Question about 1992 Buick Roadmaster

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92 roadmaster instrument lights

When i switch on the lights the instruments stay dark and the radio illumination goes off. everything else works fine, radio still plays and presets stay.

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  • Buick Master
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Oh boy, I just went through this with my '92 Lesabre, took a long time to trace it all down, and wound up splicing in a new wire just to my instrument cluster lights. A short kept blowing fuses somewhere in that circuit.
Down where your feet go, up under the dash at the fuse panel, there is a 15 amp fuse for park/tail lights. When you hit the light switch (for heads or park lights), power is sent to that fuse, and then to the exterior park lights. There is another wire from that fuse (green wire on mine) that also goes up under the dash, and splices to several bulbs-on the radio, on the HVAC controller, on the ashtray light, also one to the under hood lamp, and then one to the dimmer/brighter switch on the dash, the rheostat that controls brightness of interior lights. One of the green splices goes into this switch, and then another wire goes from this switch to the instrument cluster for the gauge and dash illumination. I couldn't find the short, so ran a new wire from the park light fuse to the gray wire to the instrument cluster for the cluster bulbs. I bypassed the dimmer, and left off the HVAC bulbs and ashtray light. Too much trouble to wire them all up, and think my short may have been in the dimmer rheostat.
If you have a voltmeter, pull out the dimmer switch and check for power on those wires, the green from the fuse. The park light must be switched on, or the fuse has no power. There be 8 or 9 wires on that dimmer rheostat-I never did figure out where all of them went. Asked all over a Buick forum, but nobody had an answer.

Posted on Dec 02, 2016

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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

2 Answers

'95 Lincoln town car. Husband was driving uphill and the digital dash suddenly went dark. Radio is working and a/c is not. Exterior light still working and so are interior lights besides the dash


Could be a bad wire possibly chaffing or grounding out to to another wire or frame. Check your fuses. You may want to pull the dash out and check that wiring as well

Jul 07, 2015 | Lincoln Cars & Trucks

1 Answer

How do I replace dash light bulbs on a 2007 Ford Escape?


What lights are not working ? The instrument cluster illumination is inoperative or all the lights ,radio , heater control head, all the switches that would be back lighted.
  • The climate control panel illumination is inoperative , The passenger door lock control switch illumination is inoperative. Could need new dimmer switch , new instrument cluster. When installing a new instrument cluster, it is necessary to upload the module configuration to the scan tool. Following installation of the new instrument cluster, download the module configuration from the scan tool into the new instrument cluster. Refer to Section 418-01 .
  • Dec 09, 2014 | 2007 Ford Escape

    2 Answers

    Dash lights will not work?


    Check that your tailights/parking lights are working (not the headlights) as this fuse and relay feeds all the instument lights too.... Fuse 15amp TAIL & Tailight Relay

    If not then check:
    The rheostat (also known as the dimmer switch) may be faulty
    as it controls all the illumination of all the backlight bulbs and other dimable switches/indicators.

    In general bulbs all together draw a fair amount of current so it is possible that the wiring or ground at the major supply junction feeders has failed but that is a less common problem.

    So check the rheostat dimmer wiring area first as all illumination power goes through it.

    There is further simple testing we can do with the three wires at the rheostat you can check the entire illumination system.
    If you jumper the white/blk to the white/blk all the illumination lights should come on (that means the rheostat is bad).

    Or use a voltmeter and measure the green rehostat wire to ground it should be 12volts (if not time to check the fuse, relay and wiring)

    If not then finally declare the instrument panel faulty (like burned up circuit board trace).

    Note of interest: the rheostat also controls (dims) other switches not associated with the instrument cluster such as the cigarette lighter bulb and hazard switch and radio player and A/C control switch. So if those are dimming but not the instrument panel backlights then yes the instrument cluster needs fixing or a very close wiring inspection.

    Sep 28, 2009 | Toyota Pickup Cars & Trucks

    1 Answer

    A digram for the factory wireing for the radio


    This color code works for 87-93 mustang factory radio; it might work on yours as well. I'm not sure if it has the same fuses though.

    Radio Connector:

    Light Green / Yellow - Hot at all times (Fuse 8)
    Yellow / Black - Hot in ACC or Run (Fuse 11)
    Light Brown / Red - Goes to instrument panel dimming rheostat (Fuse 4)
    Red - Ground
    White / Purple - Hot in ACC or Run (Fuse 11)

    Speaker Connector:

    White / Light Green - (+) Right Instrument Panel & Door Speaker
    Dark Green / Orange - (-) Right Instrument Panel & Door Speaker
    Brown / Pink - (+) Right Rear Speaker
    Pink / Light Brown - (-) Right Rear Speaker
    Pink / Light Green - (+) Left Rear Speaker
    Tan / Yellow - (-) Left Rear Speaker
    Light Brown / White - (+) Left Instrument Panel & Door Speaker
    Orange / Light Green - (-) Left Instrument Panel & Door Speaker
    Hope this helps.

    Aug 15, 2009 | 1991 Ford Econoline

    1 Answer

    Instrument lights won't turn off


    hi,seem lighting switch is grounded or wiring for cluster is grounded,if can remove the lighting switch disconnected the wire,see if light in cluster is off,switch or wiring must check,ty

    Mar 29, 2009 | 1991 Jaguar XJ6

    1 Answer

    I need a printable image of fuse block / 97 ford windstar


    your owner manual sould have fuse chart. Some fuses/ekays in enine compartment. Some in car on left side of instrument panel

    in car

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    Fuse Amps Circuits Protected 1 10 Power Mirrors, Anti-Theft Warning Light, Diagnostic Connector 2 5 Generic Electronic Module, Start Interrupt Relay Coil 3 5 Radio Illumination, Remote Radio Illumination, Electronic Instrument Cluster, Electronic Instrument Cluster PRNDL Illumination, Electronic Instrument Cluster Switch Module, Analog Cluster Illumination, Instrument Illumination 4 — Not Used 5 — Not Used 6 15 Rear Quarter Windows (LH and RH) 7 15 High Mounted Stoplamp, Brake Shift Interlock 8 25 Subwoofer, JBL Amplifier 9 10 Park and Turn Lamps, Side Marker Lamps, License Lamps, Stop Lamps 10 2 High Beam Indicator Electronic Cluster 11 15 Park Lamps 12 10 Remote Radio, Auxiliary Warning Lamp Module, Remote Keyless Entry (RKE) Module, Anti-Theft Controller Module, Radio Illumination 13 15 Radio, CD Disc Changer 14 5 Electronic Chromatic Mirror, Analog Cluster Indicator Lamps, Air Bag Module 15 — Not Used 16 15 Horns, Horn Relay Coil 17 15 Fog Lamps 18 25 Front Wiper Motor, Front Washer Pump, Wiper/Washer Relays 19 10 Generic Electronic Module (Pin 57), Electronic Instrument Cluster 20 25 Integrated Relay Control Module, Ignition Coil 21 10 Air Bag Module, Rear Window Defrost Relay, A/C Clutch, Temp Blend Door Actuator, Brake Shift Interlock 22 20 Rear Cigar Lighter, Power Plug 23 15 Multi-Function Switch 24 20 Rear Wiper Motor, Rear Washer Pump 25 10 Turn Signal Lamps, Instrument Cluster Turn Indicator 26 15 LH Aero Headlamp, Left and Right Trailer Stop/Turn/Hazard 27 15 Hazard Warning Lamps, Instrument Cluster Turn Indicator 28 15 Instrument Panel Cigar Lighter 29 15 Battery Saver Relay, Interior Lamp Control Relay, Interior Lamps, RH and LH Keyhole Lamps 30 25 Backup Lamps, Electronic Cluster 31 10 Rear Air Suspension 32 15 RH Aero Headlamp, Trailer Park Lamps 33 15 Anti-Lock Brake (ABS) Relay, Anti-Lock Brake (ABS) Module, Daytime Running Lamp (DRL) Module 34 30 One Touch Relay, LH Window Motor 35 15 Anti-Theft Controller Module 36 30 A/C Mode Switch 37 20 Door Lock Actuators, Memory Door Lock Relay 38 15 Heated Mirrors (LH and RH) 39 30 Auxiliary Blower Motor, Ref. Valve Solenoid 40 30 Window Motor (RH) 41 5 Autolamp Relay Coils, Autolamp Sensor 42 — — 43 — — 44 — —

    Mar 15, 2009 | 1997 Ford Windstar

    3 Answers

    Head Lights go dim, instrument panel goes dim when I turn on my Headlights


    Does it go completely black or just dim? Most displays dim when you turn the lights on to make the display darker so its not too bright. GPS and other displays do this. Do you have any problems with any other of the car's electronics?

    Oct 16, 2008 | 2004 Saturn VUE

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