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Doesnanyone have a diagram showing where the wires on a speedometer connect to? I need to see if i pulled it on accident. And fuel gauge. Im learning so pictures are easier. Thx 2001 chevy tahoe

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  • Jeff Armer Apr 30, 2017

    You have no clue do ya .

  • Jeff Armer Apr 30, 2017

    Buy a repair manual !

  • Michelle Dubois
    Michelle Dubois May 01, 2017

    Lol. It's like 30 bucks! For a manual. I have some what of a clue. I'm gonna be very very careful not to unplug or Break any wires while I check.

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  • Cars & Trucks Master
  • 11,010 Answers

The speedometer gauge is controlled by information sent over the class 2 data bus from the PCM/ECM - engine computer . There is a VSS - vehicle speed sensor mounted on the transmission , this VSS is a input to the engine computer .
Speedometer
The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The IPC- instrument panel cluster receives the vehicle speed signal via a discreet wire. The IPC uses the vehicle speed signal circuit (4000 pulses/mile) from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit (4000 pulses/mile) exists.
Is the whole instrument cluster dead ?
Fuel Gauge
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gauge defaults to empty if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.
Reviewing the fuel system description will further explain how the system functions. Refer to:
• Fuel System Description in Engine Controls - 4.3 L
• Fuel System Description in Engine Controls - 4.8 L, 5.3 L and 6.0 L
• Fuel System Description in Engine Controls - 6.6 L
• Fuel System Description in Engine Controls - 8.1 L
Hourmeter
The IPC can display the accumulated engine run time hours using the VF display when the cluster is in the LOCK or ACC position. The IPC stores the accumulated engine run time hours in a non-volatile format. The accumulated hours will not change if the battery was disconnected or removed. When the ignition is OFF and the trip reset switch is pushed in and held for more than 4 seconds, the IPC will display the accumulated hours for 30 seconds. The hourmeter will reset to 0.0 when 10,000 hours are accumulated.
Odometer
The IPC contains a season odometer and a trip odometer. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the IPC. The IPC calculates the mileage based on the vehicle speed signal circuit from the PCM. The odometer will display 'error' if an internal IPC memory failure is detected. The odometer can be configured to display either miles or kilometers.
PRNDL Display
The IPC displays the selected gear position as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the gear position. The PRNDL display blanks if:
• The PCM detects a malfunction in the transmission range switch circuit.
• The IPC receives a class 2 message indicating the park position and the column park switch indicates a position other than park (open input).
• The IPC detects a loss of class 2 communications with the PCM.
GM had problems with stepper motors that control the needle position .
Your best bet buy a used instrument cluster from the auto slavage yard .

Posted on Apr 30, 2017

Testimonial: "What? Yes I read the whole message and what? Thank you for the definitions pulled from a book, I'm just asking if any one had a visual diagram of the wiring. From the speedometer cluster wired hook plunhook up to where so I can check if I damaged something. Thank you"

  • 7 more comments 
  • Jeff Armer Apr 30, 2017

    Instrument cluster ! And if your so intent on screwing up your vehicle you can find wiring diagrams herehttp://www.bbbind.com/free_tsb.html
    The so called definitions pulled from a book are factory service inforamtion discriptions of how the electronic work on this vehicle . I posted it to discourage you from messing with things you probably have never delt with . Messing with the class 2 serial data network can cause your vehicle to be useless .

  • Jeff Armer Apr 30, 2017

    The junk yards are full of vehicles from people that though they could fix there cars ! I have been in the auto repair business over thrity years . Last twenty at a Chevy , Cadillac , Buick dealer . People bring them to use after they mess them up .

  • Michelle Dubois
    Michelle Dubois Apr 30, 2017

    I was not trying to be mean or un grateful. I was just stating that I have looked up this and it's written with all technical words. PCM VSS IPC. I Know there short abbreviations. And I don't doubt your knowledge. I'm grateful you responded. I wrote back without reading what I wrote and trust me if you heard how I say it out loud you would laugh. And I won't screw up anymore than what's already been done. I was told to solder if needed and stuff. First I just wanted to see if it's possible just a simple wire I might have broken. There's like 50 different wires from the last owner of the vehicles stereo system still all intertwined in the dash so finding which wire I need to follow is confusing, I looked to see if it was a fuse but im not sure which one it is in the box drivers idea so I check them all. I'm sorry if I upset you, I did not mean to. Im actually the nivest and coolest lady ever. Michelle D

  • Jeff Armer May 01, 2017

    You can find wiring diagrams athttp://www.bbbind.com/free_tsb.html copy and paste this in your browser !

    Enter your vehicle info. make , model , year an engine size . Under system click on Body & Accessories , then under subsystem click on Instrumentation . Click the search button , then on the blue link . You will be able to view wiring diagrams for the entire vehicle.

    If you need help on how to solder there are videos on youtube ! Plus videos on automotive electrical trouble shooting etc..

  • Jeff Armer May 01, 2017

    The one wire you really need to pay close attention to is the class 2 serial data bus wire , this connects all the modules on the vehicle , so they can talk with each other . If this wire were to become shorted to ground nothing on your vehicle is going to work correctly .

  • Michelle Dubois
    Michelle Dubois May 01, 2017

    Thank you so much. I'm just about to take the front panel off (where the speedometer is) and I will be careful.

  • Michelle Dubois
    Michelle Dubois May 01, 2017

    So dont touch that class 2 serial data bus wire. Ok. Soooo is it a black wire that controls all the others to not short out?

  • Michelle Dubois
    Michelle Dubois May 02, 2017

    Jeff Armer you're never going to guess I fixed it! I did take off the panel and checked everything and I remembered reading something about a guys radio what down and hebplayed with it and then all the gadgets and stuff that he broke we're the same as mine so after I did 3 hours of checking wires and inside the case thing that holds the speedometer and gadges ( I forgot what that is called) ;) I checked the fuses for the radio. Fuse #15 under the hood and the fuse #10 on the driver's side box. Sure enough both were burned out. So I took the spare fuse #10 and #15 new and put them in and Shazam everything works! Well I still have to check the speedometer. I just need to take it for a spin. But I can see my PRND and my fuel gauge moving (hopefully where it is suppose to be) Yeah! I told you I could fix it. :) Now im going for a spin to the store. Im crossing my toes!

  • Jeff Armer May 02, 2017

    Good ! Fuse # 15 , 10 amp under the hood powers the BCM , Instrument cluster an the automatic day night .The # 10 fuse driver fuse panel is for the trailer turn fuse . You said the wiring for the radio is all unhooked ? It's all cut , not in a connector ? There is a wire , Dark green with a white stripe , this is for vehicle speed info to the radio . if this wire is touching ground it would cause a speedometer issue.

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