1985 C4 Hatch Ajar Problem
Thread Starter
Cruising
Joined: Sep 2014
Posts: 13
Likes: 1
From: Lewistown PA
1985 C4 Hatch Ajar Problem
My 1985 Vette doesn't have a hatch ajar switch installed - can't imagine why. I've researched the Shop Manual and Parts Manual and am trying to determine if the wiring and indicator system are working before I go any further.
My 1985 GM Corvette Shop Manual identifies a "Diode Module" installed just prior to the Hatch Ajar switch but I cannot find a description of the module (color-shape-number of wires, etc) or a GM part number from the GM Parts Manual. Without that I can't chase down the part so if any of you know what it is please include it with your reply.
FYI - I tested the diode module with an Ohm Meter but get no reading so I'm assuming it's defective. I also tried grounding each side of the plug that a ajar switch connects to but no hatch ajar light illuminated on the Digital Information Center (DIC). I know the bulb is good so that's not the problem and all but my seat belt warning lights appears to be functional. That's another project once I get this one corrected.
I've studied the associated wiring diagram and will try grounding the "gray" wire leading from the tell tale assembly to the diode module to see if that turns on the light. If it lights the light, the next likely step would be getting a replacement diode module and a functional ajar switch.
If anyone has some personal knowledge about this issue, please reply to my post. Any assistance would be greatly appreciated.
Thanks,
Bill
My 1985 GM Corvette Shop Manual identifies a "Diode Module" installed just prior to the Hatch Ajar switch but I cannot find a description of the module (color-shape-number of wires, etc) or a GM part number from the GM Parts Manual. Without that I can't chase down the part so if any of you know what it is please include it with your reply.
FYI - I tested the diode module with an Ohm Meter but get no reading so I'm assuming it's defective. I also tried grounding each side of the plug that a ajar switch connects to but no hatch ajar light illuminated on the Digital Information Center (DIC). I know the bulb is good so that's not the problem and all but my seat belt warning lights appears to be functional. That's another project once I get this one corrected.
I've studied the associated wiring diagram and will try grounding the "gray" wire leading from the tell tale assembly to the diode module to see if that turns on the light. If it lights the light, the next likely step would be getting a replacement diode module and a functional ajar switch.
If anyone has some personal knowledge about this issue, please reply to my post. Any assistance would be greatly appreciated.
Thanks,
Bill
Drifting
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
My 1985 Vette doesn't have a hatch ajar switch installed - can't imagine why. I've researched the Shop Manual and Parts Manual and am trying to determine if the wiring and indicator system are working before I go any further.
My 1985 GM Corvette Shop Manual identifies a "Diode Module" installed just prior to the Hatch Ajar switch but I cannot find a description of the module (color-shape-number of wires, etc) or a GM part number from the GM Parts Manual. Without that I can't chase down the part so if any of you know what it is please include it with your reply.
FYI - I tested the diode module with an Ohm Meter but get no reading so I'm assuming it's defective. I also tried grounding each side of the plug that a ajar switch connects to but no hatch ajar light illuminated on the Digital Information Center (DIC). I know the bulb is good so that's not the problem and all but my seat belt warning lights appears to be functional. That's another project once I get this one corrected.
I've studied the associated wiring diagram and will try grounding the "gray" wire leading from the tell tale assembly to the diode module to see if that turns on the light. If it lights the light, the next likely step would be getting a replacement diode module and a functional ajar switch.
If anyone has some personal knowledge about this issue, please reply to my post. Any assistance would be greatly appreciated.
Thanks,
Bill
My 1985 GM Corvette Shop Manual identifies a "Diode Module" installed just prior to the Hatch Ajar switch but I cannot find a description of the module (color-shape-number of wires, etc) or a GM part number from the GM Parts Manual. Without that I can't chase down the part so if any of you know what it is please include it with your reply.
FYI - I tested the diode module with an Ohm Meter but get no reading so I'm assuming it's defective. I also tried grounding each side of the plug that a ajar switch connects to but no hatch ajar light illuminated on the Digital Information Center (DIC). I know the bulb is good so that's not the problem and all but my seat belt warning lights appears to be functional. That's another project once I get this one corrected.
I've studied the associated wiring diagram and will try grounding the "gray" wire leading from the tell tale assembly to the diode module to see if that turns on the light. If it lights the light, the next likely step would be getting a replacement diode module and a functional ajar switch.
If anyone has some personal knowledge about this issue, please reply to my post. Any assistance would be greatly appreciated.
Thanks,
Bill
Thread Starter
Cruising
Joined: Sep 2014
Posts: 13
Likes: 1
From: Lewistown PA
Thanks for the info. Can you provide me with an email address or link to Pat at WTB?
Drifting
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
in the WTB section(c4parts for sale/wanted) Pat at See4Parts sold me a nice used one mabey they have another , the thing was a little to pricey for a new one online.
Last edited by xrav22; Sep 17, 2014 at 03:28 PM.
Thread Starter
Cruising
Joined: Sep 2014
Posts: 13
Likes: 1
From: Lewistown PA
I spent 5 hours 2day trouble shooting the problem all of which was to no avail. I can't get the light 2 test no matter whether there's a switch in the system or not so I'm giving up. I really don't need a hatch ajar light anyway. Thanks for your recommendation. I consider this matter closed.
