One problem related to wiring has been reported for the 2006 Volvo S40. The most recently reported issues are listed below.
We had been experiencing rain showers on the way to work the Volvo twice had all the lights on the dash board light up but the car did not stall. I was afraid the air bag might deploy. As soon as I got home I had my husband check to see if he could locate the problem. He found was that the carpet was soaked on the drivers side . And the. Wiring running under the carpet was also wet. We have not moved the car and are trying to dry everything. It has also continued to rain off and on. My husband has found some information on the internet which could be related to this problem and will try to see if this might be the solution to our problem.