Question about 1998 Mercury Grand Marquis

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Hazards, turn signal lights and brake lights do not come on. the lights come on only if the headlight switch is on but does not flash when applying the turn signal. The high mount brake light works but not the brake lights when the headlights are on.

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Sounds like a switch problem m8 get wiring diagram and fuse link the feed and output to indicators alone see if they work ok if so its the switch

Posted on Apr 27, 2010

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Posted on Jan 02, 2017

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All my lights work on my 2005 ford focus except the lower brake lights and turn signals. all fuses are good.


Do you know anything about automotive electronics ?
Stoplamps
The stoplamps are part of the rear lamp assembly. When the brake pedal is applied, the stoplamp switch supplies voltage to the generic electronic module (GEM) and the high mounted stoplamp. The GEM then supplies voltage to the rear lamps.

Turn Signal Lamps and Hazard Warning Lamps
The turn signal lamps and hazard warning lamps system consists of:
  • Hazard switch
  • Multifunction switch
  • GEM
  • Turn signal lamps
When the multifunction switch is placed in the LH or RH turn positions, a voltage signal from the GEM is routed to ground. When the GEM detects the multifunction switch in the LH or RH turn position, the GEM supplies voltage to the appropriate turn lamps in a flashing manner. When operating correctly, the turn lamps flash approximately 80 times per minute.
When the hazard warning switch (located in the upper part of the center console) is switched on, a voltage signal from the GEM is routed to ground. When the GEM detects that the hazard switch is switched on, the GEM supplies voltage to all the turn signal lamps in a flashing manner. When operating correctly, the hazard lamps flash approximately 80 times per minute.

Do you know how to test electrical circuits with a DVOM - digital volt ohm meter , how to read an use a wiring diagram to pin point locations in a electrical circuit for testing B+ voltage an ground ?

Free wiring diagrams
http://www.bbbind.com/free_tsb.html Enter your vehicle info . year ,make , model an engine size . Under system click on lighting ,then under subsystem click on turn signal lamps . Click the search button then each blue link , one at a time .


Electric Testing Techniques You Need to Know
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts

May 07, 2017 | Ford Cars & Trucks

1 Answer

Can you help me determine what is going on with my car?


Your headlamp problem sounds like a lose connection , need to check the fit of the terminal pins at the headlight connector ! or you have a wire broke inside the insulation or a bad ground wire ! Are both high an low beams inoperable ?
You other light problems are not that easy to say it's this or that ,not when a control module is involved . When the BCM is involved in controlling these thing's the first thing to do would be hook up a professional grade scan tool an check for DTC'S - diagnostic trouble codes , in the bcm no the engine computer ! An then check inputs to the BCM from brake switch , headlamp , turn signal etc... An outputs from the BCM to the components that are not working ! Here is a description of how it works !
Turn Signal Lamps
The body control module (BCM) is responsible for controlling the turn signals and hazard lamps. When the turn signal switch is placed in either the left turn or right turn position, the BCM receives a signal from the turn signal switch. The BCM then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, the BCM receives a signal from the hazard switch. The BCM then will send an on-off voltage signal to all the turn signal lamps. All the turn signal lamps will flash including both IPC turn signal indicators.
Stop Lamps
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP LP fuse to illuminate the center high mounted stop lamp (CHMSL).
Did you ever spill a drink down the right side of your console or have a windshield leak ! The BCM is located on the right side of the shift console ?

Jul 20, 2015 | 2007 Pontiac G6

1 Answer

Hazard lights malfunction


YOU MIGHT HAVE A BURNT OUT RELAY IN FUSE COMPART UNDER YOU CARS HOOD CHECK THAT OUT THRU YOUR CARS MANUAL,IT WILL SHOW YOU WHICH RELAY IT IS?

May 24, 2013 | Cars & Trucks

1 Answer

Rear lights not working on 2002 suzuki grand vitara


In the underdash fuse/relay box, the 15A TAIL fuse feeds power to the coil of headlight relay 2. When the combination switch is set to TAIL, the relay closes and the outer tail lamps light. In the same underdash fuse/relay box, the 20A STOP fuse feeds power to the brake light switch. When the brake pedal is pressed, the inner brake lamps light. The underdash fuse/relay box also contains the 10A TURN BACK fuse which feeds power to the hazard switch and the turn signal relay. Relay output is fed to the combination switch and turn signal power is applied to the selected middle tail light. The fourth fuse in the underdash fuse/relay box is the 15A HAZARD fuse which feeds power to the hazard switch and turn signal relay. When the hazard switch is set, the turn lamps on both sides begin flashing.

Sep 18, 2012 | 2002 Suzuki Grand Vitara

1 Answer

I have a 99 Pontiac Sunfire, 2.2L and my turn signals quit working. I replaced the combination switch and the flasher/hazard relay, and still no joy. The problem was intermittent, and now it's just dead....


It will turn on when I hit the button and the turn signals do work. All of this has led to my ABS lights to come on as well. ??????????? Your best bet , take it to a qualified repair shop or learn to do better explanation's ! Or lean to do automotive electrical testing .
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Electric Testing Techniques You Need to Know

How to Use Multimeter to Troubleshoot Common Problems

Do you know what a wiring diagram is ? How to use a DVOM - digital volt ohm meter ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year make ,model and engine size. Under system click on lighting ,then under subsystem click on turn signals . Click the search button then the blue links .Check power an ground circuits ! This is how we diagnose electrical faults , not just replacing parts .

Turn Lamps
Voltage is applied through the TURN fuse and the turn/hazard flasher when the ignition switch is in the following positions:
• RUN
• BULB TEST
• START
The voltage travels to the contact in the hazard switch. The hazard switch is located in the turn/hazard-headlamp switch assembly. This contact is normally closed.
When the left turn signal is turned on, voltage is applied to the following components.
• The left turn indicator
• The left front park/turn lamp circuit 14
• The left rear turn lamp circuit 18
The turn lamps turn on immediately. The current flow heats up the timing element. The timing element is located in the turn/hazard flasher. The timing element repeatedly opens and closes the circuit. This action causes the turn lamps to begin flashing.
The voltage that is applied to the left front park/turn lamp is also applied to the left front marker lamp. If the headlamp switch is in the OFF position, the left front marker lamp will find a path to ground through one of the following lamps. The following lamps provide low resistance paths to ground:
• The right front marker lamp
• The right turn indicator
• The right front park/turn lamps
• The left front park/turn lamps
The left front marker lamp flashes with the turn lamps. The voltage drop across the marker lamp is much higher than the voltage drop across the other lamps. The lamps that are used for the ground path will not flash.
When the headlamp switch is in either the PARK or HEAD positions, voltage is applied through the following components:
• The EXT LP fuse
• The marker lamps
• The park lamps
When the left turn signal is turned on, the left marker lamp will have voltage at both connections. The left marker lamp does not light. When the turn/hazard flasher stops the voltage to the turn lamps, the marker lamp is grounded through the turn lamp. The marker lamp does not go on. The left front marker lamp flashes in the following manner:
• The left front marker lamp flashes on when the turn filament of the left front park/turn lamp goes off.
• The left front marker lamp flashes off when the turn filament of the left front park/turn lamp goes on.
Voltage is applied to the right lamps in the same manner, when the right turn signal is turned on.
Hazard Lamps
Voltage is applied at all times through the following components to the normally open contact of the hazard switch in the turn/hazard-headlamp switch assembly:
• The STOP HAZ fuse
• The turn/hazard flasher
When the hazard switch is turned on, voltage is applied to the following components:
• The front turn lamps
• The rear turn lamps
The following lamps flash on and off:
• All of the turn lamps
• Both of the turn indicators
The front marker lamps flash with the hazard lamps on, just as the front marker lamps flash when the turn lamps are on. If the headlamp switch is in the OFF position, the front marker lamps flash on when the hazard lamps are on. The front marker lights will flash on when the hazard lamps are on if the headlamp switch is in one of the following positions:
• PARK
• HEAD
When the hazard lamps are on, the following conditions apply:
• The turn circuit is always open.
• The turn/hazard flasher controls the lamp.
Park/Marker Lamps
Voltage is applied through the EXT LP fuse, to the headlamp switch at all times. Voltage is applied to the park lamps and the marker lamps when the headlamp switch is in the following positions:
• PARK
• HEAD
The front marker lamps are grounded through the turn filament of the respective front park/turn lamp. The front marker lamps light as a result.
Stop Lamps
Voltage is applied through the STOP HAZ fuse to the brake switch at all times. When the brake pedal is depressed, the brake switch closes. This action applies voltage through the turn/hazard-headlamp switch assembly to the following lamps:
• The high mounted stop lamp assembly
• The left tail/stop-turn lamps
• The right tail/stop-turn lamps


Jun 30, 2017 | 1999 Pontiac Sunfire

1 Answer

Turn signals, Hazard lights


I would replace the bar switch assembly.

May 18, 2017 | 1998 Jeep Wrangler

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