Question about 1999 Oldsmobile Silhouette

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Headlights won't come on. HVAC and Instrument

Headlights won't come on. HVAC and Instrument panel dimmer swich both seem to work well. I am on vacation in Galena, IL and must drive home on Friday ... approx 12 hours.

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Check all wiring under the hood and check the shortstop fuse located in the main fuse panel should be metal or thicker than the other fuses if that doesnt fix check the relay

Posted on Jul 15, 2009

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Posted on Jan 02, 2017

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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

2 Answers

How change dimmer switch 2005pontiac grand Prix


best left to a dealer since it is inside the steering colum with all the other stuff .

Mar 07, 2015 | 2005 Pontiac Grand Prix

1 Answer

1994 silverado illumination on instrument panel doesn't work, parking lights and tail lights do not work but headlights and brakelights work fine. All fuses are good. Is this a bad dimmer switch?


No. Dash lights being out could be a bad headlight switch, since the dash lights are routed through the headlight switch, not the dimmer switch. Park and tail lights also controlled by the headlight switch.

Oct 23, 2012 | Chevrolet Cars & Trucks

1 Answer

Instrument Panel goes on and off, as do headlights


You have to remove the panel to check onthe connections behind it, also check the headlights switch, they tend to burn out.

Jul 25, 2009 | 1997 Jeep Grand Cherokee

1 Answer

No instrument panel lights


Have u tested the dimmer switch for the instrument panel lites? it is near the hd lite switch, they are a common cause of the problem, very common, also have found that allot of folks don't know there dimmer is trurned off.

Dec 13, 2008 | 1995 Mercury Sable

1 Answer

No instrument panel lights on 1995 Nissan King Cab


Ye, the dimmer switch still works.

I know this because, when I turn on the left direction flasher, the panel lights pulse dimly on and off with the direction light flasher.

Do I have a defective direction light flasher? if so where is it located?

Nov 24, 2008 | 1995 Nissan King Cab

2 Answers

1994 gmc safari


Hi there,

When you say you 'lose instrument panel', does that mean instrument panel lighting or the gauges go dead?

When you flip off the headlights, does the instrument panel come back? If it does, forget the fuse box.

If it's the instrument lighting, I'd be looking at headlight switch itself. In Safari's, the headlight switch and panel dimmer switch reside in one assembly. Coincidence? I think not.

I recommend replacing the switch. You can find one at a salvage yard for $5.00.

When you do the replacement, inspect the plugs and wiring attached to the old one for anything suspicious (loose wires, frayed insulation, bare wire, charred wire, etc.)

Let me know how it turns out.
Good luck,

If this works out for you, please take a sec and rate my solution.

Thanks
Mike

Jul 09, 2008 | 1994 GMC Safari

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