Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSVOLVO2003S80 T-6REPAIR AND DIAGNOSISDRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESELECTRICAL ACCESSORIES - DESIGN AND FUNCTIONPHONE MODULE (PHM) (1999-2000)SYSTEM OVERVIEWSIGNALS

2003 Volvo S80 T-6

System overview: Signals

2003 Volvo S80 T-6SECTION Signals

The following table summarizes the input signals to and output signals from the phone module (PHM). The signal types are divided into directly connected signals, serial communication and Controller area network (CAN) communication. The following graphic displays the same information with the Volvo component designations.

Input signals	Output signals
Directly connected:	Directly connected: (power supply unless otherwise stated)
Car phone antenna (16/64) (via phone box) Handsfree microphone (16/77) (via phone box) Microphone, handset (16/62).	Car phone antenna (16/64) (via phone box) Handsfree speaker (16/78) Loudspeaker, handset (16/62).
Via serial communication:	Via serial communication:
Phone box (16/66).	Phone box (16/66).
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Central electronic module (CEM) (4/56) Steering wheel module (SWM) (3/130) Driver information module (DIM) (5/1) Anti-lock brake system module (ABS) (4/16).	Central electronic module (CEM) (4/56) Driver information module (DIM) (5/1) Audio module (AUM) (16/1).

Fig 1: Input Signals To And Output Signals From Phone Module (PHM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

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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.