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Wiring diagram instrument panel

Wiring schematics for dimmer switch

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Posted on Dec 28, 2013

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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

2006 Chevy express 2500 instrument panel lights stopped working after two wires touched going to tow switch. No blown fuses


Which I/P lights ? Instrument cluster , radio , HVAC control panel etc.... All the I/P light's are controlled by the BCM - body control module . Do you know about electronic control modules ?
DTC B2610 Passenger Compartment Dimming 1 Circuit
The body control module (BCM) receives a variable voltage signal from the instrument panel (I/P) dimmer switch requesting to illuminate the instrument panel controls illumination lamps to a desired intensity. When this occurs, the BCM directly sends a variable voltage based on the I/P dimmer switch position on the backlight lamps control circuit, instrument panel lamps dimming control circuit, and the LED dimming signal circuit.
Voltage for the backlight lamps control circuit, instrument panel lamps dimming control circuit, and the LED dimming signal circuits is from the TBC 3 fuse 16 in the underhood fuse block directly through the BCM to these circuits.

• Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
• A short to ground in the following circuits will cause the TBC 3 fuse to open:
- The backlight lamps control
- The instrument panel lamps dimming control
- The LED dimming signal
- Battery positive voltage from the underhood fuse block TBC 3 fuse
• An open in the TBC 3 fuse will cause the BCM to set the following DTC:
- B0951
- B2610
- B2625

DTC B2615 Passenger Compartment Dimming 2 Circuit
DTC B2620 Display Dimming Pulse Width Modulation (PWM) Input Circuit
DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit
Do you know how to Test for a high resistance, an open, a short to ground, or a short to voltage in the following circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
• 5-volt reference
• The dimming input
• The dimming return

Tow/Haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) or transmission control module (TCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again disables tow/haul mode and returns the transmission to a normal shift pattern.

After reading all the pertinent info. to your problem, doing testing ,Checking for DTC'S -diagnostic trouble codes in the BCM , checking power and ground's for the BCM an checking voltage at the tow / haul switch to and from the BCM .is where i would start . Do you know how to do electrical testing ? Read a wire diagram ? If not there are videos on youtube for learning how to do basic automotive electrical testing , how to read wiring diagrams etc... You can find free wiring diagrams at
http://www.bbbind.com/free_tsb.html The only thing with this is you don't have info. saying where componet location's are . This is were factory service info would be helpful

Jan 04, 2017 | Cars & Trucks

1 Answer

2003 Pontiac Vibe no tail lights, brake lights and turn signals work just fine. The dimmer switch does not dim the dash lights but does work the dome just fineand the lights for the Heat/AC are off.


The tail lights work off the headlight switch, and there is a fuse for the tail lights. Make sure the fuse is good, first, a 15 amp (blue) fuse in the instrument panel fuse block. Then, you might have a bad headlight switch.
So you DO have dash lights, they just don't dim from the dimmer switch? In the wiring diagram, there is a green wire from a "tail light relay" (in the "Junction Block-Right Instrument Panel") that carries power to all the exterior lamps, as well as having a splice to the Instrument Panel Cluster (illum. bulbs), and to the lamp dimmer, and to the radio bulb.
To do any further testing, you would need a voltmeter or a test light, so you could chase down this power loss. Good luck.

Oct 17, 2016 | 2003 Pontiac Vibe

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

How do I remove the instrument cluster dimmer switch in my 2000 Lincoln town car


Switch - Panel Dimmer
Special Tool(s) syg~tr~en~file=st1445a.gif~gen~ref.gif Radio Removing Tool
T87P-19061-A Removal
  1. Disconnect the battery ground cable
  2. Pull out the radio using Radio Removing Tool.
  3. Remove the radio.
    1. Disconnect the electrical connectors.
    1. Disconnect the antenna cable.
    1. Remove the radio.
    2. Remove the instrument panel finish panel bolts.
    3. Remove the instrument cluster finish panel bolts.
    4. Pull out and position aside the instrument cluster finish panel.
    5. Disconnect the electric clock electrical connector.
    6. Remove the instrument cluster finish panel.
      1. Disconnect the headlight switch electrical connector.
      1. Disconnect the dimmer switch electrical connector.
      1. Remove the instrument cluster finish panel.
      2. Remove the dimmer switch.
        1. Remove the screws.
        1. Remove the dimmer switch.
    7. Installation
      1. NOTE: When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 mi) or more to relearn the strategy.
        To install, reverse the removal procedure.

Nov 29, 2015 | Lincoln Cars & Trucks

1 Answer

Wiring diagram for a 1994 olds cutlass supreme instrument lights


Power comes from headlamp / dimmer switch . Go here for free wiring diagrams http://bbbind.com/free_tsb.html Enter vehicle info year ,make , model ,engine size ! Under system click on lighting then under subsystem click interior light dimming .

Oct 04, 2014 | 1994 Oldsmobile Cutlass Supreme

1 Answer

Dash wiring


The dimmer switch is solid state and uses the black wire for ground. The wiring diagram shows a red and black coming from the fuse and a red going to the dash lights. So you should be able to jumper the two reds to bypass the switch.
I would use a test light in the circuit to try it before you make it permanent.

Jul 20, 2013 | Honda Cars & Trucks

1 Answer

Fuses are fine but there is no power to the dimmer switch


I don't have a clear wiring diagram for just the dash lights, but it looks like the lights get power from the fuse and the dimmer switch provides the ground side of the circuit. American cars are the opposite.
So if you do not have power going into the dimmer I would look for a problem in the harness or the circuit board on the cluster.

May 08, 2013 | 1999 Mazda Protege

4 Answers

My a/c heater switch just went out on me. The blower works when I turn the fan on but I have no light on the control and I can't control the temperature. I purchased a new switch and the samething is...


hello sounds like u actually have two problems the switch that controls the lights is in the headlight/dimmer switch the problem with the temp control would be in the air door actuator motor replace motor and headlight switch will fix the problem ill be here if u need more info thank u and have a good day. josh

Feb 10, 2010 | 1999 Honda Accord

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