2005 silverado 1500 brake lights

[1badmonkey]

My dad-in-law has an 05 silverado, the brake lights in the bed dont work, but the cab mount light does. all the other functions of the bulbs work fine, and the bulbs have been replaced.

there is a module under the bed, could that be the issue?


thanks guys!

charles

[IRONHEAD]

Re: 2005 silverado 1500 brake lights

there is a circuit board for the lights somewhere..
p.m. spidy..
or min

[SpiderGearsMan]

Re: 2005 silverado 1500 brake lights

circuit board is in the lights
they puke stop lamp switches a lot

[squirrel]

Re: 2005 silverado 1500 brake lights

could it be the turn signal switch? I guess troubleshooting is what you need to do....lotsa possible failure points. And they have mutiplexing on the newer ones...when did that start?

[redragtop]

Re: 2005 silverado 1500 brake lights

We've had lots of problems with taillight sockets/circuit boards. Power gets to light assembly but not bulb itself. Would be first place to check and then move to switch, fuse, wiring, etc. if "socket" tests good

[SpiderGearsMan]

Re: 2005 silverado 1500 brake lights

Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
Observe the stop lamps while pressing the brake pedal.

Does the system operate normally?
Go to Testing for Electrical Intermittents in Wiring Systems
Go to Step 3

3
Are all the stop lamps inoperative?
Go to Step 6
Go to Step 4

4
Test the supply voltage circuit of the inoperative lamp for high resistance, an open, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 12
Go to Step 5

5
Test the ground circuit of the inoperative lamp for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 12
Go to Step 8

6
Test the battery positive circuit of the stop lamp switch for high resistance, an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 12
Go to Step 7

7
Test the stop lamp switch signal circuit of the stop lamp switch for a short to ground, high resistance or an open. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 12
Go to Step 9

8
Inspect for poor connections at the harness connector of the bulb or high mount stop lamp. 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 12
Go to Step 10

9
Inspect for poor connections at the harness connector of the 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 12
Go to Step 11

10
Replace the stop lamp. Refer to Tail/Turn Signal Lamp Replacement or High Mount Stop Lamp Replacement .

Did you complete the replacement?
Go to Step 12
--

11
Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement .

Did you complete the replacement?
Go to Step 12
--

12
Operate the system in order to verify the repair.

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

[1badmonkey]

Re: 2005 silverado 1500 brake lights

that check list is awesome!! I havent torn the column apart yet to mess with the multifunction switch, which seems to be what the issue is most of the time, according to my "firewall acceptable" search today at work.

I was kinda hoping several of you guys would have had this crappy issue!! lazy me...

thanks guys will post this week end, after i tear into the column....

[min301]

Re: 2005 silverado 1500 brake lights

that check list is awesome!! I havent torn the column apart yet to mess with the multifunction switch, which seems to be what the issue is most of the time, according to my "firewall acceptable" search today at work.

I was kinda hoping several of you guys would have had this crappy issue!! lazy me...

thanks guys will post this week end, after i tear into the column....

Or multimalfunction switch...as the case may be. ;D

[1badmonkey]

Re: 2005 silverado 1500 brake lights

no kidding. it's crazy that everything goes through that switch.

the truck only has 30,000 miles on it too.

[SpiderGearsMan]

Re: 2005 silverado 1500 brake lights

out of warranty though

[1badmonkey]

Re: 2005 silverado 1500 brake lights

Well, it isnt the multi-function switch. that would leave that module under the bed maybe.

fuse(s) are good
bulbs are good.
hazards flash
high mount light in the cab works, just not the brake lights in the bed... or the trailer connector

[TC]

Re: 2005 silverado 1500 brake lights

could it be the turn signal switch? I guess troubleshooting is what you need to do....lotsa possible failure points. And they have mutiplexing on the newer ones...when did that start?

Bam, I just troubleshooted an S10 with the same problem. Ended up being the turn signal switch.