Cruise Control inoperative?

Tiny
RCH
  • MEMBER
  • 2001 GMC SIERRA
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 70,500 MILES
Cruise control will not work at all, not even the indicator light. When I pulled the connector on the cruise control module and checked for voltage pin 'g' 'LT Blue' wire does not indicate voltage with or without brake pedal pushed.
Saturday, November 22nd, 2025 AT 10:31 AM

10 Replies

Tiny
KRAKENAUTO
  • MECHANIC
  • 69 POSTS
Are there any other dash lights on at all ex. Abs, traction control etc.
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Saturday, November 22nd, 2025 AT 5:44 PM
Tiny
RCH
  • MEMBER
  • 5 POSTS
No warning lights at all.
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Saturday, November 22nd, 2025 AT 5:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
The voltage from the ltblue wire come through the brake light switch as a separate circuit and two fuses, (STOP LPS and VEH STOP) both in the under hoor fuse panel, if both fuses are good, see if the ltblue wire has power when the brake light is pushed and if not I would replace the bake light switch. Here is the cruise control wiring diagrams so you can see how the system works. Check out the images (below). Let us know how it goes
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Sunday, November 23rd, 2025 AT 9:37 AM
Tiny
RCH
  • MEMBER
  • 5 POSTS
Thanks for the electrical schematic. If their was 2 pages I only got 1page. If not the bottom was cut off.
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Monday, November 24th, 2025 AT 10:19 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Sorry about that, here is the other half. Did you find where you were losing power to the module?
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Tuesday, November 25th, 2025 AT 9:05 AM
Tiny
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  • MEMBER
  • 5 POSTS
Thanks Ken L, Will be working on that this afternoon. Will get back to you. Bob
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Tuesday, November 25th, 2025 AT 11:18 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
No problem Bob, I would check the brake light switch first :)
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Wednesday, November 26th, 2025 AT 9:57 AM
Tiny
RCH
  • MEMBER
  • 5 POSTS
Just replaced the brake switch, no change at pin g on cc module. I'm taking tomorrow off. Have a great Thanksgiving
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Wednesday, November 26th, 2025 AT 2:46 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Sounds good, I would check the brown and ltblue wire for power at the CC module when the brake pedal is depressed. This can help eliminate this part of the system, have a good thanksgiving see you when you get back :)
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Thursday, November 27th, 2025 AT 12:09 PM

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