Question about 1999 Lincoln Town Car

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Headlamps flicker when hitting bumps. Notice it more on right side. Lamp ground to body is good. Connector pins to lamp are good. Adjusted headlamps, changed bulb, still have problem. No flicker noticed in dash lights. Seems like a headlamp housing or bulb is loose type problem(flicker). Lamps do not go out. looks like the light shakes might be a better definition.

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  • Lincoln Master
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Yes i agree, what you have done is what i would have been telling you to check so well done for saving you and me time.first its either one of what you say but its my guiss the headlamp housing is loose after what you have all ready done i think you will find the culpuit quick,TIP,if you find the housing loose try using cable ties they work a treat without haveing to use screws ,any problems dont be afraid to come back to me,adrian,,,,,,,,

Posted on Aug 20, 2010

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Headlamps on, both brake lamps are on;hit brake, left brake lamp brightens, right lamp remains dim;headlamps off, hit brake, only left lamp lights. What could be the problem?


Your right brake light is not the same bulb as your rear running light that comes on with the headlights. Different bulbs. Your right brake light is simply burnt out or has worked its way out of the connection. Take it to Advance Auto Parts. They may even change it for you. Not a big problem.

Jul 02, 2017 | Cars & Trucks

1 Answer

Changing backup bulbs on 2005 buick rendevous


TAIL LAMP ASSEMBLY AND /OR BACKUP, SIDEMARKER, STOP, TURN SIGNAL BULB REPLACEMENT

REMOVAL PROCEDURE

1. Open the liftgate.
2. Remove the screws from the tail amp.
3. Slide the tail lamp rearward in order to disengage it from the retainers on the rear body panel.
4. Disconnect the electrical connector from the tail lamp wiring harness.
5. Remove the tail lamp and side marker lamp sockets from the tail lamp, depressing the locking tab and turning counterclockwise.
6. Remove the bulbs from the tail lamp and the side marker lamp sockets, if replacing the bulbs.

INSTALLATION PROCEDURE

1. Install the bulbs to the tail lamp and side marker lamp sockets, if removed.
2. Install the tail lamp and side marker lamp sockets to the tail lamp, turning clockwise until the locking tab is fully seated.
3. Connect the tail lamp electrical connector to the wiring harness.
4. Position the tail lamp retainer slots to the tabs on the rear body panel.
5. Install the tail lamp to the rear body panel, pressing into place until fully seated.
6. Install the tail lamp screws to the Taillamp.

NOTE: Refer to Fastener Notice in Service Precautions.

Tighten the tail lamp screws to 2 N.m (18 lb in).

7. Close the liftgate.

Apr 16, 2017 | Buick Cars & Trucks

1 Answer

2012 Chevy Silverado low beam light not working.


Regular headlamps or HID ? Check the HDLP LO/HID relay in the under hood fuse / relay box . Will be marked on the inside of the lid . Do you know what a BCM is ? body control module. Could have DTC'S - diagnostic trouble codes stored .
DTC 2575 00: Headlamp Low Beam Control Circuit
  1. Ignition OFF, disconnect the low beam relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
  3. ?‡'
    If the test lamp illuminates, test the control circuit for a short to voltage.

  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
  5. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

  6. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
  7. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

  8. Ignition OFF, disconnect the harness connector at the inoperative low beam headlamp.
  9. Ignition OFF, scan tool OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal B and ground.
  10. ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

  11. Connect the harness connector at the inoperative low beam headlamp.
  12. Connect a 40A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the low beam headlamps are activated.
  13. ?‡'
    If the low beam headlamps do not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the inoperative low beam headlamp.

  14. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  15. Command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  16. ?‡'
    If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.


    ?‡'
    If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  17. If all circuits test normal, test or replace the low beam relay.

May 25, 2016 | Cars & Trucks

1 Answer

No low beam. Good high beam. No day lights. What's wrong?


No on the fuse . The LH HDLP and RH HDLP fuse in the fuse block - under hood, supply battery positive voltage to both low and high beam lamps at all times. For manual operation, when the headlamp switch is in the ON position, the headlamp switch supplies ground directly to the headlamps and to the body control module (BCM) on the headlamp low or high beam signal circuit, depending on the position of the headlamp dimmer switch. The BCM uses this signal to determine if the conditions are present to illuminate the daytime running lamps or park lamps.
The headlamps may be turned on 2 different ways. First, when the driver places the headlamp switch in the ON position, for manual operation. Second, with the headlamp switch placed in the OFF position activating automatic lamp control (ALC).For ALC operation, the BCM receives a signal from the ambient light sensor indicating a low or high ambient, outside, light level. Under low light conditions the BCM grounds the headlamp relay control circuit energizing the headlamp control relay. The now closed relay supplies ground through the headlamp switch to the headlamps and the BCM on the headlamp low or high beam signal circuit, depending on the position of the headlamp dimmer switch. When the BCM grounds the headlamp relay control circuit it also grounds the park lamp relay control circuit illuminating the park lamps. The headlamp relay is grounded at G203.
Daytime Running Lamps (DRL)
The low beam headlamps operate at reduced intensity when in daytime running lamps (DRL) mode. The ground circuit to the switch side of the DRL relay has a resistor in-line to reduce the intensity of the low beam headlamps for DRL operation. The body control module (BCM) receives a signal from the ambient light sensor indicating a low or high ambient, outside, light level. Under daylight conditions the BCM grounds the DRL relay control circuit energizing the DRL control relay. The now closed relay supplies ground directly to the low beam headlamps and to the BCM on the headlamp low beam signal circuit. The low beam headlamps now illuminate with reduced intensity. The DRL relay is grounded at G203. Any time the headlamps are illuminated the DRL will not illuminate. Manual park lamps do not effect DRL operation.

Feb 23, 2016 | 2005 Chevrolet Equinox LS

1 Answer

Were is headlight low beam relay


It is located in the under hood fuse/relay box . It's non -replaceable ,if bad whole fuse box has to be replaced ! The low beam headlamps may be turned ON in 3 different ways:
?€¢
When the headlamp switch in the HEAD position for normal operations


?€¢
When the headlamp switch is in the AUTO position, for automatic lamp control (ALC)


?€¢
When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delay

Battery voltage is applied at all times to the coil and switch sides of the LOW BEAM PCB Relay located in the underhood fuse block. When the headlamp switch is placed in the HEAD position, ground from G202 is applied through headlamps ON switch signal circuit to the body control module (BCM), signaling the headlamps ON request. In response to this signal, the BCM applies ground through the headlamp low beam relay control circuit energizing the low beam relay. With the relay energized, battery voltage is applied through the switch side of the relay, the left and right low beam fuses, and the low beam supply voltage circuits illuminating the low beam headlamps. Ground for the left headlamp is provided at G101 and the right headlamp at G100.
Low Beam Relay Test

  1. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
  2. Connect a test lamp between the control circuit terminal A5 and B+.
  3. Ignition ON, command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  4. ?‡'
    If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.


    ?‡'
    If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  5. If all circuits test normal, replace the underhood fuse block.
  6. Ignition OFF, disconnect the harness connector at the inoperative low beam headlamp. Test for less than 5.0 ohms between the ground circuit terminal B and ground.
    ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

    Connect a test lamp between the supply voltage circuit terminal A and ground. Ignition ON, command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    ?‡'
    If the test lamp is always ON, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.


    ?‡'
    If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.

    If all circuits test normal, test or replace the low beam headlamp.

Jun 10, 2015 | 2006 Chevrolet Chevrolet Impala LS

1 Answer

My fog lights won't turn on Nissan sentra GEX 2002


There are several things that can cause your fog lamps to not work. The fog lamp circuits need to be diagnosed. Your entire fog lamp circuit can be tested at the plug for the fog lamp relay located n the relay box.

PIN 5 on the relay should have battery power at all times. This power comes from Fuse #43 (15 Amp) in the fuse and fusible link box in the engine compartment. If there is power at this pin, the fuse and the circuit between the fuse and the relay is good.

PIN 3 on the relay goes to the fog lamp bulbs. There should be continuity to ground through the bulbs on this pin. If you have continuity to ground, connecting a jumper wire between PIN 5 and PIN 3 should make the fog lamps come on unless there is a short circuit to ground, which will cause Fuse #43 to blow. If there is no continuity to ground on this pin, the problem is either that BOTH fog lamp bulbs are burned out or there is a break in the wire between the relay and the bulbs.

PIN 1 Is the battery power for the primary coil in the relay. This power comes from the headlamp switch and power is only supposed to be present here when the headlamps are on and the dimmer switch is on LOW BEAM. If power is not present at this pin, the problem is a bad headlamp switch or an open circuit between the headlamp switch and the relay.

PIN 2 Is the control circuit for the primary relay coil. The control circuit should have continuity to ground when the fog lamp switch is set to the ON position. If there is no continuity to ground with the fog lamp switch on, the problem is a faulty fog lamp switch, an open between the relay and the fog lamp switch, or an open between the fog lamp switch and ground E37 (right front of engine compartment) and ground F7 (left rear of engine compartment) Please note: This circuit has redundant grounds....if one ground is not making good contact, the other ground can still make the circuit work.

PIN 4 on the relay is not used.

If all of the circuits/pins are working as described above, replace the relay.

That is pretty much it... That is all you really need to know to get your fog lamp circuits diagnosed. Let me know if you need further assistance.

May 13, 2012 | 2002 Nissan Sentra

1 Answer

Brakes lights work but tail lights do not work or front running light do not work


Your Tail Lamp/Park Lamp system is pretty easy to check. ayou can check to see which part of the system is failing by checking for power and ground at the socket for the tail lamp relay. The tail lamp relay is located in the driver's side junction box under the left side of the dash. It is the relay that is second from the bottom at the far left.
To check the circuits, you just need a 12 volt test light. Remove the relay and do the following tests:
Connect one end of the test lamp to the battery NEGATIVE post. with the other end probe pins 1 and 5 of the relay connector. Both of these pins should have power (light your test light) at all times. If they do not, or if one is hot and the other one is not, the problem is most likely in the junction block itself.

Switch your test lamp lead from the battery negative terminal to the battery POSITIVE terminal.
Probe pin 3. Your test lamp should light, but may be a little dim. This is the circuit through your tail and park lamps to ground. Your park lamps should also light dimly when you do this. If the light does not light at all, then you need to check for a blown fuse at the 10 Amp "TAIL" fuse located inside the drivers side kick panel fuse block. If this fuse is blown, you will need to trace your tail and park lamp circuits to find out where they are shorting.

With your test lamp still connected to battery positive, probe pin 2 at the relay connector. This connector should not do anything until the headlamp (combination) switch is turned on. When it is turned on, your test lamp should light. I am not absolutely certain, but you MAY have to turn the ignition switch on to get this to work. This circuit is actually grounded by the body control computer, and the service manual does not say if it will work without the ignition on. If your test lamp does not light with the light switch turned on and the ignition switch on, then the problem is either the light switch, the body computer, or the wiring in between them. You will need a scan tool that can read live data from the body computer to find out if the body computer is receiving the signal from the headlamp switch. If you have not located the cause of the problem at this point, I would recommend getting with somebody that has the proper equipment to diagnose your computer system.

Good luck,

Dave

Sep 26, 2011 | 2002 Toyota Camry

1 Answer

My passenger side headlight is not working with wire and connector connected to it could this be the connector its self?


get a test light and check plug (connector) to headlamp. one hi beam , one low beam and ground. if they light , lamp is bad, if the test light is confusing just switch headlamps from side to side and see if the lamp that does work works on other side or plug.

Jan 10, 2011 | Volkswagen GTI Cars & Trucks

1 Answer

Headlamps not working, fuses o.k., bulbs ok, replaced switch ok 98 chevy cavalier w/ daytime running lights . 2 relays on harness between headlamps one is for fog lamps, not sure of the other , cannot get...


are your daytime running lamps working. if they are according to the schematic there are 4 relays, fog lamp, fog lamp cut off, isolation, and daytime running lamp; 2 fuses: right and left, that supply volts to the headlamps. it's a little confusing though, because these schematics might have some mistakes. anyway, it looks like the drl relay.grounds the headlamps when the drl control in the micro processor located in the instrument cluster senses the headlamps have been turned on. this trips the relay and 12vdc is supplied. the dlr might be bad. otherwise, i would think you have a hardwire or connector problem.

Mar 08, 2010 | 1998 Chevrolet Cavalier

1 Answer

Flickering headlights


Check the wiring, headlamp switch, and dimmer switch. Also very likely a loose connector to the lamp itself, or a lousy ground. Try to replicate the problem by bouncing the assembly by hand, with the headlamps on. If power flickers, then you have the loose connector/ground problem. If not, you may have an intermittent short in the wiring itself.
Also, are both headlamps flickering? Or just one? If it's both, then your dimmer switch/headlamp switch are likely to be at fault. If it's only one, check the wiring.

Aug 02, 2008 | 1988 Nissan 300ZX

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