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There are many things that can cause this, each will set a fault code in the computer control module of the engine and drivetrain (both are fully electronically controlled). So you must have a fault code test run to read these codes and then diagnose the cause(s)
Hello When the service engine soon light (Also called the check
engine light) is turned on this is to alert you to the fact that
powertrain control module (computer) has detected a failure somewhere
in the systems it controls, this can be the transmission or the
engine or emission system, there are fault codes set in the modules
memory for these faults. What needs to happen now is to have the
powertrain control module scanned with a special tool called an OBD2
electronic engine control scanner or a OBD2 code reader. Once the
code(s) are read then you must perform the diagnostics for each code
and make the appropriate repairs based on the findings of the
diagnosis that was performed, this is called doing "Pinpoint"
Hi, with thse symptoms, the most likely cause is a failed connection or dimmer switch, but the headlight switch is also a possibility. Your dimmer switch is integrated into the control wand. I cannot seem to find the instructions for removing the wand, but I think you remove the clamshell from the column and then unscrew the wand assembly from the column. You can test the switch by leaving the cable attached and back-probing the connector with a 12 volt test light or voltmeter. The light green wire should be hot when the headlights are turned on. Leave it on and then probe the red and purple wires. The purple wire should be hot when the switch is on low beam. The red wire should be hot when the switch is on high beams or flash position. If there is no power on the green wire, the headlight switch has failed or the green wire is disconnected or loose. Please let me know if you have any questions, and thanks for using FixYa.
The relay has nothing to do with the tail lights, but replacing the switch sounds like a good idea. There's a nut holding it in place, see http://www.skandix.de/en/spare-parts/electrics/switches/switch-headlight/1027524/ to get an idea of the construction. And the price. This is not worth fiddling about unreliable workarounds... In addition, if fuses 15 and/or 16 burn frequently there might be a problem with the tail light cabling.
This may be the start of a worse problem that the Impala eventually developes. The Body Control Module has a design flaw along with the Passlock anti-theft system. You may get away with just replacing the BCM for now. It needs to be reprogrammed at the dealer and the car will not start if you replace the BCM without reprogramming it. I would also recommend against replacing it with a remanufactured one. Repair cost is going to be around $500 at the dealer.
If the Passlock system is also at fault, add another $500 for a new ignition switch and cylinder. If you haven't experienced random starting problems yet, they are coming soon. When you turn the key, nothing happens. I thought my 2002 Impala may have been immune to these problems that I've heard about constantly, however, at 90,000 miles, it became "possessed". The symptoms started slowly and got worse. Beside the interior lights flashing like strobs in the middle of the night (while the car was not running), the headlights would occasionally click off and on a few times while I was driving at night.
The relay switch you hear clicking is the Battery Rundown Protection relay. I'm suprised your battery hasn't drained to the point where the car will not start in the morning.