Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi I'm Reggie and am glad to help you are u asking for location and or diagnostic assistance just a moment while I access the info,
Okay I went and looked at the wiring and also the failure pattern reports. I believe what Is most likely your problem Wil be a faulty door jamb switch
Do you know where they are? They are in your a pillar where the door closes and Wil push them shut. You can pull them out and check them
Let's do that first unplug them one at a time one of them should make the lights go out
I do not know of a courtesy light timer module. The dome lamps in your csr are controlled by what is called a Central Control Module, this module grounds a relay that turns on dome lamps and it does this using input from door and hatch switchs. The CCM is located behind thr center of your dash about 6 to 8 inches above a relay board it is mounted on a slanted angle and can be hard to see.
1992 Corvette 5.7
Customer Concern:Interior lights stay on and kill the battery.
Average Reported Mileage:71000
Tests/Procedures:1. Remove the interior light relay and see if they go out.2. If so, check the inputs to the Central Control Module (CCM) from the dash switch, hatch switch and the door switches.3. If no inputs requesting the lights on, check the wire from the relay to the CCM for a short to ground holding the relay on.
bare with me Red i am looking
Here is a wiring diagram
more pics of location
Red something interesting look at the diagram i sent you for courtesy lights, and then look at the location pics i sent you you will see a part labeled door ajar diode module, i dont see it in the wiring diagram, it has the right amount of wires..
I believe that is what you are looking for
Red i am about to hop on my fourwheeler and get in the woods i will check back with you later please let me know if this has helped you
Hold on before you do that, Lets talk about this, please dont allow my opinion to frustrate you, I only want to help you.
Your problem is the dome lights staying on, we differ in what we believe may be wrong with it, our other difference is this component you are looking for the courtesy light timer module. I have looked at wiring from Chevrolet, All Data and Pro Demand. I can find no picture or listing of the timer module. I agree sometimes with end year models and changeover you can easily have a car with components that are not listed for that model year. But if you have my wiring diagram, what do you say we just check a couple things, We eliminate the door switchs from the circuit by doing that if your light still stays on, ok you win and i will shut up, but if those lights go off, you sir owe me a cold beer. I feel that strongly one of those is your issue, those switchs are a mechanical moving part, that are used very often in other words they have a life expectancy, the timer and relays seldom fail if they are no shorts or problems created by add ons and such.
Voltage is applied at all times from the CTSY Fuse to Courtesy, Cargo and Spare Tire Lamps. Ground to the Lamps are provided by either the Light Switch or the Courtesy Lamp Relay. The Courtesy Lamp Relay is energized by the Central Control Module (CCM) when either the LH or RH Door is opened.On Coupe models only, ground for the Cargo Lamps is supplied from the Diode Module. They may be turned on by either the Light Switch, Courtesy Lamp Relay or the Hatch Ajar Switch (when the Hatch is open). The Diode Module prevents all of the Courtesy Lamps from turning "ON" when the Hatch is opened, and also from lighting the "Hatch Ajar" Indicator when the Hatch is closed and the Courtesy Lamps are "ON."VANITY MIRRORS/LIGHTED REARVIEW MIRRORVoltage is applied at all times to the Vanity Mirrors and Lighted Rearview Mirror from the Cruise Fuse. Ground is provided by G202. The Lighted Rearview Mirror also receives an Incandescent Dimming Signal (CKT 8), and voltage from the Courtesy Lamp circuit (CKT 40). The Overhead Map Light on the Lighted Rearview Mirror is turned "ON" & "OFF" by an overhead switch at the mirror.GLOVE COMPARTMENTS/CIGAR LIGHTER/UNDERHOOD ENGINE LAMPSVoltage is applied at all times to the Glove Compartment switches/bulbs from the CTSY Fuse. Voltage is applied at all times to the Cigar Lighter from the B CONV PL Fuse which also feeds the console utility plug. Ground for the Glove Compartments and Cigar Lighter is supplied from G202.Voltage is applied at all times to the Underhood Lamps from Fusible Link G through an in-line fuse underhood. Ground is supplied from G115 (LH Lamp) and G116 (RH Lamp). The Underhood Lamp Assemblies contain built-in mercury "gravity" switches that close when the hood is open.
Red that is straight from chevrolet look at it and tell me what you think. Red dont just start dismantling the dash, that is what you got me for, good luck and get back to me
Good morning your statement about the battery drain is even more evidence of a switch failure. When a switch fails even though you pulled out the bulb it is important to note that the switch is sending a false signall to the ccm that a door is open, this will cause the module to never go to sleep causing excessive battery drain. I look forward to hearing back from you after your test
The door jamb switches provide a ground path to module, the best way I know to check them is to undo the connector for each one and see if your lights go out, did you do that? It doesnt take much to send that ground signal i would unplug each one
Red i think after you unplug those switches and your lights are still on, drop the courtesy module and lets go to each input from the switches and make sure the ccm is being told to turn the light on, oh and i wonder if what you are referring to as timer module would be the relay, if it sticks it would keep the lights on, it is over in the relay box but none of my componenet location tells me or shows a picture of which one you would have to go by wire colors if your box doesnt label it, you may want to check that first if you suspect a bad relay swap it out with another one see if problem goes away