I have a Volvo S40, which now has developed an intermittent parking / side light problem. When the light switch is in off position (i.e daytime) there is a sound rather like a relay clicking on and off, and the parking / side lights also flash on and off
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Most trailers have three circuits that you'll connect to your vehicle. One operates the taillights, one runs the left brake etc---------------------------------------------------------------------------------- auto diagnostic tools
Yes switch is the problem. Volvo claim they sell very few switches, probably because people bought new cars instead. Problem can be associated with failed ignition coils (2 of) but one does not cause the other but very confusing. Engine fails intermittently or conks out.
Reset battery earth connection on chassis bad design here. Clean off paint and thread also bolt coating. Even better, use brass bolt but do not overtighten. Volvo will try to get you to replace alternator which is not necessary.
Failing battery will light up all the warning lights but will not isolate the battery so if it shorts car will die and not run on alternator. If this happens disconnect battery until you get to garage.
Now you know you can buy an old S40 with confidence great car and very cheap for what you get.
The switch that controls the reverse lights is the PNP switch. It is on the top of the trans under the shift link (where the cable connects to it). These switches do fail frequently, however, there are other things that could cause your problem. Since this switch is a good chunk of change, the problem should be carfully diagnosed before replacing it.
intermittent engine codes are not serious and it just indicates that one or more of the sensors is reporting a bad signal..at what ever time intervals.....this just means that as you drive , bad connections develops as a result of the movement for a second or long enough for the computer to detect a fault and then it goes back to normal....you can check for bad connections yourself by wiggling the wires with engine running and see if the light comes on ..which will tell you where the bad connection is and then fix it yourself or just wait until the connection gets really bad and the engine light stays on permanently .the computer will then store the code thats causing the fault and you'll know exactly where it's coming from.
This is a common problem of Volvo S40. You can try this trick to turn off the flashing arrow light.
1) Turn off Engine
2) Turn key to "On" position (Not start the engine), you will see the panel light will on
3) Step on the break paddle
4) Shift the gear from "P" to "L" 10 times
5) Turn key to " Off" position
6) Now you can start the engine.
7) If doesn't work, you can repeat the procedure.