Checking contact resistance, oxidation and wiring

HINT: The hands-free microphone is connected to the phone module (PHM) via a connector in the right-hand A-post. 

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.

  Check the hands-free microphone and phone module (PHM) connectors. Check for loose connections. See Loose connections (terminals) .

  Check the cable between phone module (PHM) connector terminal A1 (terminal #1) and hands-free microphone connector H1. Check for an open-circuit. See Open-circuit, intermittent faults .

  Check the cable between phone module (PHM) connector terminal A11 (terminal #11) and hands-free microphone connector H2. Check for an open-circuit. See Open-circuit, intermittent faults .

  Try replacing the hands-free microphone if no fault is found in the wiring.

  Remedy as necessary.

  Other information: 

  • To access or replace the phone module (PHM), see Phone module (PHM), replacing (-2004) 
  • To access and replace the hands-free microphone, see Handsfree equipment, replacing 
  • To connect the breakout box, see Connecting the breakout box, carphone module 
  • For information about signals and connectors, see Signal description, Phone module (PHM) .
  Fig 2: Connector H, Hands-Free Microphone. Only On Cars Manufactured Up To Week 34, 2001 Inclusive

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 3: Identifying Ohm Meter

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 4: Identifying Connector F Terminals

  Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

  It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).