I know similar questions have been asked before but I don't seem to have any of the issues previously discussed.
I have a 2005 TD5 SW with OEM central locking and alarm. The 20a fuse blows every time I try to use the central locking. It typically locks then blows immediately on unlocking. I have stripped the doors, degreased and lubricated the locks (which were a bit sticky) and checked the wiring from actuator to door pillar connector. The wiring is all in good condition.
When I put a multi-meter across the orange then pink wires and earth (with the fuse out) I get no resistance. disconnecting each door loom there is resistance on the door loom but none from the door connector. To me this implies a break in the insulation somewhere.
When I find the same wires under the driver's seat there is resistance between the door side of the connector but, no resistance on the side which I believe travels up to the alarm ECU.
I read in the workshop manual 'Each CDL latch motor is connected by two wires to the anti-theft ECU which
alternately supplies power and earth connections to drive each motor to the lock or unlock positions.' I'm guessing power and earth is provided temporarily when the ECU is activated by the fob/key and this is swapped depending if the instruction is lock or unlock.
My question is, should there be resistance between each of these wires coming from the alarm ECU and earth when the system is not powered or activated? Should I be trying to find a break in the insulation or is the alarm ECU fritzed?
Any help would be appreciated...
I have a 2005 TD5 SW with OEM central locking and alarm. The 20a fuse blows every time I try to use the central locking. It typically locks then blows immediately on unlocking. I have stripped the doors, degreased and lubricated the locks (which were a bit sticky) and checked the wiring from actuator to door pillar connector. The wiring is all in good condition.
When I put a multi-meter across the orange then pink wires and earth (with the fuse out) I get no resistance. disconnecting each door loom there is resistance on the door loom but none from the door connector. To me this implies a break in the insulation somewhere.
When I find the same wires under the driver's seat there is resistance between the door side of the connector but, no resistance on the side which I believe travels up to the alarm ECU.
I read in the workshop manual 'Each CDL latch motor is connected by two wires to the anti-theft ECU which
alternately supplies power and earth connections to drive each motor to the lock or unlock positions.' I'm guessing power and earth is provided temporarily when the ECU is activated by the fob/key and this is swapped depending if the instruction is lock or unlock.
My question is, should there be resistance between each of these wires coming from the alarm ECU and earth when the system is not powered or activated? Should I be trying to find a break in the insulation or is the alarm ECU fritzed?
Any help would be appreciated...