jmjp5055 Posted September 12, 2018 Report Share Posted September 12, 2018 Was a time working under the dash didnât require a masters degree in bulb replacement jman093 and primergray 2 Quote Link to comment Share on other sites More sharing options...
jmjp5055 Posted September 12, 2018 Author Report Share Posted September 12, 2018 Under the hood easy  jiggity76 1 Quote Link to comment Share on other sites More sharing options...
jiggity76 Posted September 13, 2018 Report Share Posted September 13, 2018 Looks nice, can I just switch out the bulbs or is there a lot of wiring involved. Not very good with wiring. Here's what mine looks like with the stock bulbs. It's ok. jmjp5055 1 Quote Link to comment Share on other sites More sharing options...
jmjp5055 Posted September 13, 2018 Author Report Share Posted September 13, 2018 No wiring involved, changing out the bulbs is easy but getting to some of them you need an engineering degree Quote Link to comment Share on other sites More sharing options...
jiggity76 Posted September 13, 2018 Report Share Posted September 13, 2018 2 hours ago, jmjp5055 said: No wiring involved, changing out the bulbs is easy but getting to some of them you need an engineering degree That's great, thanks. Our cars are twinsies, well mine's a coupe, a 91, but white with red interior, so maybe not but close enough! jmjp5055 1 Quote Link to comment Share on other sites More sharing options...
crazyd Posted September 18, 2018 Report Share Posted September 18, 2018 I've had my share of backfeed weirdness from changing them out. Right now I just discovered that my front marker lights are coming on when I hit the brakes, and the left turn signal stops flashing also when I hit the brakes. I did the ones in the cluster, and all the backlights were fine but when I did the warning lamps they were on at a low glow when the headlights and markers were on.  Had to go back to incandescents for all the warning indicators but kept the CHECK GAGES, turn signals, low fuel warning and HI beams as LED. I'll still have to undo some more, because something in the brake circuit is backfeeding. I would check everything in the dark, preferably with a helper while you hit the brakes, before you put it all back together and call it good. I also found out the hard way that replacing the CHMSL bulbs will freak out the ABS computer. jmjp5055 1 Quote Link to comment Share on other sites More sharing options...
Imp558 Posted September 18, 2018 Report Share Posted September 18, 2018 LEDs are nice but our cars have some bulbs that illuminate opposite polarity at different times. Since an LED is a Diode current can only flow one directionand things get weird. jmjp5055 1 Quote Link to comment Share on other sites More sharing options...
jmjp5055 Posted September 18, 2018 Author Report Share Posted September 18, 2018 I think I was told the flasher for turn signals needed to be replaced if led is used as the turn signals/flasher do not draw enough power from those bulbs.  Quote Link to comment Share on other sites More sharing options...
jmjp5055 Posted September 18, 2018 Author Report Share Posted September 18, 2018 Also been seeing the term switch back led not sure what that means Quote Link to comment Share on other sites More sharing options...
runt Posted September 25, 2018 Report Share Posted September 25, 2018 Switchback is an LED that, in the instance of a turn signal bulb, is white when it is on and yellow when it flashes. Pretty neat stuff, really. Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted September 27, 2018 Report Share Posted September 27, 2018 On 9/18/2018 at 1:38 AM, crazyd said: Â I also found out the hard way that replacing the CHMSL bulbs will freak out the ABS computer. I've had an abs code with the factory bulbs before because they were making poor contact due to the sun expanding the connector cavity on the CHMSL. Once I fixed that, no more abs light/fault. Quote Link to comment Share on other sites More sharing options...
Imp558 Posted September 27, 2018 Report Share Posted September 27, 2018 If something acts up with LEDs it's easy eenough to wire some resistors in parallel with them to match the current draw, futile because that undermines the efficiency of going LED so an electronic flasher is a better plan. Some of the bulbs in the front will misbehave, as I said before because there are conditions where they work opposite polarity. My fix was to substitute the bulb with a little Omron relay to turn the LEDs on. LEDs do not "backfeed", in circuits where that seems to be the problem it's actually lack of "backfeed" -or- inability to flow both directions rather. Quote Link to comment Share on other sites More sharing options...
jmjp5055 Posted September 29, 2018 Author Report Share Posted September 29, 2018 Update changed out high mout brake lights from halogen to led wasnât that difficult , Iâm posting pics, hardest part have to file a 1/2 mm. Notch, on top and bottom of light port, also replaced O rings   Quote Link to comment Share on other sites More sharing options...
James Robert Posted October 10, 2018 Report Share Posted October 10, 2018 (edited) On â9â/â27â/â2018 at 1:42 AM, mfewtrail said: I've had an abs code with the factory bulbs before because they were making poor contact due to the sun expanding the connector cavity on the CHMSL. Once I fixed that, no more abs light/fault. I have an ABS light on in my CS. Found two burned out bulbs and one missing entirely in the CHMSL. Fixed that but ABS light is still on. I could have the same problem you have. How did you know the bulbs were making poor contact? Did they not come on? Edited October 10, 2018 by James Robert more clear Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted October 11, 2018 Report Share Posted October 11, 2018 12 hours ago, James Robert said: I have an ABS light on in my CS. Found two burned out bulbs and one missing entirely in the CHMSL. Fixed that but ABS light is still on. I could have the same problem you have. How did you know the bulbs were making poor contact? Did they not come on? If your CHMSL brake lamps actually light-up, you shouldn't have the same issue I did. Quote Link to comment Share on other sites More sharing options...
James Robert Posted October 11, 2018 Report Share Posted October 11, 2018 7 hours ago, mfewtrail said: If your CHMSL brake lamps actually light-up, you shouldn't have the same issue I did. OK, thanks. They do all light now. I just thought yours may have been an intermittent issue. The GM dealer wants $150 to scan for ABS codes. I'm thinking about just buying the scan tool and the adapter cable. Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted October 12, 2018 Report Share Posted October 12, 2018 (edited) 15 hours ago, James Robert said: OK, thanks. They do all light now. I just thought yours may have been an intermittent issue. The GM dealer wants $150 to scan for ABS codes. I'm thinking about just buying the scan tool and the adapter cable. Keep an eye out on ebay for an OTC ABS Reader - part # 3757 or 3758. Both include the scan tool, just one part number denotes that the tool comes with a case if I recall correctly.  https://www.ebay.com/itm/OTC-3758-SPX-OTC-ANTI-LOCK-BRAKE-SYSTEM-SCAN-TOOL-Reader/163057194606?epid=1722255754  That one doesn't appear to have any cable adapters, so you'll need OTC # 212633 gm adapter - about $10 shipped on ebay. All together, you could have the tool for half of what GM wants to scan it. Edited October 12, 2018 by mfewtrail Quote Link to comment Share on other sites More sharing options...
James Robert Posted October 12, 2018 Report Share Posted October 12, 2018 6 hours ago, mfewtrail said: Keep an eye out on ebay for an OTC ABS Reader - part # 3757 or 3758. Both include the scan tool, just one part number denotes that the tool comes with a case if I recall correctly.  https://www.ebay.com/itm/OTC-3758-SPX-OTC-ANTI-LOCK-BRAKE-SYSTEM-SCAN-TOOL-Reader/163057194606?epid=1722255754  That one doesn't appear to have any cable adapters, so you'll need OTC # 212633 gm adapter - about $10 shipped on ebay. All together, you could have the tool for half of what GM wants to scan it. Tempting. I'm still confused on which OBD I have in my '95. I have a 12 pin plug mounted on the lower dash, with only two wires going into it, but hanging free under the dash I also found a 16 plug connector. Does that make a difference? Quote Link to comment Share on other sites More sharing options...
crazyd Posted October 13, 2018 Report Share Posted October 13, 2018 '95s were OBD1.5. Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted October 13, 2018 Report Share Posted October 13, 2018 (edited) On 10/12/2018 at 12:38 PM, James Robert said: Tempting. I'm still confused on which OBD I have in my '95. I have a 12 pin plug mounted on the lower dash, with only two wires going into it, but hanging free under the dash I also found a 16 plug connector. Does that make a difference? It doesn't make a difference to that OTC tool I linked to. It will read 94-95 w-bodies and pre-94 with the same cable adapter.  edit: I read over this quickly Saturday and somehow missed the part about both data connectors. I probably just assumed you didn't know if a OBD-1 scan tool would work on a 94-95 because people like to call them "obd 1.5." I said they would read either with the same cable because "1.5" w-bodies should have the 12 pin connector standard. I don't recall ever seeing a 16 pin connector in a 95. Maybe your car is a transitional period 95 or either someone added it like Imp558 suggested. Are you certain you have a 1995? What's the build date on the car? Edited October 15, 2018 by mfewtrail Quote Link to comment Share on other sites More sharing options...
Imp558 Posted October 15, 2018 Report Share Posted October 15, 2018 I'm having trouble wrapping my head around it having both DLC's.. Somebody must have done an OBD-II conversion to it at some point? Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted October 15, 2018 Report Share Posted October 15, 2018 Replying to let you know I edited my post above(not sure we receive reply notifications for edited posts). Going back through old posts on the site, it appears others with 95's have had the 16 pin style connector as well. I however did not see anyone posting about having both connectors though which leads me to believe that was added by someone. I'm not sure what to tell you about that OTC scan tool now unless the OBD-II adapter cables will work for it. I have an OBD-II adapter cable for my OTC tool, but I don't know it it came with my ABS reader or my "mind reader" powertrain scan tool. The cable adapter has a port where it looks like it would take jumper keys or something similar to the ones older snap-on tools used. I didn't receive any keys with it and it's hard to find any documentation online for these old ass tools. Quote Link to comment Share on other sites More sharing options...
GTP091 Posted October 15, 2018 Report Share Posted October 15, 2018 I had LED all over in my GTP.  Years later itâs back to oem.  One by one they either quit, acted weird or had poor connections in the socket. Hopefully you will have better luck than I did. In the end it wasnât worth the effort or expense from my experience. I much prefer the colour temp to incandescent as well.  I only still have LED low beam headlights which so far are doing well. Quote Link to comment Share on other sites More sharing options...
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