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The chart below summarizes input and output signals to and from the upper electronic module. The signal types are divided into directly connected signals, serial communication and Control area network (CAN) communication. The illustration below displays the same information and the Volvo part numbers.

Input signals	Output signals
Directly connected:	Directly connected: (power supply unless otherwise stated)
Control signal reading lamps (x 4)	Mass movement sensor module (MMS) (7/122) (optional extra), or ultrasonic sensor module (IMS) (7/199) (optional extra)
Remote control (data)	Reading lamps (x 4)
Remote control (frequency)	Roof lighting
Remote control (signal strength)	Cargo compartment lighting
Photo sensor rear view mirror (x 2)	Voltage supply signal EXT.X
	Remote control receiver
	Anti-dazzle for the rear view mirror (optional extra)
	Diodes in the rear view mirror
Via serial communication:	Via serial communication:
Siren (SCM) (16/35) (optional extra)	Siren (optional extra)
Sun roof module (SRM) (optional extra)	Sun roof (optional extra)
Mass movement sensor (MMS) (optional extra) and (7/158) or ultrasonic sensor module (IMS) (7/199)	Movement sensor (optional extra)
Rain sensor (RSM) (7/149) (optional extra)	Rain sensor (RSM) (7/149) (optional extra)
Via Control Area Network (CAN) communication:	Via Control Area Network (CAN) communication:
Central electronic module (CEM) (4/56)	Accessory electronic module (AEM) (4/78) (optional extra)
Driver door module (DDM) (3/126)	Central electronic module (CEM) (4/56)
Engine control module (ECM) (4/46)	Drivers door module (DDM) (3/126)
Carphone module (PHM) (16/60) (optional extra)	Passenger door module (PDM) (3/127)
Steering wheel module	Carphone module PHM (16/60) (optional extra)
	Rear electronic module (REM) (4/58)

Fig 1: Identifying Upper Electronic Module (UEM) Input And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

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.

Safety Warning

System Overview: Signals

Use the Manual With the Right Hardware

When to See a Mechanic