System Overview: Signals

2009 Volvo XC70 BaseSECTION Signals

The table below summarizes the input signals to and output signals from the central electronic module (CEM). The signal types are divided into serial communication and controller area network (CAN) communication. No directly connected signals are included in the function.

CENTRAL ELECTRONIC MODULE (CEM) (4/56):

Input signals Output signals
Via serial communication:Β  Via serial communication:Β 
  • Remote Receiver Module (RRX)
  • Remote keyless entry (RKE) (only vehicles with the keyless function)
  • Remote Receiver Module (RRX)
  • Remote keyless entry (RKE) (only vehicles with the keyless function)
Via Controller Area Network (CAN) communication:Β  Via Controller Area Network (CAN) communication:Β 
  • Keyless vehicle module (KVM) (if installed. Signals from the Remote Keyless Entry (RKE))
  • Driver information module (DIM)
  • Keyless vehicle module (KVM) (if installed. Commands to the Remote Keyless Entry (RKE))
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.