2003 Volvo V70 T-5, StandardFACTORY OEM SERVICE PROCEDURE

Warning lamps

Fig 1: Warning Lamps
GLL106258Courtesy of VOLVO CARS OF NORTH AMERICA.

The brake system uses three warning lamps positioned in the combined instrument panel.

ABS warning lampΒ 

The ABS warning lamp indicates an ABS system fault.

When the ignition is switched on, the ABS control module check the function of the ABS warning lamp. The lamp lights for up to 5 seconds. The ABS control module continuously monitors the system voltage. If the voltage increases or decreases beyond certain parameters the ABS warning lamp lights up and the system goes into standby mode. The lamp goes out when the correct operating system voltage is returned. No diagnostic trouble codes (DTCs) are stored for defective voltage.

Brake warning lampΒ 

The brake warning lamp indicates:

  • faults in the electronic brake force distribution (EBD) function
  • that the brake fluid level is too low.

Traction control warning lamp (only cars with STC/DSTC)Β 

The traction control warning lamp is on continuously when:

  • STC/DSTC is deactivated because a diagnostic trouble code (DTC) is stored
  • STC/DSTC is manually switched off
  • the brake disc temperature is too high.

The traction control warning lamp flashes when:

  • a drive wheel starts to spin during acceleration. The control module is activated to regain traction
  • the lateral stability limit is exceeded (the car oversteers or understeers) during active yaw control.
Factory Service Tools

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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.

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