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No turn signals, brakes lights, hazard lights

Tiny
SANDCASTLE
  • MEMBER
  • 2005 FORD FREESTYLE
Turn signals flash in front and on instrument panel (very fast) and are audible, but not in back. Back brake lights don't work, but the high mount does. Hazard lights visible on instrument panel and audible, not not in back. Replaced the turn signal/brake/hazard lamps, but no change. Thanks.
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Saturday, January 6th, 2007 AT 3:10 PM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Hello,

The system has a couple of fuses and a relay that power the lights, here is a guide on what to look for when testing the system.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

My guess is the multi function switch is bad or the low voltage board.

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken
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Tuesday, June 27th, 2017 AT 4:22 PM
Tiny
PAUL BAKER2
  • MEMBER
  • 4 POSTS
I have same problem checked everything you suggested on diagram only thing odd is pins from sjb for brake/turn has constant 15 volt even with car off. Jumps to 17 when signal is on.
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Friday, November 3rd, 2017 AT 2:39 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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It sounds like the low current board could be out and needs to be replaced. Did you test through the switch?

Can you take a video of the test you are doing so I can see?
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Friday, November 3rd, 2017 AT 11:40 AM
Tiny
PAUL BAKER2
  • MEMBER
  • 4 POSTS
I swapped the sjb. Still doing same thing. I don't think I could video. I pulled c2280e checked voltage on sjb side pin 5 and 10 show voltage on meter constant and jumps when brake or turn signal applied. Pin 9 works like normal when brake applied. Also voltage dropped to 11 I jumps to 12 with brake apply on pin 5 and 10 with different sjb
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Saturday, November 4th, 2017 AT 4:55 AM
Tiny
PAUL BAKER2
  • MEMBER
  • 4 POSTS
Do you have a complete wiring diagram for sjb?
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Saturday, November 4th, 2017 AT 5:04 AM
Tiny
KEN L
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  • 42,959 POSTS
Yes I added it to the post above it was my mistake that I didn't add them the first time. SJB?
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Sunday, November 5th, 2017 AT 12:33 PM
Tiny
PAUL BAKER2
  • MEMBER
  • 4 POSTS
Thought it was back feeding somewhere so took sjb and plugged only power and ground in c2280a #29 & #30. Trying to find backfeed but already had false voltage showing on brake/flasher pins. I am at a lose, went and got led bulbs. It is working but concerns me why it's doing that. Atleast voltage is down to normal
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Sunday, November 5th, 2017 AT 2:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
You might have a wire rubbed through to ground. I would disconnect the connectors and run this test. Also check the power supply with everything disconnected.

https://www.2carpros.com/articles/how-to-check-wiring

Please let us know what happens.

Cheers, Ken
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Monday, November 6th, 2017 AT 10:12 AM

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