Door switch problems
Thread Starter
2nd Gear
Joined: Feb 2022
Posts: 2
Likes: 1
From: Lititz pa
Door switch problems
Hello all my name is paul I’m new.
I’ve got a 93 40th anniversary. I replaced the drivers door adjar switch and immediately under glove box a relay started to buzz. If I turn light switch on it will stop or opening hatch stops it. I bought a new relay thinking that was it but thr new one does it too? Should I replace the switch on passenger side door to stop this?
I’ve got a 93 40th anniversary. I replaced the drivers door adjar switch and immediately under glove box a relay started to buzz. If I turn light switch on it will stop or opening hatch stops it. I bought a new relay thinking that was it but thr new one does it too? Should I replace the switch on passenger side door to stop this?
Last edited by Paulmarler; Feb 19, 2022 at 06:09 PM.
8th Gear
Joined: Aug 2020
Posts: 8
Likes: 1
From: Dyer, IN
When I bought my '96 it had a broken door ajar switch. The center plunger was missing. So when I opened the door, the courtesy lights would not come on and the radio would not shut off like it is suppose to. So I bought a new one and it still didn't work. So, I figured it was something else in the circuit and started to trace everything, The switch is normally closed when the door is open completing the ground circuit for both the hatch button and courtesy lights. When the door closes it opens the circuit. I looked for shorts in the wire before they lead into the switch to see if it was getting grounded there. I couldn't find anything. I was beating my head against the wall trying to figure out the issue. Everything looked right. Then I decide to jumper the connector for the door ajar switch and the courtesy lights cam on and it worked. So, long story short.....the new switch was bad. I exchanged it and put it in and everything worked.
But with that being said, i cant see a bad switch causing a relay to buzz. Sounds like it is a different issue. But testing the switch would be an easy place to start. Was the old door ajar switch disconnected by the previous owner? If so, maybe it was due to the buzzing problem.
Matt
But with that being said, i cant see a bad switch causing a relay to buzz. Sounds like it is a different issue. But testing the switch would be an easy place to start. Was the old door ajar switch disconnected by the previous owner? If so, maybe it was due to the buzzing problem.
Matt
Thread Starter
2nd Gear
Joined: Feb 2022
Posts: 2
Likes: 1
From: Lititz pa
Thank you I hate barking dogs
you Are 100 correct the 5amp fuse was blown on the panel #36. Once replaced I plugged the new relay in and the interior lights came on and no buzzing sound!!!
I Appreciate you help and to the other members it’s great to be here !!!!
you Are 100 correct the 5amp fuse was blown on the panel #36. Once replaced I plugged the new relay in and the interior lights came on and no buzzing sound!!!
I Appreciate you help and to the other members it’s great to be here !!!!
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
It's not the door switch. The door switch is an input to the Central Command Module ("Body Controller"). The CCM controls the CTSY light relay dependent on several inputs including the door switches.
Do the courtesy lights come on when you turn the dash switch? Do they come on when you open the hatch? If = NO begin by checking all fuses, including the under dash aux fuses.
The buzzing is caused by insufficient voltage at the relay. I don't have a FSM for 1993, so I can't tell you exactly which fuses are involved. But I would begin by checking all the fuses in the Inst Panel fuse box, and the under dash aux fuses. There is at least one aux box, there may be two in a 93, but I'm not certain. The aux box(es) are under the RH dash, about where the ctsy light relay is, but way up against the firewall. I know there is at least one CTSY fuse, there may be two CTSY fuses in a 93. "LCD" in the IP box is for the ctsy light relay coil.
I check fuses with my meter on DC Volts. Put one lead on ground (lighter shell is a good ground). There are 2 little holes in each fuse. Touch the meter to one, then the other hole. If that circuit is live, there should be voltage on both holes. If there is voltage on only one hole, that fuse is bad. If you place the key in RUN, almost all of the circuits will be live for testing. The few that aren't will make sense. Rear defog, htd mirror, crank. The fuses involved with the CTSY lights will all be hot at all times.
Do the courtesy lights come on when you turn the dash switch? Do they come on when you open the hatch? If = NO begin by checking all fuses, including the under dash aux fuses.
The buzzing is caused by insufficient voltage at the relay. I don't have a FSM for 1993, so I can't tell you exactly which fuses are involved. But I would begin by checking all the fuses in the Inst Panel fuse box, and the under dash aux fuses. There is at least one aux box, there may be two in a 93, but I'm not certain. The aux box(es) are under the RH dash, about where the ctsy light relay is, but way up against the firewall. I know there is at least one CTSY fuse, there may be two CTSY fuses in a 93. "LCD" in the IP box is for the ctsy light relay coil.
I check fuses with my meter on DC Volts. Put one lead on ground (lighter shell is a good ground). There are 2 little holes in each fuse. Touch the meter to one, then the other hole. If that circuit is live, there should be voltage on both holes. If there is voltage on only one hole, that fuse is bad. If you place the key in RUN, almost all of the circuits will be live for testing. The few that aren't will make sense. Rear defog, htd mirror, crank. The fuses involved with the CTSY lights will all be hot at all times.
