alright, flame me if'n ya want, but I got to ask, (I have searched) but I just picked up a 01 burban LS 5.3 with the 60 trans. >150k miles

primary objective: It's using the headlights as the dlr's. I have to hit the dome override 4x to get the headlights to shut off. (I don't want them to run all the time as I've put some silverstars or whatever they are called in and don't want to burn them up needlessly) it's got the bulbs where the dlr's (replaced them today) but I'll be damned if'n I can figure out how to get it to run them vs the headlights. any suggestions would be greatly appreciated (oh and I've checked the fuse it's good)

secondary objective: My tow/haul switch don't work. I've heard numerous reasons for why this could be. My pops (gm dealership parts counter) suggested checking the wiring down the column, I've had a couple of guys say it's likely the switch itself, and others yet say it's the whole lever.
now in park the lever is loose kinda as if the spring has lost some of it's spring... so I'm not sure if this is a factor. (lol) I'm not real eager to start pulling all the plastic out, but will, I just want to make sure when I do it I can go down the whole list of possibilities.

Many thanks!
:chug:

 

Welcome to the forums. I keep my headlights on all the time and run silverstars too. I also keep my recepts. Silverstars have a 1 year guarantee. The always blow within the year so i just return them and get a new set. Now they are good for another year. If you want yours to go off read your manual it should show you a way to do it. For me i have the auto headlights. I just pushed the sensor into the dash so its always dark. Maybe your sensor is knocked into your dash. Is there a hole by the defrost blower instead of a sensor dome?

 

well I can hit the dome override 4x to shut them off but they always come back on when the ignition is cycled. Sensor dome is still there, to the sensors have a tendency to go south???


:chug:

 

The NBS has a fuse for the DLRs that will disable them. Don't know if the GMT800s have a similar fuse or not.

 

fuse checked and verified good. seems to be a relay next to the fuse too :dunno:

:chug:

 

I misunderstood. Thought you were trying to defeat the DLRs.

 

check for a switch on the parking brake, if the switch is stuck it could be keeping them off... if I recall the DRL's go off if the parking brake is on....

 

will do! thanks for the suggestion... I noticed the other day when I tried to set the parking brake that there is no tension and the next morning I came out to a puddle under the truck... didn't seem to be brake fluid, but it could be so I'm going to have to get under it and check that out...

any suggestions as to how to test the light sensor on the dash to see if that will quit running the headlights non-stop?


:chug:

 

Service Information
2001 Chevrolet Chevy Suburban - 2WD | Sierra, Silverado, Suburban, Tahoe, Yukon (VIN C/K) Service Manual | Document ID: 646454
--------------------------------------------------------------------------------

Headlamps On in Daylight Conditions
Step
Action
Value(s)
Yes
No

Schematic Reference: Headlights Schematics

1
Did you perform the Lighting Systems Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Lighting Systems

2
Turn the headlamp switch to the OFF position.
Turn ON the ignition, with the engine OFF.
Cover and uncover the ambient light sensor.
Does the system operate normally?
--
Go to Testing for Electrical Intermittents in Wiring Systems
Go to Step 3

3
Turn ON the ignition with the engine OFF.
With the scan tool, read the ambient light sensor voltage in the BCM.
While monitoring the scan tool, cover the ambient light sensor, then induce a light source to the sensor.
Does the sensor voltage vary near the specified values?
Above 2.2 V, Below 1.3 V
Go to Step 4
Go to Step 10

4
Disconnect the headlamp relay.

Are the headlamps illuminated?
--
Go to Step 12
Go to Step 5

5
Reconnect the headlamp relay.
Disconnect the headlamp and panel dimmer switch connector.
Are the headlamps illuminated?
--
Go to Step 6
Go to Step 9

6
Disconnect the BCM connector C2.

Are the headlamps illuminated?
--
Go to Step 7
Go to Step 11

7
Test the headlamp relay coil supply voltage circuit of the headlamp relay for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 17
Go to Step 8

8
Inspect for poor connections at the headlamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 17
Go to Step 13

9
Inspect for poor connections at the headlamp and panel dimmer switch . Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 17
Go to Step 14

10
Inspect for poor connections at the ambient light sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 17
Go to Step 15

11
Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 17
Go to Step 4

12
Repair the short to voltage in the battery positive voltage circuit between the headlamp relay and the headlamps. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
--
Go to Step 17
--

13
Replace the headlamp relay.

Did you complete the replacement?
--
Go to Step 17
--

14
Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?
--
Go to Step 17
--

15
Replace the ambient light sensor. Refer to Ambient Light Sensor Replacement .

Did you complete the replacement?
--
Go to Step 17
--

16
Important: Perform the setup procedure for the BCM.

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?
--
Go to Step 17
--

17
Operate the system in order to verify the repair.

Did you correct the condition?
--
System OK
Go to Step 3

© 2011 General Motors Corporation. All rights reserved.

 

Service Information
2001 Chevrolet Chevy Suburban - 2WD | Sierra, Silverado, Suburban, Tahoe, Yukon (VIN C/K) Service Manual | Document ID: 743697
--------------------------------------------------------------------------------

Diagnostic System Check - Lighting Systems
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.

Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.

Checks for BCM DTCs.

The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

Step
Action
Yes
No

1
Install a scan tool.

Does the scan tool power up?
Go to Step 2
Go to Scan Tool Does Not Power Up in Data Link Communications

2
Turn ON the ignition, with the engine OFF.
Attempt to establish communication with the body control module (BCM).
Does the scan tool communicate with the BCM?
Go to Step 3
Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

3
Important:: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.

Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool.
Rotate the ignition switch through all positions while observing the Class 2 Power Mode on the Scan Tool. Refer to the Serial Data Power Mode table within Body Control System Description and Operation in Body Control System, for a list of the power mode states that correspond to each ignition switch position.
Does the ignition switch parameter reading match the ignition switch position for OFF, RUN, and CRANK?
Go to Step 4
Go to Power Mode Mismatch in Body Control System

4
Select the BCM display DTCs function on the scan tool.

Does the scan tool display any DTCs?
Go to Step 5
Go to Symptoms - Lighting Systems

5
Does the scan tool display any DTCs which begin with a "U"?
Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
Go to Diagnostic Trouble Code (DTC) List

© 2011 General Motors Corporation. All rights reserved.