L494 help needed
- Thread starter R300
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Maybe check with a voltmeter that there's power to it then?
Can the locks/doors etc. not be individually triggered from diagnostic kit?
Can the locks/doors etc. not be individually triggered from diagnostic kit?
Datatek
Well-Known Member
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Maybe the module needs coding to the car? Otherwise on a normal car I would look for a broken wire between the door and the B post.
Thanks
the outside handle works on touch but doesn’t actually lock the door. When you put your hand to the handle it unlocks and locks the other doors but not right rear
- Posts
- 16,487
- Location
- Benfleet, Essex
That suggests there is power to the "sensing" side of things. Maybe the wire to the lock-motor is faulty. Both motors on both units being kaput is less likely unless they are a common failure point.Thanks
the outside handle works on touch but doesn’t actually lock the door. When you put your hand to the handle it unlocks and locks the other doors but not right rear
The module doesn't need coding but is a slave module to the front door module on the same side.
Does the window work from the drivers door switch or 'global close'?
If the window and lock are non-functional, then either a power or ground issue is likely to be the cause.
Fuse 44 in the central junction box (behind the glovebox) is a 25A fuse and supplies the power through several connectors.
Does the window work from the drivers door switch or 'global close'?
If the window and lock are non-functional, then either a power or ground issue is likely to be the cause.
Fuse 44 in the central junction box (behind the glovebox) is a 25A fuse and supplies the power through several connectors.
All door/windows and sun roof all work and on global open/close bar right rear. I thought it may be controlled by front right module so have ordered a used one to try.
If the right rear isn't operable on global close, then check power & ground first.
On the right rear door module, pin 2 is power (should be nominally 12V with ignition off) pin 13 is ground and pin 20 is LIN - with it unplugged from the module, expect around 9-11V
On the right rear door module, pin 2 is power (should be nominally 12V with ignition off) pin 13 is ground and pin 20 is LIN - with it unplugged from the module, expect around 9-11V
Is the power sent from the front drivers door module to the back rear right module?
just checked and fuse 44 is 10am fuse for steering column
Well something is off, as previously advised, check the clear / white fuses in the fusebox behind the glovebox, if OK then check you have battery voltage across pins 2 & 13 at the right rear door module.
Edit:-
Are you sure you're looking at the fuse labels correctly? there isn't a 10A fuse for the steering column (it's not fused directly) but there is for the heated steering wheel in position 20
Edit:-
Are you sure you're looking at the fuse labels correctly? there isn't a 10A fuse for the steering column (it's not fused directly) but there is for the heated steering wheel in position 20
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Sorry was looking in the service book and it’s wrong! Just checked fuse 44 25amp and it ok not blown.
Check the door connector (drivers door open, you can see the connector and harness on the B pillar, the door connector has a 'Slidelok' latch, it'd be worth opening it up to check for water ingress. If all OK and you have battery voltage across pins 41 & 12, then check at the module on pins 2 & 13 - it's always possible you have a defective second module, I've changed them often in the past and had a defective / unresponsive one on my L405 (same module) on the same door - although they're the same module left to right, so you could always try it on the left rear door to rule out a defective module...
Ok thanks
Sorry, that should be pins 15 & 12 on the door connector.
Pin 41 is the LIN connection.
BTW, the passive ('keyless') entry connections from the door handle go directly to the KVM and don't rely on power or communications from any door module.
I'd strongly suggest you disable passive entry as it's a massive weak point in security.
Pin 41 is the LIN connection.
BTW, the passive ('keyless') entry connections from the door handle go directly to the KVM and don't rely on power or communications from any door module.
I'd strongly suggest you disable passive entry as it's a massive weak point in security.
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