Checking The Connectors

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS CORPORATION

Fig 2: Connecting Connector

Courtesy of VOLVO CARS CORPORATION

• Ignition off
• Check the fuel pump (FP) and the control module connectors. Check for contact resistance and oxidation and remedy.

  Check for damage carefully

• Reinstall the components, reconnect the connectors etc.
• Ignition on.
  NOTE:

  It is important that only the ignition is on in order for the heater to start.

• Activate the heater.

  A buzzing sound should be heard from the heater.

  Check the function of the heater. See ENGINE COOLANT HEATER, TEST RUNNING .

  If the heater now functions, the cause of the fault was loose connections in the connectors.

  Other information: 

  • To access the control module or connect the breakout box, see CONNECTING THE BREAKOUT BOX
  • To access or replace the fuel pump (FP), see FUEL PUMP AUXILIARY HEATER, REPLACING
  • For other values, see SIGNAL SPECIFICATION
  • see CHECKING WIRING AND TERMINALS .
  Fig 3: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS CORPORATION

Does the heater operate? 

• YES 

  OKAY:  Troubleshooting has been completed.

• NO 

  Refer to CHECKING THE OVERHEAT PROTECTION THERMOSTAT