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Mazda Ed
Mazda Ed, Auto Service Technician
Category: Chevy
Satisfied Customers: 2223
Experience:  ASE Master Technician, Mazda Master Technician, GM and Ford factory trained. 15 years experience.
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My 2001 Chevy Impala has lost all instrument panel lights, ...

Resolved Question:

My 2001 Chevy Impala has lost all instrument panel lights, Steering wheel lights, door lights, shifter leaver lights at night. The Odometer, Radio and Temperatures/MPG Displays are too dim to read at night. They are good during the day. Where do I begin to look for the problem
Submitted: 6 years ago.
Category: Chevy
Expert:  Mazda Ed replied 6 years ago.

HiCustomer

At the risk of sounding like a jerk... I want you to try adjusting the dimmer switch first. I have had several people with problems very similar to yours where the end result was the dimmer was adjusted all the way down.

Now, if you adjusted the dimmer up and it still does not work I can step you through testing the lighting system if you have a meter or test light.

Mazda Ed, Auto Service Technician
Category: Chevy
Satisfied Customers: 2223
Experience: ASE Master Technician, Mazda Master Technician, GM and Ford factory trained. 15 years experience.
Mazda Ed and 2 other Chevy Specialists are ready to help you
Customer: replied 6 years ago.
Reply to Mazda Ed's Post: The dimmer switch has been adjusted several times
and has absolutely no affect on the lights.
Expert:  Mazda Ed replied 6 years ago.
Ok, will you be using a test light or a meter to check the circuits?
Customer: replied 6 years ago.
Reply to Mazda Ed's Post: A meter
Expert:  Mazda Ed replied 6 years ago.

Ok, for starters check both legs of the INST LPS fuse located in the passenger side instrument panel fuse block. You should have battery voltage on both legs with the parking lights turned on.

Let me know the results of that test so we can continue on.

 

Customer: replied 6 years ago.
Reply to Mazda Ed's Post:

I don't have an INST LPS Fuse on the Passenger side instrument panel fuse block.

I do have a FRT PARK LP Fuse (Front Parking Lights, Instrumentation Lighting)

I cheked this fuse with the Parking Lights on and both sides have 12V to Ground.

Expert:  Mazda Ed replied 6 years ago.

Ok, I believe you are in the passenger side "underhood" box... not the "instrument panel" box. Under the hood is where you will find the PARK LPS fuse and relay.

On the passenger side of the instrument panel it should look like this:

Object Number: 770279  Size: MF

Customer: replied 6 years ago.

I am in the Passenger Side instrument panel Fuse Box. Next to the glove box

inside the Passenger Side Door. It doesn't look anything like the image you sent.

It looks like thisgraphic

Expert:  Mazda Ed replied 6 years ago.

Ok, sorry for the confusion. I just completely logged out of my GM schematics and started over from the beginning.

Passenger side - Check for power on both sides of the REAR PRK LP fuse.

Driver side - Check for power on both sides of the STR COL fuse.

Make sure the parking lights are turned on at the switch when doing this testing. Also, please verify if all exterior lights are working.

Customer: replied 6 years ago.

Rear PRK LP Fuse has 12V on both sides to Ground

STR COL I get nothing on both sides of the fuse

All exterior lights are working

Expert:  Mazda Ed replied 6 years ago.

Procedure for accessing the connector is shown below.

Ok, at the headlight switch test the Brown/White (terminal S) wire for battery voltage when the lights are turned on.

Then check for variable voltage on Gray (terminal J) wire with lights turned on and moving dimmer switch.

If you have power on Brown/White but not on Gray then the switch is bad.

If you have no power on Brown/White then the wire is bad from the fuse to the switch.

Headlamp Switch


Object Number: 283847  Size: CH

Connector Part Information

  • 12129431
  • 16-Way F Metri-Pack 280 ACT Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

1251

Ground

B-C

--

--

Not Used

D

YEL

10

Headlamp Switch Signal

E

BLK/WHT

1251

Ground

F

--

--

Not Used

G

LT BLU

74

Park Lamp Switch Signal

H

--

--

Not Used

J

GRY

8

Instrument Panel Lamp Supply Voltage - 1

K-L

--

--

Not Used

M

DK BLU

/WHT

1495

Courtesy Lamp Switch Signal

N

BLK/WHT

1251

Ground

P

BLK

1050

Ground

R

GRY

8

Instrument Panel Lamp Supply Voltage - 1

S

BRN/WHT

301

Park Lamp Switch On Signal

 

Headlamp Switch Replacement

Removal Procedure


    Object Number: 575129  Size: SH

  1. Remove the instrument panel cluster trim plate bezel.
  2. Remove the screws from the headlamp switch housing.
  3. Remove the headlamp switch housing from the instrument panel.
  4. Disconnect the electrical connector from the headlamp switch.
  5. Disconnect the electrical connector from the foglamp switch.
  6. Remove the foglamp switch from the headlamp switch housing, using a small flat bladed tool.

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