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Generation 3 Pajero NM - NP Models 2000 - 2006

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  #1  
Old 15-04-19
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Default [2002 NM 3.2] No Power to Brake Lights

Hi all,

This is a weird one, was hoping someone may be able to shed some light on it for me from their experiences.

My Brake lights stopped working - all three on the rear, someone told me at the traffic lights!

Tested the switch and it was fine.

Tested Power at the fuse and it was fine.

Wired a battery in where the switch goes and got power to the lights.

So i have a fault between the fuse and the switch - anyone know what else is in this circuit? No diagram for the brake lights in the Hayes Manual it seems.

In the meantime I have looped power off the central locking circuit into the switch and have brake lights again , so i can drive but keen to fix it properly.

Thanks in advance
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Old 15-04-19
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Could this be a related issue to the 'hazard' fuse ?
Apparently that fuse controls more than the hazard lights.

Someone smarter'n'me will have an answer
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Old 15-04-19
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Link to Gen 3 MM Service Manual and circuit diagrams.

http://www.pajero4x4.ru/piii/GR00000800-90.pdf

CD shows only 1 fuse, being Fuse 16.
With brake pedal compressed you should have 12vdc between ground and both the brown and the blue wires, measured from the rear of the plug of the brake light switch.

OJ.
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Old 16-04-19
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Quote:
Originally Posted by old Jack View Post
Link to Gen 3 MM Service Manual and circuit diagrams.

http://www.pajero4x4.ru/piii/GR00000800-90.pdf

CD shows only 1 fuse, being Fuse 16.
With brake pedal compressed you should have 12vdc between ground and both the brown and the blue wires, measured from the rear of the plug of the brake light switch.

OJ.
Thanks for the link.

Yeah no 12v at the plug at all and fuse is fine.

Must be a loose wire in the loom!
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Old 16-04-19
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Has their been a rearview camera installed recently?
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Old 16-04-19
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Quote:
Originally Posted by pajflareo View Post
Thanks for the link.

Yeah no 12v at the plug at all and fuse is fine.

Must be a loose wire in the loom!
Did you pull the fuse to check it, or probe both sides with a multimeter in situ? Could it be the fuse isn't making good contact in its socket?
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Old 16-04-19
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Quote:
Originally Posted by nj swb View Post
Did you pull the fuse to check it, or probe both sides with a multimeter in situ? Could it be the fuse isn't making good contact in its socket?
Checked insitu and replaced it anyway.

Also bridged the fuse with wire and connected it straight to the battery.

Just to be sure.
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Old 16-04-19
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I'd be checking:
Power gets to 'input' side of fuse? (sounds like it is)
Power leaves 'output' side of fuse? (D28) ? (sounds like it is)
Power gets to 'input' side of switch on brake pedal? (D125) / terminal 2 of switch
Earth intact at 13 & 17?
Continuity between lights and terminal 1 of stoplight switch?

From what you say, it seems like a break between D 28 and D125 maybe.
Just a matter of finding those connections
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Old 16-04-19
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Quote:
Originally Posted by Trojan View Post
Has their been a rearview camera installed recently?
No rearview camera.

No new mods in sometime actually
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Old 16-04-19
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Although you say the fuse is good, I would replace it and see if the lights work then. Reason - you may have a crappy electrical joint inside the fuse and there may be enough connectivity to read 12V when testing but when the circuit is loaded up (your foot o n the brake), the resistance may be too high. It is probably not this cause but it is easy enough to eliminate from the list.
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