Question about 1985 Chevrolet C1500

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I have 1985 Chev 3/4 ton Pickup.. No park lights, no dimmer interior light,no dash lights but do have head lights . I feel it is in switch ,,??? how do you get switch off back of dash??  no screw to hold  knob on....thanks  It is a Scotsdale 20

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  • geebeeman Apr 20, 2009

    Thank you,,.... then what holds switch to dash  thanks

  • geebeeman Apr 20, 2009

    Ah  got old one off and see how it  all works   thanks so much    A+++++++

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Press a release button at rear top of switch and knob and shaft come out

Posted on Apr 20, 2009

  • yadayada
    yadayada Apr 20, 2009

    there is a nut under the knob and shaft. Do u have the new switch? they are very cheap, less than $20, if u had that u would see how everything goes.

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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

92 roadmaster instrument lights


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.

Dec 02, 2016 | 1992 Buick Roadmaster

1 Answer

Have taillights but no brake lights or dash lights


Those are different unrelated circuits. The dash lights are from the Head/park light switch. Make sure the dimmer rheostat is not turned way down-you know, how you turn the knob for brighter or dimmer interior. If the bulbs are good on the backside of the cluster, it may be the switch.
The brake light switch is on the brake pedal. If no power to the switch, check the stop light fuse. I believe it may be same fuse as the hazard lights.

Nov 22, 2015 | 1986 Jeep Comanche

2 Answers

Dash lights on my 2004 buick rendezvous don't light up at night, can't find the fuse in the fuse box or under hood


I guess you could say there is no fuse for the dash lights.
The dimmer control on the headlight switch actually goes thru the body computer and the dash lights get their power from there. The body computer has several fuses involved. The other interior lights not controlled by the dimmer get power from the park lamp relay.

Jan 21, 2014 | Buick Rendezvous Cars & Trucks

1 Answer

1999 chryler concord interior light stays on


Do you have a dimmer switch for interior lights and dash lights that is turned all the way on? You may also be able to turn them all the way off. My chrysler is a van and the dimmer switch is a wheel that rolls vertically.

Dec 20, 2011 | 1999 Chrysler Concorde

1 Answer

When I closed the door in my 96 park avenue the interior lights and the over head light panel won't go off


Is the light dimmer on the headlight switch turned all the way clockwise? this dims or brightens dash lights, but turns interior lights on when maxed.

Nov 23, 2011 | Cars & Trucks

1 Answer

85 chevy 3/4 ton pick up .Rear brake light and turn singles dont work but parking lights work,fuse is ok brake switch is ok and front turn singles work as well as hazerds for the front only work and...


bad turn signal switch broken inside switch, need to remove steering wheel, remove clip, unplug connector under dash on column, undo the 3 screws hold switch in, install in reverse order.

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1 Answer

2009 Pontiac Vibe. Tonight my interior light


there is a side switch on the dome light it has 3 positions
OFF
DOOR
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make sure it is on the DOOR
not sure about the Vibe but most GM cars if you turn the dash light dimmer switch to far it will put on the dome light also
if both the switch and the dimmer are ok
then you have a short some were in that circuit
depending on the mileage it should still be under warranty
hope this helps

Jan 17, 2010 | 2004 Pontiac Vibe

1 Answer

1999 Mercury Sable Dome Light won't shut off


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good luck let me know what happens.

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