2011 Volvo XC60 T-6FACTORY OEM SERVICE PROCEDURE

System Overview: Signals

The table below summarizes the input signals to and output signals from the headlamp control module (HCM). The signal types are divided into directly connected signals, serial communication and CAN communication. The illustration below displays the same information with the Volvo component designations.

Input signals Output signals
Directly connected:  Directly connected: 
  • Position sensor (7/119, 7/121)
 -
Via serial communication:  Via serial communication: 
  • Left headlight control unit (LHCU) / right headlight control unit (RHCU)
  • Left headlight control unit (LHCU) / right headlight control unit (RHCU)
Via Controller Area Network (CAN) communication:  Via Controller Area Network (CAN) communication: 
  • Suspension module (SUM) (4/84)
  • Transmission Control Module (TCM) (4/28)
  • Brake control module (BCM) (4/16)
  • Engine control module (ECM) (4/46)
  • Steering Angle Sensor Module (SAS) (3/130)
  • Climate control module (CCM) (4/6)
  • Central electronic module (CEM) (4/56)
  • Driver information module (DIM) (5/1)
  • Climate control module (CCM) (4/6)
GLL179052Courtesy of VOLVO CARS CORPORATION
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.