2003 Volvo XC90 Base, FWDFACTORY OEM SERVICE PROCEDURE

System Overview: Signals

The tables below summarize the input and output signals to the units in the system for the alarm. The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication.

REAR ELECTRONIC MODULE (REM) (4/58):

Input signals Output signals
Directly connected:  Directly connected: 
  • Switch in lock unit (3/74) for indicating open driver's door.
  • Switch in lock unit (3/75) for indicating open passenger door.
  • Switch in lock unit (3/76) for indicating open door, left rear.
  • Switch in lock unit (3/77) for indicating open door, right rear.
  • Switch in hood lock (3/62) for indicating open hood.
  • Switch in lock unit (3/78) for indicating open trunk lid/tailgate.
  • Alarm LED (7/12) for indicating alarm status.
  • Inclination Sensor Module alarm (ISM) (7/100), voltage feed (applies to and incl. structure week 201127).
Via serial communication:  Via serial communication: 
  • Inclination Sensor Module alarm (7/100), for information on vehicle's position, or integrated Inclination Sensor in siren (BBS-IS) (from and incl. structure week 201128).
  • Communication with siren (SCM) (16/35) (from and incl. structure week 201128).
  • Inclination Sensor Module alarm (7/100), for status request, or integrated Inclination Sensor in siren (BBS-IS) (from and incl. structure week 201128).
  • Communication with siren (SCM) (16/35) (from and incl. structure week 201128).
Via CAN communication (LS-CAN):  Via CAN communication (LS-CAN): 
  • Reduced alarm switch (3/174) via the climate control module (CCM) (3/112) for deactivation of the inclination sensor module (ISM), the mass movement sensor module (MMS), or ultrasonic sensor module (IMS) (7/199) and deadlock mode.
  • Upper electronic module (UEM) (4/70) for signals from the mass movement sensor module (MMS) or ultrasonic sensor module (IMS) (7/199), siren (SCM) and commands from the remote control.
  • The driver information module (DIM) (5/1) for information about which message is to be displayed.
  • Upper electronic module (UEM) (4/70) for siren (SCM) activation.
  • Central electronic module (CEM) (4/56) for activating direction indicator lamps when the alarm is triggered and the horn during triggered panic function.
UPPER ELECTRONIC MODULE (UEM) (4/70):

Input signals Output signals
Directly connected:  Directly connected: 
 
  • For XC90:(MY-2011)  Mass movement sensor module (MMS) (7/158), rear sensor and mass movement sensor module (MMS) (7/122), front sensor, power supply. The sensors are connected in parallel.
  • For XC90 (MY 2012-):  ultrasonic sensor module (IMS) (7/199).
Via serial communication:  Via serial communication: 
  • For XC90:(MY-2011)  Mass movement sensor module (MMS) (7/158), rear sensor and mass movement sensor module (MMS) (7/122), front sensor. The sensors are connected in parallel.
  • For XC90 (MY 2012-):  ultrasonic sensor module (IMS) (7/199).
  • Communication with siren (SCM) (16/35) (applies to and incl. structure week 201127).
  • For XC90:(MY-2011)  Mass movement sensor module (MMS) (7/158), rear sensor and mass movement sensor module (MMS) (7/122), front sensor. The sensors are connected in parallel.
  • For XC90 (MY 2012-):  ultrasonic sensor module (IMS) (7/199).
  • Communication with siren (SCM) (16/35) (applies to and incl. structure week 201127).
Via CAN communication (LS-CAN):  Via CAN communication (LS-CAN): 
  • Rear electronic module (REM) (4/58) with request for function activation.
  • Rear electronic module (REM) (4/58) with command for siren (SCM) activation.
Factory Service Tools

Use the Manual With the Right Hardware

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

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

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

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

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.