Planning the next
AO Silver Member
Join Date: May 2007
Location: United Kingdom
Didn't realise the time - I thought it was later!
OK, I've had a look at the diagram now.
The door switches are connected to ground one side and the other to the main instrument panel. When the door opens, the supply to the door open indicator lights is grounded and the warning light illuminates. As these lights work, this circuit must be OK. The alarm also taps into this circuit so it can detect the doors open when the alarm is armed.
The connection to the door open lights also goes to the timer integrated into the instrument panel. The timer grounds the coil of relay I26. With the timer operating, the coil of I26 in energised allowing the interior light to be grounded and switching it on.
The first thing I'd look at is relay I26 and it's supply fuse.
The fused supply to I26 coil is from fuse F16. This fuse supplies the main light as well as the relay coil so we can assume that the fuse is OK. The fuse also supplies the boot ligh and the radio aerial.
I26 is on the auxiliary relay bracket near the fuse box. It should be between the main fusebox and the driver. It is a 20 Amp relay should be pushed into a green holder according to the manual. Have a look first to see that it is there. It may have been robbed in the past to replace a relay elsewhere.
If it's there, first thing to do is a simple test of the relay. Get in the car and shut the door. Stick your finger on the relay and wait for the timer to time out. I'm guessing that's about 40 seconds. If the timer and relay coil are working OK, you should feel the relay click open. Open the door and you should feel it click again.
If there's no click detected, you'll need to test the relay. Probably the easiest way to do that is to swap in a known good relay. There are quite a few 20 Amp relays on the main fuse box. On the right side of the main fusebox these should be a column of 4 relays. The bottom one is a 30Amp relay but the three above it are 20 Amp. They are the fog lamp, dip beam and main beam relays ( from top to bottom ). I'd suggest pulling either the main or dip relays and putting in the I26 relay. Then test the car's lights. If they light up ( main or dip - whichever relay you swapped ), the relay is ok, if not the relay is probably faulty. Replace the relays as appropriate.
Let me know how you get on testing the relay and if necessary I'll work on further tests.