Question about 1981 Chevrolet Corvette

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1981 corvette instrument panel lamp replacement

I need to replace instrument lamps, in particular the indicator lamps. I need instruction on how to access them.

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I'll tell you, but when you go to do it, you'll probably curse Chevrolet, your car, and me! lol!

You have to reach behind the dash. Even with the seat in the back position, you'll turn into a contortionist! Place an old couch cushion, or something similar on the ground/driveway next to the car, with the door open. Kneel on the couch cushion. Reach up under the dash, and back behind it, with your left hand, while holding onto the steering column with your right.

It's hard to describe this to someone who has never done this before. (Just think. You'll be the expert, when someone you know asks you, when you're done!)

You are feeling for a plastic bulb holder. This holder is about the size of a dime. It resembles one of a gas stove's knobs. It has a round base, and from the middle of the base, it comes up into rectangular shape. If you look at this -> T <- the base is the top of the T. Turn the T upside down, and you'll have the basic shape.

This plastic holder has the lamp bulb in it. You turn it to the RIGHT.
As you face the instrument cluster, it is turned to the Right. You just turn it one quarter turn, then it will come out.
Once you get one in your hand, you'll know why it was difficult to describe. You'll also immediately see how it turns in, and locks into place.

The bulb itself it extracted, by holding the bulb holder in your hand, bulb facing you. You push in, and turn the bulb to the Left.
It is at this point, that I advise you to wear some protective gloves of some kind. The bulb base, could be corroded down in the socket. You may exert enough force to break the bulb, and cut your fingers.
I advise Safety above ALL ELSE!

I also advise that you replace one bulb at a time.
Notice the brass metal ring around the bulb holder base?
This corrodes after time, giving a poor contact. You can take a little fine steel wool, and clean it up. Use care as the steel wool can catch, and bend the brass ring, misshaping it.

Behind the dash panel that you can't see, is a thin plastic flat strip.
Another thing hard to describe. Envision a large U shaped flat piece of plastic, on the back of your instrument housing. The U shape will be upside down, in relation to how it sits on the back of the instrument housing. It's about 1/32nd of an inch thick, and about 2 inches wide.

There are thin flat strips of copper, making a path all the way around this strip. There are holes in this strip, for the various lamp bulbs. The flat copper strips go around these holes, making a connection to the bulb holder. That's what that brass ring on the bulb holder contacts, when it's screwed in.

Posted on Apr 18, 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 ?

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1 Answer

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

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1 Answer

Which fuse is for the instrument panel back lighting?


Does the radio play ? Are any other back lighting components not lighting ? Does the HVAC control panel light up ? You probably need new radio !
The second interior lighting group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination, LED illumination and incandescent lamps.
When the ignition switch is turned to the RUN position, the radio VF display turns ON at maximum brightness. When the park lamps are ON, all incandescent and LED back lighting turn ON at the dimming level indicated by the instrument panel (I/P) dimmer switch. At the same time all VF displays dim to match the indicated dimming level. The panel dimmer switch potentiometer is an input to the body control module (BCM). When the driver selects a dimming setting by moving the I/P dimming switch potentiometer, all incandescent back lighting lamps are provided with a specific voltage. When the I/P dimmer switch is moved from MIN to MAX, all VF displays, as well as all incandescent back lighting respond from minimum intensity to maximum brightness in response to the I/P dimmer switch.

Dose

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Why does the all-wheel drive keep disengaging when you need it?


Is the All-Wheel Drive Disabled Indicator on ?
An ABS DTC may cause the AWD Disabled light to illuminate. Check for ABS DTCs if no AWD fault is present.


?€¢
The AWD data list can be used to assist in determining which type of fault is causing the AWD Disabled Lamp to illuminate. with a scan tool, verify the above data displays are within specification.
?‡'
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?‡'
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?€¢
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?€¢
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?€¢
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I have a 1988 vette, my dash cluster lights went out, not a fuse, then the turn and high beam indicators are lit, and stay lit. The turn lamps do blink when I move the indicator. I can see the digital...


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1 Answer

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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 — —

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Headlights. sensor


You could replace the sensor or try disconnecting the DRL control module .What relay was replaced ? I see no relay on wiring diagrams or in service info. Replacing the Daytime Running Lamp (DRL) Ambient Light Sensor isn't hard . Just take the top dash pad off ,easy .
Removal Procedure
Remove the instrument panel (IP) upper trim. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gages and Console.
Remove the security system LED. Refer to LED Indicator Replacement - Vehicle Security System in Theft Deterrent.
Twist the DRL sensor counterclockwise in order to remove the sensor from the IP upper trim.
Remove the DRL sensor from the wiring harness.

Removal Procedure
Remove the windshield garnish molding. Refer to Windshield Pillar Garnish Molding Replacement in Interior Trim.
Important: Remove the upper trim panel slowly, the retainer clips could possibly fall into the instrument panel.
Lift the instrument panel (IP) upper trim panel approximately 51 mm (2 in) and pull rearward to release the retainers.
Remove the DRL ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement in Lighting Systems.
If equipped, remove the sun load sensor.

Pull the windshield garnish molding from the A-pillar in order to disengage the retaining tabs and clips.
Remove the windshield garnish molding from the A-pillar.

Daytime Running Lamps (DRL) Control Module
Left side of the IP

Removal Procedure
Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
Remove the instrument panel insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gages and Console.
Slide the daytime running lamp module from the bracket.
Disconnect the electrical connectors.

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