1998 GMC Jimmy Lights on all the time

Tiny
HEINZ70OI
  • MEMBER
  • 1998 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 93,000 MILES
I bought a repossessed 1998 Jimmy (I know, not a wise move!). Instead of daytime running lights on, all the lights are on - headlights, taillights, dash lights, license plate lights. The headlight switch does not do anything (you can turn it to any position but no change). If you turn the ignition off, the switch functions as it should - off, parking lights, headlights. The previous owner had installed a special white gauge face plate that would adjust with a rheostat switch that was wired into the headlight switch. I removed that (but it did look like he had done it correctly). No difference. I bought another headlight switch but still no difference. Do you think it has something to do with a Daytime Running Lights Relay (if it has one)? Any help would be greatly appreciated! Thanks, John
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Tuesday, February 3rd, 2009 AT 9:27 PM

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Tiny
RACEFAN966
  • EXPERT
Ok it sounds like the body control module may be your problem or it might be set to automatic on the headlights where you then can not turn them off using the switch when the key it on. So we can do some tests on it if you have a digital multi meter and see what it going on if you like. Let me know what you would like to do. Thanks.
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Wednesday, February 4th, 2009 AT 11:06 AM
Tiny
HEINZ70OI
  • MEMBER
Thanks RaceFan966 for answering my question. I don't have a digital multimeter but I will pick one up. So that I understand, is the body control module the unit on the passenger side of the engine compartment and is this the ECM that some people talk about on this site. Also, once I have the meter where should I start?
I'll report back my findings.
Thanks again for your help.
-JHW
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Wednesday, February 4th, 2009 AT 5:50 PM
Tiny
RACEFAN966
  • EXPERT
No the body control module is not the same as the pcm. The BCM controls lighting and gauges and lock and power window's and seats and so on. It is under the dash near the heater box. First call around to your local parts stores and see if one does a free scan and have them scan you truck we are looking for B and 4 number codes this will tell us if the BCM has picked up any problems to help lead to where to start ok. Keep in mind that the last owner may have programmed it to turn the lights on when ever the key is on. Let me know what you find and we will go from there.
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Wednesday, February 4th, 2009 AT 9:37 PM

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