Question about 1984 Jeep CJ7

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Can not get power to the headlamps. changed new light switch and replaced fuses. no power to front head lamps. it seems it is not giving any output. something seems to be disconnected. back light light up but blinkers nor reverse light up.

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  • Richard Scordino May 11, 2010

    OK...you posted twice...omit what I said about switch but make sure there's not more than one fuse. Otherwise my answer stands...follow power flow till you find where it stops, then find out why.

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Check your dimmer switch . power goes from switch to dimmer to lights . the floor mount dimmers get dirty and lose contact sometimes .

Posted on Sep 30, 2009

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THIS ONES TOUGH WITH OUT SEEING THE AUTO. TRACE THE WIRES FROM THE LTS TO THE FIRE WALL AND SEE IF THERE IS ANOTHER CONNECTION THAT CAME LOOSE. IF NO ATHER CONNECTION I WOULD CHECK FOR POWER ON BOTH SIDES OF THE FUSE FOR THE LIGHTS YOU SHOULD HAVE VOLTAGE IN TO THE FUSE AND OUT THE OTHER SIDE OF THE FUSE. BUY A TEST LIGHT FOR THIS THEY ARE CHEAP AND YOU GET A BETTER RESULT. YOU CAN GROUND ONE SIDE OF THE TEST LITE AND PEARCE THE WIRES TO SEE IF THE WIRES ARE GOOD OR BAD
GOOD LUCK ON THIS PROBLEM

Posted on Sep 23, 2009

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2005 cavalier dash lights not working. all fuses are goood. replaced cluster, dimmer switch, multifunction switch


Back lighting or warning lights ? check engine , ABS , air bags , seat belt , oil light etc... ?
Interior Lamps Dimming
The second group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.
• Power window switches
• HVAC control head assembly
• Radio
• The instrument panel cluster (IPC)
When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) display (radio) turns on at maximum brightness. When the park lamps are ON all incandescent back lighting turn ON at the dimming level indicated by the IP dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. When the headlamp switch is placed in the PARK position, the park lamp supply voltage circuit provides an input to the body control module (BCM). The BCM then supplies voltage to the instrument panel dimmer switch through the instrument panel dimming lamps control circuit. The setting of the instrument panel dimmer switch determines the amount of voltage that the instrument panel dimmer switch supplies to the BCM through the instrument panel dimming lamps low reference circuit. The BCM then sends a pulse width modulated (PWM) voltage to all the interior lamps. All the vacuum florescent (VF) and incandescent back lighting lamps are provided a specific voltage and are then grounded. When the headlight switch is turned to the PARK or HEADLAMP position, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. When the IP dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from Minimum intensity to maximum brightness in response to the IP dimmer switch.

I would have it checked for DTC'S - diagnostic trouble codes stored in the BCM !
DTC B2624 Display Dimming Input Range/Performance
The body control module (BCM) supplies voltage to the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit. The dimmer switch varies the voltage and returns the new voltage to the BCM through the dimmer switch signal return circuit. The BCM uses this voltage to determine the illumination level of the instrument panel lamps.

DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit Range/Performance
The body control module (BCM) receives a variable voltage from the instrument panel (I/P) lamp dimmer switch. The BCM uses this signal in order to vary the illumination level of the I/P lamps. The I/P dimming lamps output from the BCM is a pulse width modulated voltage supply used to light the I/P lamps. If a malfunction occurs in the I/P dimming lamps output circuit, this DTC is set.

DTC B2662 Park Lamp Switch Circuit Malfunction
The park lamps are controlled by the turn/headlamp switch. Positive battery voltage is supplied to the switch through the EXT LP fuse. When the turn/headlamp switch is placed in the park or head position, battery voltage is supplied to the park lamps. The body control module (BCM) is also connected to the park lamp circuit to sense whether or not the park lamps turn ON when the low beam or high beam headlamps are turned ON. The BCM also uses the parklamp battery positive voltage to power the instrument panel (I/P) dimmer output circuit. If the BCM senses that the low beam or high beam headlamps are ON and the park lamp input is not active, DTC B2662 sets.
Do the park lamps work ?

Jun 11, 2017 | Cars & Trucks

1 Answer

How do i bim and brighten dash light 2002 buick lesabre


bim or DIM ? the dimmer switch ! Interior Lamps
The interior lamps consists of two groups, lamps that can not be dimmed and lamps that can be dimmed. This first group consists of lamps that may not be dimmed. This includes those lamps that may be manually turned on by placing the interior lamp switch to the DOME position, or by opening a door or a compartment:
• Door courtesy lamps
• Footwell courtesy lamps
• Instrument panel (I/P) compartment lamp
• Overhead console courtesy lamps
• Reading courtesy lamps
• Rear compartment courtesy lamp
• Roof rail courtesy lamps
• Sunshade vanity mirror lamps

Interior Lamps Dimming
This group of interior lighting includes lamps which may be dimmed. This group uses a combination of class 2 controlled illumination and incandescent lamps:
• Air temperature switch
• Cigar lighter lamp
• Door switches
• Driver information center (DIC) switch
• Headlamp switch
• Head-up display (HUD) switch
• Heated seat switches
• HVAC control assembly
• Instrument panel cluster (IPC)
• Memory function switch
• Radio
• Steering wheel controls
• Window switches
For the interior lighting to be dimmed the following conditions must be met:
• A low light level has been detected by the dash integration module (DIM)
• Headlamp switch is placed in to the PARK or HEAD position
• Ignition switch is placed in the ON position
Then all class 2 displays and all incandescent back lighting will be illuminated to the level set by the instrument panel (I/P) dimmer switch. When the I/P dimmer switch is moved from MIN to MAX, all class 2 displays and all incandescent back lighting respond from minimum intensity to maximum brightness.
The DIM supplies battery positive voltage to the coil side of the PRK LP relay in the rear fuse block.
When the I/P dimmer switch is moved from MIN to MAX, then the instrument panel module (IPM), W/CJ2, or climate control panel (CCP), W/C67, applies a message to the class 2 communication circuit to the DIM. The DIM then applies a ground to the park lamp relay control circuit. This energizes the PRK LAMP relay and allows battery positive voltage to be applied through the DIMR fuse to the DIM. The DIM then illuminates the following incandescent lamps through the incandescent dimming output circuit:
• Cigar lighter lamp
• DIC Switch
• Headlamp switch
• HUD switch
• HVAC control assembly
• IPC
• Radio
• Steering wheel controls
The DIM also applies a message to the following class 2 controlled illumination components:
• Drivers door module (DDM)
• HVAC control assembly
• IPC
• Radio
The DDM will then send a message through the simple bus interface (SBI) to the RH front door module (RFDM). The door modules will then illuminate the following components through the incandescent dimming output circuit:
• Air temperature switch
• Heated seat switches (W/KA1)
• Memory function switch (W/A45)
• Power door lock switches
• Power window switches
The ground for these components are provided from the DDM and RFDM.
The following components are grounded at G200:
• Headlamp switch
• HVAC control assembly
• IPC
• Radio
• Steering wheel controls
The following components are grounded at G201:
• Cigar lighter lamp
• DIC Switch
• HUD switch

Mar 13, 2017 | 2002 Buick LeSabre

1 Answer

2000. Where is fuse for tail lights?


Do your headlamps work ?
Park/Marker/License/Tail Lamps
Voltage is applied to the turn/headlamp switch at all times. When the turn/headlamp switch is in the PARK or the HEAD position, voltage is applied to the following components:
?€¢
The park lamps


?€¢
The marker lamps


?€¢
The tail lamps


?€¢
The license lamp

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.
The automatic lamp control function turns on the park lamps and the headlamps. This action occurs when the ambient light sensor determines that the exterior lamps should be turned ON based on the amount of available light. When the BCM grounds the park lamp relay, voltage is supplied directly to the park lamps, bypassing the turn/headlamp switch assembly. When this action occurs, the following conditions exist:
?€¢
The automatic lamp control relay is grounded.


?€¢
The headlamps turn ON. Refer to Headlights/Daytime Running Lights (DRL) Circuit Description .

The lamps turn OFF when the BCM does not ground the park lamp relay or the automatic lamp control relay. This action is caused by the following conditions:
?€¢
The available light reaches a predetermined level.


?€¢
The ignition switch is turned to the OFF position

Mar 31, 2016 | Pontiac Grand Am Cars & Trucks

1 Answer

Why aren't parking lights working?


Park lamp fuse 20amp located in the under hood fuse box .DRL control module
Daytime Running Lamps (DRL) Control Module
Right of the steering column, behind the IP
Park, Sidemarker, Tail and License Lamps
Voltage is applied continuously to the PARK fuse to the headlamp and the instrument panel (IP) lamp dimmer switch through CKT 1340.
When the headlamp and the (IP) lamp dimmer switch is in the PARK or HEAD position, voltage is applied to CKT 9 thus activating the following lamps:
• The park lamps
• The side marker lamps
• The tail lamps
• The license lamps
The park/turn lamps are the only lamps that do not activate yet receive a current from CKT 9. The park/turn lamps do not activate because the voltage drop across the front side marker lamps is much higher than that across the turn lamp filaments Step
Action
Normal Result(s)
Abnormal Result(s)*

1
Turn the headlamp/instrument panel (IP) lamp dimmer switch to the PARK position.
The following lamps light:
• The license plate lamps
• The taillight lamps
• The front side marker lamps (Domestic)
• The front parking lamps (Domestic)
The headlamp position lamps (Export)
Refer to Park Lamps Inoperative
Park Lamps Inoperative
Step
Action
Value(s)
Yes
No

1
Inspect the PARK LP fuse.
Is the fuse open?
--
YES - Go to Step 2
NO - Go to Step 3

2
Repair a short to ground in CKT 1340.
Is the repair complete?
--
Go to Exterior Lights System Check
--

3
Turn the headlamp/instrument panel (IP) lamp dimmer switch to the PARK position.
Use a test light in order to backprobe the headlamp/IP lamp dimmer switch harness connector between terminal R and ground.
Did the test lamp light?
--
Go to Step 7
Go to Step 4

4
Use a test light in order to backprobe the headlamp/IP lamp dimmer switch harness connector between terminal O and ground.
Did the test lamp light?
--
Go to Step 5
Go to Step 6

5
Replace the headlamp/IP lamp dimmer switch. Refer to Headlamp Switch Replacement .
Is the repair complete?
--
Go to Exterior Lights System Check
--

6
Repair the following conditions in CKT 1340 between the PARK LP fuse and the headlamp and the IP lamp dimmer switch harness connector terminal O:
• A faulty connection
• An open circuit
Is the repair complete?
--
Go to Exterior Lights System Check
--

7
Repair the following conditions in CKT 9 between the headlamp and the IP lamp dimmer switch harness connector terminal R and S204:
• A faulty connection
• An open circuit
Is the repair complete?
--
Go to Exterior Lights System Check

Feb 18, 2016 | 1999 Pontiac Montana

1 Answer

I have no headlights, taillights, cluster lights and speedometer has stop working?


Have you checked applicable fuses for everything except head lamps? The headlamps themselves don't use a fuse. Check the battery junction block under the hood, one of your positive battery cables should go to junction block. If several fusible links check them. My info shows red wire carries battery voltage to head lamp switch for headlamps. The headlamp switch has two voltage circuits, mainly, one for the head lamps, for the other lamps that the switch controls, those smaller lamps are fuse protected.

Dec 02, 2015 | GMC Sierra 1500 Cars & Trucks

1 Answer

Headlights won't come on together on 2002 dodge caravan. Change the CCM & ECM no change, any other suggestions? Thank you


DIAGNOSIS AND TESTING - HEADLAMP

When a vehicle experiences problems with the headlamp system, verify the condition of the battery connections, fuses, charging system, headlamp bulbs, wire connectors, relay, high beam switch, dimmer switch, and headlamp switch. Refer to the appropriate wiring information.
Each vehicle is equipped with various lamp assemblies. A good ground is necessary for proper lighting operation. Grounding is provided by the lamp socket when it comes in contact with the metal body, or through a separate ground wire.
When changing lamp bulbs check the socket for corrosion. If corrosion is present, clean it with a wire brush.
When it is necessary to remove components to service another, it should not be necessary to apply excessive force or bend a component to remove it. Before damaging a trim component, verify hidden fasteners or captured edges are not holding the component in place. Don't replace parts unless you test an your sure that is the problem. Check the basic's first ! Then find a wiring diagram an see what all is involved , connectors , grounds , power an do a voltage drop test on the circuit to find the problem !An a scan tool would come in handy as well ,to do bi-directional tests !

HEADLAMP SYSTEM

The configuration of the headlamp system of headlamps, park lamps and fog lamps is determined by the BCM. The BCM -body control module determines the lighting configuration as a result of the inputs from the ignition switch, headlamp switch and multi-function switch. A PCI bus-serial data communication network is transmitted from the BCM to the FCM to enable the necessary drivers to set the illumination configuration. Four wires are connected between the headlamp switch and the BCM. The first wire contains information regarding the position of the headlamp switch (Off, Automatic Headlamps, Automatic Headlamp switch fog, Park with Fog, Head, or Head with Fog Lamps). The second wire contains information regarding the position of the dimmer switch (Dome Lamp, Daytime Brightness, Dimming Level or Off). The third wire is a dedicated signal return (ground) wire. The fourth wire provides power to the front fog lamp indicator. You should take this to someone who knows what's up rather then just replacing parts !

Jan 30, 2015 | Dodge Cars & Trucks

1 Answer

I have a 98 chevy malibu. the tail lights, running lights and instrument lights do not work but head lights do


The good news is that all of these problems stem from the same source: the 15A PARK LPS fuse in the underhood wiring harness junction block. When you set the turn/headlamp/wiper switch to PARK, the park lamp relay in the junction block closes and power is applied to the front marker lamps and the park filament of the front park/turn lamps as well as the tail filaments of the rear tail/stop lamps.

As for the instrument lights, that same PARK LPS fuse applies power to the same turn/headlamp/wiper switch that, when set to PARK or HEAD applies power to the variable panel dimmer switch which lets you set the illumination level. Switch output is applied to the lamp dimmer module and module output passes through the 10A INST LAMPS fuse in the right I/P wiring harness junction block to the instrument lamps

Oct 13, 2012 | 1998 Chevrolet Malibu

1 Answer

'86 Mustang Head Light Switch Pin Out Connectors?


I can give you 94 mustang. Don't have 86 but maybe similar

7fc8945.gif Pin Number Circuit Circuit Function B1 38 (BK/O) Power Supply to Battery B2 195 (T/W) Tail Lamp Switch Feed I 19 (LB/R) Instrument Panel Lamp Feed IGN — Not Used R 14 (BR) Headlamp Switch to Tail Lamp and Side Marker Lamps H 15 (R/Y) Headlamp Dimmer Switch Feed DN — Not Used D1 54 (LG/Y) Interior Lamp Switch Feed D2 706 (GY) Battery Saver Door Switch Feed

Apr 30, 2009 | 1986 Ford Mustang

2 Answers

My low beam lights come on.


dimmer switch is bad

Jan 26, 2009 | 2004 Ford F350

1 Answer

Tail lamps and front corner lamps inop


If the fuse was melted, I doubt that all 4 bulbs went bad at once. It sounds like you have a short circuit there. The power goes from the fuse, up to the head lamp switch and then to the 4 lamps. Check to see if the headlamp switch is working properly.
Charlie

Nov 16, 2008 | 2002 Dodge Ram Maxi

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