What are the symtoms of the loom of doom...

ExMX5owner

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Just asking for a friend....:whistle:
 
Just asking for a friend....:whistle:
Tell your friend it's usually erratic performance of the remote/central locking system in that some doors/boot will lock and others don't. Unfortunately door lock actuator fault can present similar symptoms which confuses the diagnosis.;)
 
If you need to investigate @BrianH supplied this useful information a few years ago.
Boot Loom Wiring

There are 9 wires in the boot loom, below the 9 wires are grouped with the function attached. The lock/unlock and switch position functions are controlled via the central ZKE module

The two wires below are part of a common loom that triggers the door actuator/lock.
  • 1.5 BL/GR blue/grey - boot lock motor wire
  • 1.5 WS white - boot lock motor wire
The three wires below are supply wires and lock position wires, the supply is fed from fuse 7 (5amp)
  • 0.35 RT/GN red/green - boot lock switch - supply wire
  • 0.5 WS/BL white/blue - boot lock switch - unlock wire
  • 0.5 WS/GN/GE white/green/yellow - boot lock switch - lock wire
The two wires below are for the third brake light, the fuse for the third brake light is fuse F46 (15A) and controlled via the brake light switch.
  • 0.5 BR brown - 3rd brake light - earth
  • 0.75 BL/RT blue/red - 3rd brake light - supply Wire
The two wires below are for the boot interior light, this switch is located in the boot latch. The fuse for the boot light switch is F33 (10a).
  • 0.5 BR/WS brown/white - boot light switch supply wire
  • 0.5 BR brown - boot light switch - earth
HTH
 
Hmmm Thank-you gents, well it seems that is not my issue I dont think. Its odd that I went to the car this morning key on and nothing completely dead, grabbed the multimeter opened the boot checked battery volts, all good , closed boot. key on and it starts. I'm wondering too if it has anything to do with my radio needing its code every now and again..Battery terminal all clean , tight, voltage good...It,s got me this one...Next time it happens, I,ll go in via the bonnet and check voltage at the jump terminals as it seems to be connected to opening and closing the boot. Gotta love this car, always something bloody interesting going on. :whistle:
 
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Have you checked that the boot light goes off when boot is closed?
 
Have you checked that the boot light goes off when boot is closed?
Yes, I had an issue with that, the bulb is not in it, it did stay on from time to time, not every time though...
 
......... it seems to be connected to opening and closing the boot. ....
If it is, then odds on it is partly severed wires in the `loom of doom' which make and break contact as the loom flexes. I had very similar situation years ago.
 
Hmmm Thank-you gents, well it seems that is not my issue I dont think. Its odd that I went to the car this morning key on and nothing completely dead, grabbed the multimeter opened the boot checked battery volts, all good , closed boot. key on and it starts. I'm wondering too if it has anything to do with my radio needing its code every now and again..Battery terminal all clean , tight, voltage good...It,s got me this one...Next time it happens, I,ll go in via the bonnet and check voltage at the jump terminals as it seems to be connected to opening and closing the boot. Gotta love this car, always something bloody interesting going on. :whistle:
Have you checked fuses? I had a similar issue and found that 1 of 3 fuses for central locking was blown...
 
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