Question about 1988 Cadillac Eldorado

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I need to know where the fuse or why my twilight sentinel stopped working on my 1988 eldorado my manual dont say i also got no information from a Cadillac manual

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It Could Be The DashBoard Switch Itself Or The Light Sensor which is located Near The Bottom Of Your WindshieldOn the dashboard near your GloveBox may be blocked.There are no fuses for this as it runs directly off your Body Control Module which controls all your dash displays and interior lights.

Posted on Aug 04, 2009

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Its a 88 averthing will start going one after all its got some years on it bad grounds soon trunk latch will not close by it self i have 89 eldo and it has started ayear ago

Posted on Jul 26, 2009

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1 Answer

How does the twilight sentinel work


What make ,model an year vehicle ? This is for a Cadillac !
Twilight Sentinel
The twilight delay switch in the headlamp switch assembly is supplied a 5 volt reference from the instrument panel integration module (IPM). The IPM also provides ground to the twilight delay switch. The switch is a potentiometer in which the resistance varies as the switch is moved. The IPM receives an input voltage proportional to the resistance of the potentiometer through the twilight delay signal circuit. The IPM sends a class 2 message to the dash integration module (DIM) indicating the on/off status and delay length for the twilight sentinel. With the twilight sentinel switch in any position other than OFF, the DIM will turn the headlamps on or off according to the daytime/nighttime status sent by the IPM. The DIM uses the twilight delay signal in order to keep the headlamps and park lamps on after the ignition switch transitions from ON to OFF during nighttime conditions.
Now ,do you understand ?
Now

May 30, 2016 | Cars & Trucks

8 Answers

1998 Oldsmobile Aurora Lighting problem-car parked,ignition off,doors locked,unattended,weather normal.parking lights will come on and stay on,by themselves,other times they come and flicker and turn...


sounds like there is a short somewhere. you need to start checking things with a multi meter, could be a bad switch. I would recommend picking up a factory service manual for your vehicle off of ebay. If you need any further assistance let me know.
Thanks,
lee

Aug 02, 2008 | Oldsmobile Aurora Cars & Trucks

1 Answer

Dim head lamps and day light running lamps won't come on my 2000 Buick lasabre


Daytime Running Lamps
With the daytime running lamps (DRL) programmed to be on, the DRL will operate when the ignition switch is in the ON position, the gear selector lever is out of the PARK position, the headlamp switch is in the OFF or PARK position, and the ambient light sensor indicates daytime conditions. Battery positive voltage (B+) is supplied to the DRL relay coil through the underhood fuse block. Battery positive voltage is supplied through the underhood fuse block FOG/DRL Fuse to the DRL relay normally open contact. The DRL relay normally closed contact receives ground for normal high headlamp operation. When the dash integration module (DIM) determines that conditions are right for the DRL, the DIM grounds the DRL relay coil. This energizes the DRL relay coil and closes the switch to the normally open contact. Battery positive voltage (B+) is supplied to the LH and RH high beam headlamps in series. The high beam headlamps split the voltage and each lights at half intensity. Current will follow the path from the DRL relay to the LH high beam headlamp, HDHIBML Fuse, HDHIBMR Fuse, the RH high beam headlamp, then to ground.
Does your vehicle have
Twilight Sentinel
The twilight delay switch in the headlamp switch is supplied a reference voltage from the instrument panel integration module (IPM). It is supplied a reference ground from the IPM. The switch is a potentiometer that resistance varies as the switch is moved. The IPM receives an input voltage proportional to the resistance of the potentiometer. The IPM sends a class 2 message to the dash integration module (DIM) indicating the on/off status and delay length for the twilight sentinel. With the twilight sentinel in an ON position, the DIM will automatically control the headlamps on/off status depending on the nighttime/daytime status of the ambient light sensor. The DIM will use the twilight sentinel delay length to know how long to keep the headlamps and park lamps on after the ignition switch transitions from ON to OFF during nighttime conditions.
If you don't know about these things you best bet is to take it to an ASE certified repair shop or the dealer .
If you
Your best

Nov 30, 2015 | Buick Cars & Trucks

1 Answer

I have a 1999 lumina, the dashboard lights and the parking, running lights are no longer working. I would like to disable the twilight sentinel. How can I do that?


I think the fuses are done. Check your manual or go on internet and find the fuse position of what is not working in the car!
let us know! You need a tool to check fuses! Hope you know how!
good luck!

Sep 23, 2013 | 1999 Chevrolet Lumina

1 Answer

Twilight sentinel will not work; now headlight and tail lights won't come on; interior lights still work with knob. Do you think it is the F-switch? Also, where can I get a schematic of how to ins


It's probably the lighting control module , but without doing some electrical testing that is just a guess !
Battery positive voltage (B+) is applied at all times to the lamp control module (LCM) through the underhood junction block HDLP MaxiFuse® and CKT 1242 (RED).
When you place the headlamp switch in the HEAD position, the headlamps input to the LCM is grounded. The LCM then applies battery positive voltage (B+) through the underhood junction block HDLOBML fuse and HDLOBMR fuse, which feed the left low beam headlamp and the right low beam headlamp respectively. When you activate the headlamp dimmer switch by pulling on the multifunction lever until the switch clicks, CKT 524 (PPL) is grounded to the LCM. The LCM then removes battery positive voltage (B+) from the low beam headlamps and supplies battery positive voltage (B+) through the underhood junction block HDHIBML fuse and HDHIBMR fuse, which feed the left high beam headlamp and the right high beam headlamp respectively.

Twilight Sentinel Circuit Description
Twilight sentinel determines whether the daytime running lamps (DRL), or the exterior lamps and the low beam headlamps at full intensity should be on based upon the signal of the ambient light sensor. When the ambient light sensor detects daytime, the twilight sentinel turns on the DRL. When the ambient light sensor detects darkness, the twilight sentinel turns on the exterior lamps and the low beam headlamps at full intensity. The twilight sentinel also keeps the lamps on for a delay period of 3 to 180 seconds under the following conditions:
• The vehicle is in PARK.
• The ambient light sensor detects darkness.
• The ignition switch is turned to the OFF position.
You may turn off the twilight sentinel manually. When it is dark and the gear selector is in PARK, pushing the twilight sentinel switch to OFF will turn off the headlamps and exterior lamps. Pushing the twilight sentinel switch to OFF again will turn on the headlamps and the exterior lamps. If the gear selector is not in PARK, pushing the twilight sentinel switch will have no effect.
The F- switch is just an input from the LCM - lamp control module .
Do you know how to test control module inputs an outputs ? Very easy to fry a module if you don't know how to do it .
Also have a full scan of all modules on the vehicle , could have DTC'S - diagnostic trouble codes stored . Not for the OBD 2 engine computer . The instrument cluster , BCM , LCM can all set codes too, related to lighting an someother thing's .
ECM Inputs and Outputs Diagnosis

Electric Testing Techniques You Need to Know

You can find free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine ! Under system click on lighting ,then under subsystem click headlamps . Click the search button then the blue link . The first diagram you will see at the top the power supply to the LCM , down a little you will see the headlamp switch , ambient light sensor . Now if you want to start replacing thing's without testing good luck !

Jun 02, 2017 | 1997 Buick Park Avenue

1 Answer

Automatic headlight dont come on at night


It turns out that I had the twilight/sentinel slider all the way to the left , which stopped the lights from coming on automatically. Thank god for this forum because I saw someone mention this silder in another thread and it made me go check the position of mine. I'm sure if I would have taken this to a shop , as I was intending on doing , they would have slid the switch over and charged me for some bogues repair.

So , once again , is well with me , my lights and my BPA

Thanks!

May 07, 2009 | 1995 Buick Park Avenue

1 Answer

Twilight Sentinel on 2002 Cadillac Seville won't work anymore...


Sounds like the problem lies in the TWILIGHT SENTINEL AMPLIFIER unit. Connected with the dash twilight sensitivity panel. All part of the electrical circuitry. Definitely a pricey component. Hope this helps.

May 06, 2009 | 2002 Cadillac Seville

1 Answer

My headlights come on but my taillights have just stop working.But when I press the brake they come on.What do I surpose to do?


Check your fuses first. In a '92 Roadmaster, they would be number 14 and 15, light blue 15A fuses. I am not sure about other years, but your owners manual should tell you. Otherwise it could be the headlight switch, or the Twilight Sentinel Module if your car has the option.
I had a similar problem a few months ago with my '92 Roadmaster Wagon. My problem was due to the Twilight Sentinel Module. If your parking lights do not come on (dash lights, too), but the headlights do when your Twilight Sentinel should turn them all on, try to use the rocker switch to turn on the lights. If the parking lights come on with the rocker switch, I believe you need a Twilight Sentinel Module. However, if you do not have a Twilight Sentinel Module, or your lights do not come on using the rocker switch, you may have a bad switch or faulty wiring. The Twilight Sentinel Module is located way up under the dash, to the right (passenger) side of the steering column where the column goes through the firewall. It looks like the one in the picture, and could be off white or gray, or perhaps a different color.
c304bca.jpg

Jul 15, 2008 | 1992 Buick Roadmaster

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