2002 Chevrolet Suburban No Brake Lights

Tiny
MIKELWC
  • MEMBER
  • 2002 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
I currently have no brake lights! I have checked the fuses with a digital multimeter and they are good. I have replaced the brake light switch. My cruse control works just fine. My turn signals work just fine. If I use the trailed brake controllers manual switch the third brake light comes on. What do I check next?
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Monday, January 20th, 2014 AT 10:12 AM

15 Replies

Tiny
SATURNTECH9
  • EXPERT
Have you checked to see if you have power to the brake light bulbs when stepping on the brakes?Also you mentioned trailer lights did you install diodes on your brake circuit?I have seen them fail and cause the same thing to happen.
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Monday, January 20th, 2014 AT 11:07 AM
Tiny
MIKELWC
  • MEMBER
When I step on the brake peddle there is no power to the rear bulb connectors.

Before this happened, when I stepped on the brake the trailer brake controller would light the digital readout. Now nothing.

The controller was installed using the correct pigtail to connect into the wiring harness junction box.
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-1
Monday, January 20th, 2014 AT 1:21 PM
Tiny
SATURNTECH9
  • EXPERT
Sorry I was having trouble logging into my online repair manual. Lets start form the beginning of the circuit. With the brake pedal pushed see if the white coming out of the switch has power?
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Tuesday, January 21st, 2014 AT 10:50 AM
Tiny
SATURNTECH9
  • EXPERT
Also while stepping on the brakes or just do this instead at the underhood fuse box see if the chmsl and veh stop fuse has power across both sides of those fuses while stepping on the brakes?
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Tuesday, January 21st, 2014 AT 10:53 AM
Tiny
MIKELWC
  • MEMBER
Chmsl fuse has 45.3mv on one side and 2.3mv on the other. The veh stop fuse has 2.3mv on both sides.
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Tuesday, January 21st, 2014 AT 11:51 AM
Tiny
SATURNTECH9
  • EXPERT
Now go to the brake switch see if the orange wire to the brake light switch has battery voltage to it?Also if the white wire coming out of the switch has battery voltage while stepping on the brakes?
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Tuesday, January 21st, 2014 AT 12:03 PM
Tiny
MIKELWC
  • MEMBER
There is no steady voltage on the orange or white wires. The voltage is jumping around in the mv range.
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Tuesday, January 21st, 2014 AT 12:16 PM
Tiny
SATURNTECH9
  • EXPERT
Now go to the underhood fuse by the battery and see if the stop lps fuse has battery voltage on both sides of it?
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Tuesday, January 21st, 2014 AT 12:24 PM
Tiny
MIKELWC
  • MEMBER
Stop lps fuse had battery voltage on only one side. Checked fuse and it was blown! Replaced fuse and now have brake lights but no third brake light or readout on the trailer brake controller.
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Tuesday, January 21st, 2014 AT 12:41 PM
Tiny
SATURNTECH9
  • EXPERT
Alright stepping on the brakes does the chmsl fuse in the underhood fuse box have power to both sides of it?
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Tuesday, January 21st, 2014 AT 12:56 PM
Tiny
MIKELWC
  • MEMBER
Chmsl fuse was also blown! Replaced it and now have ALL of my lights!

Thank you!
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Tuesday, January 21st, 2014 AT 1:02 PM
Tiny
SATURNTECH9
  • EXPERT
Make sure your trailer wiring matches your truck that could be blowing the fuses.
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Tuesday, January 21st, 2014 AT 1:08 PM
Tiny
SATURNTECH9
  • EXPERT
Also glad I could help you.
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Tuesday, January 21st, 2014 AT 1:09 PM
Tiny
MIKELWC
  • MEMBER
I have been towing this trailer for several years with no problem, until now.

I will check and see if something may have shorted a wire.

Thanks again and have a great day! Mikel
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Tuesday, January 21st, 2014 AT 1:12 PM
Tiny
SATURNTECH9
  • EXPERT
Your welcome glad I could help.
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Tuesday, January 21st, 2014 AT 1:13 PM

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