Jaguar Repair: 1987 central locking failure, blown fuse, fuse panel

Question
QUESTION: Hi,

My 1987 XJ6 central locking failed today. The driver side door works mechanically both with the key and lever. From the manual it appears that the mirrors and internal lights are on the same fuse and they work. Any thoughts are appreciated.

Thanks in advance.

ANSWER: Hi Al,
Up to vin number 470739 there is a in-line fuse (15a) on the Aux fuse panel that powers the lock motors and from vin # 470740 on, the power comes from fuse # 17 (15a) in the Aux fuse panel. Power to the lock switch (in the drivers door) goes in on the brown w/blue tracer wire and on to the other door motors by orange w/red and orange w/ green tracer wires. Don't forget to test the black wire off the switch for a good ground. To lock and unlock the other doors and trunk the switch reverses the polarity on the two orange wires.
Howard

---------- FOLLOW-UP ----------

QUESTION: Hi Howard,

Thanks for the quick answer. There is a blown fuse but it only seems to be a partial fix. The trunk lock now works but not the three passenger doors. I guess the blown fuse was caused by another problem. Do you have any idea where I should look?

Thanks again,

Al

ANSWER: If the trunk lock works then the passengers lock and the two back seat locks are receiving power as they are all on the same circuit. Next step is to check for power to each motor when you operate the switch to see if the motors are disconnected. (highly unlikely) Motor failure is common on the later Ser. III cars.
Howard

---------- FOLLOW-UP ----------

QUESTION: Again, thanks for the quick response. They were all working fine earlier this week and then failed together (I assume when the fuse blew).  I hear nothing from any of the passenger doors when I turn the key but I do hear the trunk motor. Does each door have a separate motor? Does the failure of one lead to the failure of the others? I'm uncertain what my next step is.

Once again, I'm really grateful for the help. I lost my very knowledgeable mechanic (he moved to California to raise roses!).

Al

Answer
You said the trunk lock worked????? It can't be a fuse if the trunk lock works. They are all on the same circuit and yes, there is a motor in each door and the trunk lid. If any one of them works, the fuse is good as there is only one fuse. Now you must remove the door panels and test the wires at each motor when the switch is operated.
Howard