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The intensity of illumination of light source varies inversely as the square of the distance between the source and the piont at which the measurement is taken. if =20 lumens when d=5 meters, find i when d=2 meters

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Dash lights on2000 corvette dim


Sounds like a ground issue , resistance . Find a wiring diagram here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model , engine . Under system click on body & accessories . Subsystem click on instrumentaion . Click the search button . click the link . Then watch this video on voltage drop testing Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Electric Testing Techniques You Need to Know Pull the instrument
cluster to where you can get to the connector plugged into the back an do loaded circuit voltage testing .

Whenever the headlamps or parking lamps are on voltage is supplied to the manually operated dimming level control switch in instrument cluster through the parking lamp feed circuit 9. The output of the dimming level control switch is then converted into a serial data message that is sent through serial data circuit 1036 to the data link connector (DLC) Splice Pack #206. The Body Control Module (BCM) uses this input to control the dimming of the brake transmission shift lock control PNRDL indicator, the HVAC control assembly (C60 or CJ2), and the electronic traction suspension control switch lamp. The brake transmission shift lock control PNRDL indicator is supplied battery voltage at all times through circuit 240. The electronic traction suspension control switch lamp is supplied voltage through the parking lamp feed circuit 9 whenever the headlamps or parking lamps are on. The BCM provides a pulse width modulated (PWM) ground circuit to vary the intensity of the brake transmission shift lock control PNRDL indicator, and the electronic traction suspension control switch lamp. The HVAC control assembly (C60 or CJ2) receives a pulse width modulated (PWM) voltage supply from the BCM to control the intensity of its display. The HVAC control assembly (C60 or CJ2) is grounded through circuit 150 to Splice Pack #202 to G202.
The class 2 data message which is sent out by the instrument cluster is also used by the LH and RH Door Control Modules (DCM) to control the dimming of the LH door switch illumination and the RH door switch illumination. The DCMs supply the 12 volt feed circuit to the door switch illumination lamps and provide a pulse width modulated (PWM) ground circuit to vary the intensity of the illumination lamps

Mar 30, 2017 | 2000 Chevrolet Corvette

1 Answer

I have an 06 ford explorer the instrument cluster lights and radio lights don't work


Are these the lights you are talking about ?
Instrument Cluster and Panel Illumination The instrument cluster and panel illumination is used to provide backlighting to the instrument panel, switches, and control components when the headlamp switch is in either the PARKING LAMPS ON or HEADLAMPS ON position. The level of intensity is adjustable by rotating the instrument panel dimmer switch either up to increase intensity or down to decrease intensity.
Fixed Backlighting When the accessory delay relay is energized, switched voltage is supplied to the non-dimmable components and switches.
Dimmable Backlighting When the parking lamps or the headlamps are in the ON position the smart junction box (SJB) monitors the input from the instrument panel dimmer switch. The SJB sends a pulse-width modulated (PWM) voltage to the dimmable components and switches based on input received from the instrument panel dimmer switch. The SJB also sends a message over the controller area network (CAN) to the audio unit, and the instrument cluster to indicate the backlighting intensity level.
If you don't know about PWM an smart junction box your better off taking your vehicle to a quailified repair shop ! You don't the diagnostic tools or technical information . May have DTC'S - diagnostic trouble codes stored in the SJB (computer ). Do you know where SJB is located ?
Visual Inspection Chart Electrical
  • Smart junction box (SJB) fuse 23 (15A)
  • Bulb(s)
  • Circuitry
  • Connectors
  • Illumination source(s)
  • Auxiliary climate control switches (if equipped)
  • Door lock control switches
  • Window control switches
  • Headlamp switch
  • Dual electronic automatic temperature control (DEATC) module
  • Audio unit
  • SJB
  • Instrument cluster

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
  • check that the program card is correctly installed.
  • check the connections to the vehicle.
  • check the ignition switch position.
  1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
  • CAN circuits fault; all electronic control units no response/not equipped, refer to Section 418-00 .
  • No response/not equipped for SJB, refer to Section 419-10 .
  • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the SJB.
  1. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index.
  1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .
    • The control illumination is inoperative
    • Fuse
    • Smart junction box (SJB)
    • Go To Pinpoint Test A .
    • The instrument cluster illumination is inoperative
    • Instrument cluster
    • CHECK the audio unit illumination for correct operation.
      • If the audio unit illumination operates correctly, INSTALL a new instrument cluster. REFER to Section 413-01 . TEST the system for normal operation.
      • If the audio unit illumination does not operate correctly, REFER to Section 418-00 to continue diagnosis of the communications network.
    • The audio unit illumination is inoperative
    • Audio unit
    • CHECK the instrument cluster illumination for correct operation.
      • If the instrument cluster illumination operates correctly, REMOVE the audio unit. REFER to Section 415-01 . SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
      • If the instrument cluster illumination does not operate correctly, REFER to Section 418-00 to continue diagnosis of the communications network.

Sep 04, 2016 | 2006 Ford Explorer

1 Answer

Why aren't lights for center console on the shifter working?


Could have a wiring problem , a wiring pin backed out of a connector ! If you don't know about automotive electrical an wiring diagrams an electrical wiring trouble shooting I suggest you take it to a ASE certified repair shop .
Instrument Cluster and Panel Illumination The instrument cluster and panel illumination is used to provide backlighting to the instrument panel, switches, and control components when the headlamp switch is in either the PARKING LAMPS ON or HEADLAMPS ON position. The level of intensity is adjustable by pushing the instrument panel dimmer switch either up to increase intensity or down to decrease intensity.
The dimmable backlighting components are:
  • Instrument cluster
  • Hazard switch
  • Rear defroster switch
  • Message center switches
  • Parking aid switch (if equipped)
  • Transmission range selector
  • Fog lamp switch
The non-dimmable backlighting components are:
  • Driver front door lock and power window control switch
  • Passenger front door lock and power window control switch
  • Driver rear door power window control switch
  • Passenger rear door power window control switch
Principles of Operation
The instrument cluster sends a signal to the instrument panel dimmer switch. The instrument cluster provides a variable pulse width modulated (PWM) signal to the dimmable backlighting components in accordance with the position of the instrument panel dimmer switch.
  1. Verify the customer concern.
  1. Visually inspect the following for obvious signs of mechanical or electrical damage.

    Visual Inspection Chart Mechanical Electrical
    • Instrument panel dimmer switch
    • Smart junction box (SJB) fuse(s):
      • 7 (10A)
      • 15 (30A)
    • Circuitry
    • Illumination bulbs
    • Instrument cluster
    • SJB
    1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    1. NOTE: Make sure to use the latest scan tool release software.
      If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
    1. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
      If the scan tool does not communicate with the VCM:
      • Check the VCM connection to the vehicle.
      • Check the scan tool connection to the VCM.
      • Refer to Section 418-00 , No Power To The Scan Tool, to diagnose no communication with the scan tool.
    1. If the scan tool does not communicate with the vehicle:
      • Verify the ignition key is in the ON position.
      • Verify the scan tool operation with a known good vehicle.
      • Refer to Section 418-00 to diagnose no response from the powertrain control module (PCM).
    1. Carry out the network test.
      • If the scan tool responds with no communication for one or more modules, refer to Section 418-00 .
      • If the network test passes, retrieve and record the continuous memory DTCs.
    1. Clear the continuous DTCs and carry out the self-test diagnostics for the instrument cluster.
    1. If the DTCs retrieved are related to the concern, go to the Instrument Cluster Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to Section 419-10 .
    1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .
Symptom Chart Condition Possible Sources Action
  • One or more module-controlled illumination source(s) is inoperative
  • Circuitry
  • Inoperative illumination source component
  • Go To Pinpoint Test A .
A2 CHECK VOLTAGE TO THE INOPERATIVE ILLUMINATION SOURCE
  • Key in OFF position.
  • Disconnect: Inoperative Illumination Source Connector.
  • Key in ON position.
  • Place the headlamp switch in the PARKING LAMPS ON position.
  • Measure the voltage between the inoperative illumination source, harness side and ground according to the following table:

    Illumination Source Connector- Pin Circuit Rear window defrost switch C2340-3 19 (LB/RD) Hazard flasher switch C2039-8 19 (LB/RD) Parking aid disable switch C2339-3 19 (LB/RD) Message center INFO switch C269a-3 19 (LB/RD) Message center SET switch C269b-3 19 (LB/RD) Transmission range selector C2096-4 19 (LB/RD) Fog lamp switch C2341-3 19 (LB/RD)
  • Is the voltage greater than 10 volts?

Feb 02, 2016 | 2008 Mercury Mariner

1 Answer

The dash board lights are out. Which fuse controls the dashboard lights?


The fuse may be identified as 'Accessories' or the problem may not be related to a failed fuse at all. I suspect your car has a dimmer like most that varies the intensity of the dash and other panel lights. Dimmers do fail so the lack of illumination may be caused by a failed switch or dimmer.

Jun 13, 2010 | 1994 Volvo 940

1 Answer

I just installed the right head light on a 2000 f250. I'm trying to find the specifications on distance and height of the light beams, L &R when adjusting the lights.


Headlamp Adjustment —Screen Method Aiming NOTE: Horizontal aim is not necessary for this vehicle and is not adjustable.
NOTE: Consult your state's vehicle inspection manual for recommended tolerance ranges for visual aiming.
  1. NOTE: The sight shield may need to be positioned or removed for access to the adjusters.
    Before starting headlamp assembly adjustment:
    • Check the tire inflation.
    • Check that no other load is in the vehicle other than a half tank of gas.
    • Check that the headlamps are clean.
    • Check for correct headlamp operation.
    • Check that the vehicle is on level ground.
    • If the vehicle is equipped with air suspension, make sure the switch is on.
    • NOTE: The vertical wall or screen must be a minimum of 2.4 meters (8 feet) wide.
  2. Park the vehicle on a level surface approximately 7.6 meters (25 feet) from the vertical wall or screen directly in front of it.
  3. e4d4fd8.gif
    NOTE: The center of the lamp is marked by a 3 mm (0.12 in) circle on the headlamp lens.
    Mark a horizontal reference line on the vertical wall or screen.
    1. Measure the center of the headlamp height to ground and record.
    1. Make a 2.4 meters (8 feet) horizontal mark (masking tape) on the vertical wall or screen at the same distance from the ground as previously recorded.

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  1. NOTE: This procedure should be done in a dark environment to effectively see the headlamp beam pattern.
    Turn on the low beam headlamps to illuminate the wall or screen and open the hood.
  1. NOTE: The appearance of the beam pattern may vary between vehicles.
    On the wall or screen, locate the high intensity area of the beam pattern.

7ced4e6.gif NOTE: The appearance of the beam pattern may vary between vehicles.
Identify at the top edge of this high intensity area a distinct horizontal cutoff in the beam pattern. If the top edge of this cutoff is not even with the horizontal reference line, the headlamp beam will need to be adjusted.

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Apr 06, 2010 | 2000 Ford F250 Super Duty Crew Cabs

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