20 Most Recent 1999 Buick LeSabre Questions & Answers

The unlock code is on the back of the radio. Use an extension mirror to see it.Turn the radio to the on position and press the alphanumerical code in.

1999 Buick... | Answered on Dec 30, 2019

You've probably fixed it by this time, but I'll offer this: There's a microswitch in the ignition lock cylinder. When you insert the key, turn it & go past the run, to start position, the PassKey module wants to see the correct resistance from the pellet in your key. If it matches the pre-programmed value, it will complete the circuit of what is known as a "Wheatstone Bridge " in the module, and allow ignition, cranking & fuel systems to operate. If it doesn't see the correct value, it will shut down for like 5 minutes or something, then reset for the next try. The problem is, that after innumerable cyclings of the key, one of the the two wires will separate internally, disabling the system totally. The two wires exit the lower end of the steering column, & are a very shiny white, and orange in color. They terminate in a connector that can be disconnected. Do that. Then take a measurement between the two exposed wires in that little black pellet on your key, with an ohmmeter & obtain a resistor of the same value. Don't worry about the wattage value of the resistor....a 1/8 watt resistor will work just fine, as there is minimal current in the circuit. Insert the resistor into the two wires that go into the wiring harness (Not the two going up into the steering column). If the microswitch was at fault, your problem is now cured, although your PassKey system is now disabled. The upside is that you can now have spare keys made from the cheap blanks without the resistor in them. Good luck.

1999 Buick... | Answered on Sep 30, 2019

1. CHANGE OIL SOON light will come on when engine oil has broken down enough to require changing. After changing oil, reset oil life display.
2. To reset light, turn ignition on. Open glove box to access oil reset button. Press and hold oil reset button in glove box for at least 5 seconds, but not longer
than 60 seconds. The CHANGE OIL SOON light will flash 4 times to indicate light has been reset.

1999 Buick... | Answered on Feb 24, 2019

If it will not kick down then its a computer fault on the autobox computer but it could have a dirty connection in the engine loom as it has to sense the throttle pedal opening ,try cleaning all the connections and a spray with wd40 on any electrical pin connections

1999 Buick... | Answered on Oct 22, 2018

you may have a shorted starter solenoid, check for 12 volts at the solenoid on the starter...

1999 Buick... | Answered on Sep 29, 2018

I recently tried the DIY service and repair manuals from a website and it actually helped me repair transmission problem in my jcb 3cx site-master. It would'nt move forward or reverse, engine was good both solenoids for forward and reverse worked, but still couldn't diagnose the problem.
I don't have much technical knowledge but I just followed it step-wise, and now it works perfect! covers wiring, codes, diagrams, torque specs, PCV, everything
got it from www.reliable-store.com

1999 Buick... | Answered on Mar 22, 2018

I would be inclined to check the engine to earth strap and battery earth as first before checking wires to alternator and starter motor.

1999 Buick... | Answered on Feb 10, 2018

Bad diodes are a common cause of alternator failure. The diodes are part of the rectifier assembly that converts the alternator's AC output to DC. The alternator's charging output flows through six diodes in the rectifier assembly before it goes to the battery and electrical system.
Some may still be functional but will soon fail and the alternator will need replacing.

1999 Buick... | Answered on Nov 20, 2017

Have a qualified tech do diagnostic's on it !
003 Fuel System Tests Scan Data Tests

1999 Buick... | Answered on Oct 10, 2017

It could be a wiring issue. Are you are using the correct bulb?

1999 Buick... | Answered on Oct 05, 2017

could be a problem starter relay or starter solenoid
if the battery lead goes straight to the starter , pull the starter and have it bench tested

1999 Buick... | Answered on Sep 06, 2017

Here's a quick and easy DIY for cleaning your car's headlight lenses: How to Easily Clean Automobile Headlight Lenses

1999 Buick... | Answered on Aug 27, 2017

The key cylinder sensor may be faulty. if you would like to bypass the system (works only if Passlock security module is ok) follow the link. How To Permanently Disable GM PassLock System

1999 Buick... | Answered on Jul 27, 2017

Hello xxgraffiti87,

Entire TELEPHONE offices have been caught in MUD-SLIDES:
The documented recovery process is to IMMEDIATELY remove all power... Water wash (fire hose) the equipment...

Air pressure clean the equipment and place massive fans while measuring humidity...

Restore power ONLY when humidity is at or below normal.

All that to avoid ELECTROLYSIS...


In addition to the Battery distribution...
you have a GROUND distribution...

If you suspect an OPEN circuit... it is an IDEAL APPLICATION for a wire TONE-TRACER ... (see example below)
(they ONLY work on "open" circuits... You may have to pull a fuse of bulb to PROPERLY trace...
but it can find a multitude of troubles)

BEFORE you get to very exotic about key readers, transponders...
ELECTRONICS (et al).. You need to check your BODY grounds

Lights working/not working is a good sign...

What SHOULD have been done was to
REMOVE ALL POWER... (keep off until totally dry)...
WD40... & compressed air... LOTs.

NOW... you might be able to clean corrosion with commercial corrosion cleaners... Brass bristle brush ... (
try not to remove or further damage the FACTORY SURFACE).

No sloshing or firehoses...

I use white vinegar & Q-Tips... Followed with clean water... then
Isopropyl Alcohol (70% or better)... Lots of AIR...
AIR DRY (for days)... Sparingly apply a anti-oxidant
(again... I first apply WD40... (water displacement)
Clean it all away & apply white lithium grease...

WD40 also sell a WHITE LITHIUM GREASE...
Do not confuse with the WATER DISPLACEMENT PRODUCT...!!

WD 40 Wikipedia

With power applied corrosion/oxidation will grow
quickly & should be easily seen...

Use FREE wiring diagrams to find main ground clusters.
(see below) brass wire, clean & dry all connections...
apply white lithium grease ...
(very sparingly to any visible corrosion)

Sealed units (like headlight relays... You have a BUNCH)
You might want to consider going to a wreaking yard with
a picnic basket...

If they got submerged... it is HIGHLY LIKELY they are STILL MOIST (inside)... and will only get worse.

FREE drawings... (and Tech Bulletins) at
BBB Industries website (registration required)
BBB Industries Premium Alternators Starters Power Steering Products

Extech TG20 Wire Tracer and Tone Generator Amazon com

Hope this helps.

Carnac the Magnificent

1999 Buick... | Answered on Jul 20, 2017

disconnecting the battery may reset it

1999 Buick... | Answered on Jul 17, 2017

The drain runs behind the front door pillars. It can get clogged with leaves and debris. The usual corrective action is to ream it out with a coat hanger (straightened, of course) with a small hook on one end.

1999 Buick... | Answered on May 28, 2017

computer needs to be program ...

1999 Buick... | Answered on May 15, 2017

take you car to autozone and let them check the battery and stuff and tell them to do a load test and post it on here

1999 Buick... | Answered on Mar 30, 2017

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