Check that the ground wire is tight and clean
- 4Use a multimeter to check that the wires to the BCM have no break. If the fault remains, read the module ID with a diagnostic tool if you have one
- 5Safety: the brake control module affects the brakes, so have a workshop fix the fault promptly and do not work on the brake system yourself.
Symptome, die Sie bemerken können3
- The ABS warning lamp is lit
- ABS function is lost
- A message appears in the display
Was der Fehler beeinflussen kann1
- No ABS function
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.