Door fails to lock...147

[baldrick]

My new to me (and lots of fun) '02 147 5 door has a few quirks that need ironing out. One is that the the curb-side rear door doesn't lock when all the others do. The solenoid would be my guess, but of course I could be wrong. As I would like to keep this fun little jigger I would like to sort this pronto! Ideas?

[bonno]

Hi
You will need to remove the door card and check for loose connection and or getting power to the solenoid (test lamp or multimeter).

[baldrick]

Good thinking, that I will do.

[Citroënbender]

When you open the naughty door, does the rear cabin light come on?

[baldrick]

The interior light does not come on when the naughty door is opened, either when the car is locked or unlocked. The well behaved doors all trigger the interior light when unlocked and opened.

[bazzbazz]

Check the wiring harness between body & door for broken wires/connections.

[Citroënbender]

You'd have to agree two broken wires on one part of the door harness is not common in Australia, considering we don't have the cold to harden their insulation.

[bazzbazz]

I've seen worse, but the plugs in the door jam can become loose/dirty. That's why I said check connections. 

[baldrick]

I'll let you guys know what I find as soon as I pull off the door card. I'll assume from Citroenbenders little test that the door light switch is mounted in the door rather than then door frame and i'm looking at an "electrons in electrons out" situation rather than a locking solenoid issue. That said the power window does work (from the drivers switch panel at least) so some electrons are getting in and out.

[Citroënbender]

Yes, there's a "normally open" switch that closes when the latch is fully unlocked, this triggers the cabin lights and also informs the body computer of the door's status (ie, open). The switch is part of the door lock and the telltale wire (signal return) is "made" to a ground wire that is grounded within the cabin - not on the door.

The lock motor is driven from the same two junction blocks as the other doors, on the same fuses.

[baldrick]

Thats good to know Citroenbender. That means I can test that switch by simply switching the ignition on and opening the door. If that circuit is no good then the warning on the central computer panel will not show "door open" icon.

[Citroënbender]

Correct. Try driving off without the driver's door shut properly and the dash will carry on like a pork chop. If it doesn't react similarly with the recalcitrant door then yes, likely a problem between the pillar harness plug and the lock unit.

Re the multiway conector from door jamb to door:

The pins have tiny, barely visible, numbers on the mating faces.  On the pillar itself, you're looking to test for 12V briefly appearing between pins 1&2 when the other doors lock or unlock.  An analogue meter or 5W globe is fine to use; operate the locking with your remote. Similarly, if you ground out pin 3 on the connector, the rear interior lamp should light.

[baldrick]

Thanks Citroenbender. Out of town for a couple of days will report back my findings as soon as I can test it. Cheers

[Citroënbender]

Did you get anywhere with this mystery?

[baldrick]

Just arrived back in the country - but to Melbourne not Adelaide will get to play on the weekend I hope...