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GM Car Radio Lamps

Discussion in 'Electronic Repair' started by LOP, Dec 6, 2006.

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  1. LOP

    LOP Guest

    The miniature lamps in my 1999 GM Car Radio have burned out. What bulb would
    adequately replace these bulbs? Also it looks like two of the ten bulbs are
    different with maybe a higher intensity.

    Thanks, Don and Liz
     
  2. They have radios that still use lamps and not LEDs???
     
  3. Paul

    Paul Guest

    Yes,
    I had to replace the lamps on my 2000 Pontica Montana radio last year.
    These must be made specifically for GM, because after lots of searching
    I never did find exact replacements. I have no idea if the 1999 radio
    uses ths same lamps, but I ended up removing the remaining good lamp
    and measuring the current draw at 12-14v. I bought a few lamps approx
    the same physical size and current draw, and selected the one that best
    matched the brightness of the original when powered-up. I will see if
    I can find the part number for the lamp that I ended up using. IIRC it
    was a fairly efficient bulb... lots of candlepowers per watt. Don't
    use a higher current bulb to get the brightness where you want it, you
    could blow the driver transistors.
     
  4. D_Zoot

    D_Zoot Guest

    I replace these all the time in GM radios. There are two different
    size bulbs used, depending on the radio model and faceplate. The
    larger one is a T-1 type bulb. I use part #141073 from Jameco
    Electronics as a replacement. The are the same size and so close to
    the same MSCP that you can't really tell. For the micro lamps I find
    that Radio Shack #272-1092 works pretty good. Not quite as bright, but
    the difference is small. The current draw of both lamps is well within
    the capabilities of the lamp driver circuit.


    D
     
  5. Peter

    Peter Guest

    Can you help me with my radio? I have a 1999 Monte Carlo Z34 with about 3
    blown bulbs. How do you change these bulbs and/or remove the radio?

    I'll assume there is no easy way to accomplish this, but since you work on
    these all the time, maybe you can help.
     
  6. D_Zoot

    D_Zoot Guest


    Peter,

    The bulbs are soldered to the board, if you are equipped to deal with
    soldering on a smallish scale read on:

    I don't work at a Chevy garage, so this removal procedure may be a
    little vague, but in a nutshell you have to pull the bezel/trim panel
    off that goes around the instrument cluster, radio and heater controls.
    Usually these panels are just held in place by spring clips and the
    panel should pull straight off. On some applications the bottom of
    the panel tucks in under the panel below the steering column. Once
    you get the panel off, there will be two or three screws holding the
    radio in, after removing the screws the radio pulls straight out.

    Remove any round knobs from the front of the radio by pulling straight
    off. Pop the top and bottom covers off the radio. find two or three
    groups of wires (depending on radio model) coming out from the
    faceplate area and plugging into the boards inside the radio, unplug
    these wires at the connectors on the boards. Carefully release the
    tabs around the perimeter of the faceplate and pull the faceplate
    straight off. Looking at the backside of the faceplate you should see
    a number of screws holding the display and button circuit board to the
    backside of the faceplate. Remove these screws while holding the board
    in place. Put the faceplate face down (this is so all the buttons and
    light tubes don't fall out of it) and remove the circuit board.

    Now you should be looking at all the lamps! If you have more than a
    couple blown, you might want to replace them all while you are there.

    Good luck!
    D
     
  7. Peter

    Peter Guest

    Thanks! I have the stuff to solder tiny components, so I should be all
    set. If I get the time, I'll try this procedure.

    Will the bulb numbers be on the bulbs so I know what to replace them
    with? I deleted the previous message(s) with the bulb numbers and where
    to order them because I wasn't sure if they applied to my brand or not.

    Also, they are incendecent, correct? Another words - no polarity.

    It's a silly question, but figured I'd ask it just in case.

    Thanks again!
     
  8. D_Zoot

    D_Zoot Guest


    No part numbers on the lamps (even if you find a number, it would
    probably be a house number), yup, they are regular incandecent, put
    them in either direction.

    For the larger lamps, T-1 style, I use part #141073 from Jameco
    Electronics as a replacement. The are the same size and so close to
    the same MSCP that you can't really tell. For the micro lamps I find
    that Radio Shack #272-1092 works pretty good. Not quite as bright, but
    the difference is small. The current draw of both lamps is well within

    the capabilities of the lamp driver circuit.


    D
     
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