Question about 1992 Lincoln Town Car

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Dim headlight on 92 town car

92 Lincoln town car, the left headlamp went dim. i had high/low but dim. when i pulled the lamp the glass was burnt and one filament was broken. install new lamp same dim response. i get 12 volts on both sides but when i disconnect the right hand lamp the left goes out. anyone got a clue?
thanks,
ed

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Make sure the terminals are clean at the headlamps. check the black wire to ground for open circuit. an open ground will cause a dim headlamp if there is no way to test wire jump the black wire to ground and see if lamp brightens

Posted on Dec 29, 2008

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Why don't lights work?


Both the headlight switch and the BCM provide a ground, or control circuit, to the headlight relay coil circuit for manual or automatic headlamp operation. When you place the headlamp switch in the OFF position, and the ambient light sensor indicates low light conditions, the BCM energizes the headlamp relay for low beam operation. You may switch the headlights to high beam by pulling the dimmer switch handle toward you until the dimmer switch is activated. When the dimmer switch is placed in the HIGH position, the indicator lamp input to the BCM is pulled low. The BCM then sends a class 2 message to the instrument cluster in order to illuminate the high beam indicator lamp.
Low and High Beams Headlamps Inoperative ?
Replace the headlamp switch. Refer to Headlamp Switch Replacement .
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Why wont the headights or running lights work on my 2002 Buick LaSabre?


There are several reasons why your headlamps an running lights don't work , the headlamp switch is a good one ,plus relays an the DIM - dash integrated module an associated wiring ! Here is how the headlamps work , right out of Buick factory service info !
The dash integration module (DIM) provides battery positive voltage to the signal circuits of the headlamp switch. The signal circuits include the headlamp switch headlamps on signal, the flash to pass switch signal and the high beam input. With the headlamp switch in the ON position, a ground path is available for the headlamp switch headlamps on signal circuit of the DIM through the headlamp switch. The DIM provides ground to either the headlamps high beam relay control circuit or the headlamps low beam relay control circuit of the low beam circuit. The position of the headlamp dimmer switch determines which relay control circuit has ground. The DIM supplies battery positive voltage to the relay control circuits, if the headlamps are necessary. The fuse block - underhood supplies battery positive voltage to both relay switch circuits. When the low beam relay control circuit is energized, current flow is to both low beam fuses and to the low beam headlamps. The headlamps have ground at G103 and at G401. When the headlamp high beam relay control circuit is energized, current flow is to both high beam fuses and to the high beam headlamps. The high beam circuit is divided into a left and right side circuit. The current flow of the left high beam is from the fuse to the left high beam lamp. From the lamp, the current flows to the normally-closed contact of the DRL relay to G103. The current flow of the right high beam is from the fuse to the right high beam lamp. From the lamp, the current flow is to ground at G401. When the headlamp dimmer switch lever is pulled toward the driver, the flash-to-pass switch closes. This grounds the DIM flash to pass switch signal circuit. In response to this input, the DIM energizes the HDLP HI BM relay. Both high beams remain on until the driver releases the switch handle. If the low beam headlamps were on during a flash to pass operation, the low beams remain on. The headlights may be switched to high beam with the opposite movement of the headlamp dimmer switch lever.
By running lights , do you mean park lamps or day time running lamps ?
Park, Tail, License and Marker Lamps
The park lamps, including the license lamps, are turned on when the headlamp switch is placed in the PARK or ON position or anytime the headlights are requested. The fuse block - rear supplies battery positive voltage to the switch contacts of the Park LP relay. When the headlamp switch is in PARK or in ON, the park lamp switch on signal circuit of the DIM has a ground path. The DIM provides battery positive voltage to the control circuit of the Park LP relay. When the park lamps and/or the tail lamps are ON, the DIM energizes the park lamp relay control circuit. This closes the switch contacts. Current flows from the Park LP relay to the LH PARK LP and the RH PARK LP fuses. From the fuse, the current flows to the park lamps. The left park lamps are grounded at G103, G401 and G402. The right park lamps and the right tail lamps are grounded at G103 and G401. The DIMR fuse supplies battery positive voltage to the license lamps and to the DIM instrument panel lamp fuse supply voltage - 1 circuit, for interior lamps dimming. The license lamps are grounded at G401.
The best advice I can give is that you take this to a ASE certified professional repair facility unless your a qualified automotive electric repair person !
Diagnostic Starting Point - Lighting Systems
Begin the system diagnosis with the Diagnostic System Check - Lighting Systems . The Diagnostic System Check will provide the following information:
?€¢
The identification of the control modules which command the system


?€¢
The ability of the control modules to communicate through the serial data circuit


?€¢
The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

The

Mar 15, 2015 | 2002 Buick LeSabre

1 Answer

Why doesn't my speedometer/odometer, horn and headlights work?


Which insturment cluster does your's have ? electronic instrument cluster or standard instrument cluster !

Standard insturment cluster - speedo / odometer
Speedometer/Odometer
The speedometer and odometer provides speed information based on a speed/distance pulse signal from the vehicle speed sensor (VSS). The VSS is mounted on the speedometer driven gear in the transmission.
Could be the VSS is bad .
Horn The horn system includes the following:
  • horn relay
  • horn
  • clock spring
  • steering wheel control switch harness
  • steering wheel pad horn switch, which is part of the driver side air bag module. For additional information, refer to Section 501-20B .
The horn is located behind the front bumper mounted to the radiator support.

Is the air bag light lit on the insturment cluster ? If it is the clock spring could be the problem . If not lit check the circuits from the horn relay .

VEHICLE RELAYS Operation Diagnosis .

Which headlamps don't work ? Low beams , high beams , both ?
  • The high beams are inoperative
  • Bulbs.
  • Circuitry.
  • Multifunction switch.
  • GO to Pinpoint Test C .
  • The low beams are inoperative
  • Bulbs.
  • Circuitry.
  • Headlamp switch.
  • Multifunction switch.
  • LCM.
  • GO to Pinpoint Test D .
Principles of Operation
NOTE: Due to varying wattage ratings and resulting current draw, certain aftermarket headlamp bulbs may cause the lighting control module (LCM) to shut down the short circuit protection, resulting in the low beams becoming inoperative. Verify that the headlamp bulbs meet Ford specifications.
Headlamp System The headlamp system consists of:
  • two aerodynamic halogen headlamp bulbs and retainers
  • headlamp switch
  • multifunction switch
  • lighting control module (LCM)
  • circuit wiring and circuit protection
In normal operation:
  • With the multifunction switch in the low beam position, power is supplied by the LCM to the low beam elements through the multifunction switch.
  • With the multifunction switch in the high beam position (forward detent), power is supplied to the high beam elements and to the high beam indicator in the instrument cluster.
  • When the multifunction switch is pulled toward the steering wheel, the flash-to-pass switch (part of the multifunction switch) is closed and power is supplied to the high beam elements. When the switch is released, they return to low beam operation.
  • The battery saver feature of the LCM will automatically turn off the courtesy lamps, demand lamps, headlamps, or parking lamps under the following conditions:
    • The ignition switch is in the OFF position.
    • The headlamp switch is in parking lamps ON or headlamps ON positions.
    • After 10 minutes.
Headlamp Switch The headlamp switch is a multi-position switch.
  • The positions include OFF, PARK, and HEAD.
  • With the headlamp switch in the PARK position (first detent), a signal is supplied to the LCM which powers the front parking lamps, the tail lamps, the side marker lamps, and the license lamp.
  • With the headlamp switch in the HEAD position, power is supplied to the headlamps through the LCM and the multifunction switch.
  • The panel dim switch (part of the headlamp switch) is located above the headlamp switch. The panel dim switch operates only with the parking lamps or headlamps on.
  • When the panel dim switch is held in the up position, the instrument panel lighting will progressively brighten.
  • When the panel dim switch is held in the down position, the instrument panel lighting will progressively dim.
For additional information, refer to Section 413-00 .
Headlamps On Warning Chime If the headlamp switch is left in either the PARK or HEAD position and the driver door is opened, the LCM will sound a headlamps on reminder chime when the following conditions occur:
  • The ignition switch is OFF with the ignition key out.
  • The driver door is ajar.
For additional information, refer to Section 413-09 .

Inspection and Verification
  1. Verify the customer concern by operating the system.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Headlamp switch
  • Central junction box (CJB) fuse(s):
    • 6 (15A)
    • 15 (15A)
    • 21 (15A)
    • 23 (15A)
    • 27 (20A)
  • Battery junction box (BJB) HI-BEAM HEADLIGHTS (20A) fuse
  • Circuitry
  • Headlamp bulb
  • Lighting control module (LCM)
  • Loose or corroded connections

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1 Answer

Oldsmobile intrigue problems


The switch is bad >
Each headlamp is individually fused so that battery voltage is applied to the individual lamps at all times through circuit 1640 for the LH headlamps and through circuit 1740 for the RH headlamps. When the headlamp switch is in HEAD, the ground is applied directly to headlamp switch through circuit 1750. When the headlamp switch is placed in LOW, ground is applied to the low beam headlamps through circuit 1201. When the headlamp switch is placed in HIGH, ground is applied to the high beam lamps and to the high beam indicator through circuit 1200. The high beam indicator is fused so that battery voltage is applied at all times through circuit 640.

The box you hear the click in is the daytime running lights control module .
Do you know how to do electrical testing using a DVOM- digital volt ohm meter or a test light ?

Low and High Beams Headlamps Inoperative
Step
Action
Value(s)
Yes
No
1
Was the headlight system check performed?
--
YES - Go to Step 2
NO - Go to Headlight System Check
2
Does flash to pass function normally in the headlight system check?
--
YES - Go to Step 3
NO - Go to Step 7
3
Does the autolamps low and high beam operate normally?
--
YES - Go to Step 4
NO - Go to Step 6
4
Turn the headlamp switch to the Head position and the headlamp dimmer switch to Low position.
Using a test lamp, backprobe between connector C201 terminal W and ground.
Is the test lamp on?
--
YES - Go to Step 5
NO - Go to Step 6
5
Repair poor connection or open in circuit 1750 between connector C201 terminal W and S283.
Is the repair complete?
--
Go to Headlight System Check
--
6
Replace the headlamp switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle for service procedure.
Is the repair complete?
--
Go to Headlight System Check
7
Repair poor connection or open in circuit 1750 between S283 and ground.
Is the repair complete?
--
Go to Headlight System Check

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1 Answer

My 2002 impala headlights don't work at night or in dark places like a tunnel or under a bridge, they only work in the day time. I have day time runner lights and they automatically turn on when I start my...


You can't turn them on manually with the switch . You have the switch set on auto ?
Headlamps
You can use the headlamps in two different ways.
• Place the headlamp switch in the ON position for normal operation.
• Place the headlamp switch in the OFF position for automatic lamp control (ALC). During ALC the high beam headlamps are On at reduced intensity for daytime running lamp (DRL) operation in daylight conditions, or low beam headlamps On in low light conditions.
The DRL/EXT LTS fuse and the EXT lamps fuse in the underhood junction block supply battery positive voltage at all times to both of low beam lamps and to the right high beam lamp. The low beam circuit continues to the high/low beam switch, then, depending on the position of the dimmer switch, connects to the normally-open headlamp relay switch contacts. Placing the headlamp switch in the HEAD position provides a ground path for the headlamp switch input of the Body Control Module (BCM). After receiving this input, the BCM energizes the headlamp relay. When the headlamp relay is energized, the low beam circuit is connected to ground G201. The high beam circuit is divided into a left and a right side circuit.
The DRL/EXT LTS fuse in the underhood ignition block supplies battery positive voltage to both the coil and to the normally-closed contact of the DRL relay switch circuit. During high beam operation, the left side current flow is through the closed contacts of the DRL relay, and to the left high beam lamp.
The EXT Lamps fuse in the top of the engine fuse block supplies battery positive voltage to the right high beam lamp. Both high beam circuits are then connected together, and continue to the dimmer switch. When the driver closes the high beam contacts of the dimmer switch, the circuit is grounded at G201.
Both the headlight switch and the BCM provide a ground, or control circuit, to the headlight relay coil circuit for manual or automatic headlamp operation. When you place the headlamp switch in the OFF position, and the ambient light sensor indicates low light conditions, the BCM energizes the headlamp relay for low beam operation. You may switch the headlights to high beam by pulling the dimmer switch handle toward you until the dimmer switch is activated. When the dimmer switch is placed in the HIGH position, the indicator lamp input to the BCM is pulled low. The BCM then sends a class 2 message to the instrument cluster in order to illuminate the high beam indicator lamp.
If the headlamp switch is left in the head position, the inadvertent power control feature will turn off the headlights 10 minutes after you turn the ignition switch to the OFF position. If you place the headlamp switch in the head position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until you turn them OFF or until the battery runs dead.

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1 Answer

2002 Dodge Caravan headlamps: one works on dim the other works on high beam but not together. Also only one daytime running lamp.


Your van has dual diligent headlamp bulbs, that means each headlight has one bulb that serves as high beam and low beam. What has most likely happened is on one side the low beam filament has burnt out, and on the other side the high beam filiment has burnt out. The daytime running lights are just the high beam filament running on reduced power, so if the high beam doesn't work on one side, that same side will have no daytime running light. Replace both headlamp bulbs with matching, good quality bulbs.

Mar 06, 2011 | 2002 Dodge Grand Caravan

2 Answers

How do I replace the headlight bulb on a 2005 Town Car?


1. Remove the three pin-type retainers, two screws and the radiator defector.
2. Remove the 4 bolts securing the headlamp assembly and remove headlamp assembly.
- Disconnect electrical connector
3. Remove the 3 hex-head bolts and 2 torx-head screws and remove headlamp protective cover.
4. *****Standard low-beam bulb*****
Disconnect the connector from the bulb and remove the low beam bulb.
5. *****HID low beam bulb*****
Release the spring tabs and remove the HID low beam bulb
Disconnect the connector from the bulb
6. *****High beam bulb*****
Disconnect the electrical connector and remove the high beam bulb.
Reverse order to install
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Jan 27, 2011 | 2005 Lincoln Town Car

1 Answer

Passenger headlight don't work 2003 lincoln navagator


high beam or low beam? or both of them on one side.

  • One low beam headlamp is inoperative
  • Central junction box (CJB) fuse 23 (10A) (RH headlamp).
  • CJB fuse 25 (10A) (LH headlamp).
  • Circuitry.
  • CJB.
  • Go To Pinpoint Test C .


  • One high beam headlamp is inoperative
  • Circuitry.
  • Headlamp assembly.
  • Go To Pinpoint Test D .

  • The high and low beam headlamp is inoperative on one side
  • Circuitry.
  • REPAIR ground circuit 57 (BK).


  • Headlamp switch
  • Multifunction switch
  • Vehicle Security Module
  • Central junction box (CJB) fuse(s):
    • 17 (15A)
    • 23 (10A)
    • 25 (10A)
    • 35 (20A)
    • 40 (20A)
  • Circuitry
  • Headlamp bulbs
  • Daytime running lamp (DRL) relay



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