2005 Ford Freestyle Rear Lights Out

2005 FORD FREESTYLE
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SANDCASTLE
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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.
Jan 6, 2007 at 7:10 AM
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STRAILER
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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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Jun 27, 2017 at 9:22 AM
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PAUL BAKER2
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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.
Nov 2, 2017 at 7:39 PM
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STRAILER
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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?
Nov 3, 2017 at 4:40 AM
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PAUL BAKER2
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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
Nov 3, 2017 at 9:55 PM
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PAUL BAKER2
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Do you have a complete wiring diagram for sjb?
Nov 3, 2017 at 10:04 PM
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STRAILER
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Yes I added it to the post above it was my mistake that I didn't add them the first time. SJB?
Nov 5, 2017 at 4:33 AM
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PAUL BAKER2
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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
Nov 5, 2017 at 6:04 AM
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STRAILER
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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
Nov 6, 2017 at 2:12 AM
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Suggested Repair

Check the rear turn, brake, and hazard circuit for a wire rubbed through to ground. Disconnect the connectors and test the wiring and power supply with everything unplugged. Also verify related fuses, the relay, and the multifunction switch; swapping the smart junction box did not stop the constant voltage on the brake/turn pins.

Conversation Summary

A 2005 Ford Freestyle had no rear turn signals, brake lights, or hazards, while the high-mount brake light worked and the front signals flashed rapidly. Replacing the bulbs and swapping the smart junction box did not correct constant voltage on the brake/turn pins. LED bulbs later appeared to work, but the expert still suspected a wire shorted to ground and advised testing the wiring and power supply with the connectors disconnected.

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