Frame of reference: 1993 FZJ-80, basic trim package. Manual cloth seats, no moon roof, no roof rails, no lockers. Just the basics, please. Purchased the truck this summer, have been fixing little things here and there, getting my parts list together for the big fun stuff. No major issues with it, just this one little thing that is driving me a little nuts. The dome lights and the vanity lights do not function.
What have i done so far? I have found an EDM for reference, and spent several nights figuring out how to use it. Basic troubleshooting that i have done would be to clean up all the door switches with contact cleaner. I get all five doors to illuminate the door open light on the dash now. The two rear passenger ones were a little cruddy when i started. The cargo hatch was operational.
The dome fuse is good. Checked it several times. Replaced several times. The clock functions as it should. The radio memory functions as it should. The courtesy light around the ignition switch functions as it should.
I have replaced the dome light bulbs twice. Tested the originals from the truck and the subsequent replacements, and all appear to be good.
I have tested for power at the dome light sockets. I get .7v at them with the doors open. With the doors closed, i get ~12.6v. I have checked continuity for the pin switches to ground, and they are good. Continuity between the wire at the back of the switch to the bulb socket looks good too.
I have located the IE1 plug in the driver's side footwell, and with the door open i get .7v at the body side of the plug on the power wire (Pin 2, IE1), and i get the same voltage on the body side of the plug. I traced the wire from pin 2 on the IE1 plug back to the splice at E12, then back to the plug at EA1 and i have good continuity all the way back to the dome fuse. No issues were found with the wire. If i push the driver's side door switch in, i get ~12.6v on both sides of pin 2.
I have located the ID2 plug on the driver's side. If i disconnect ID2, i get 12.6v at pin 2 of IE1.
If i use my power probe to energize pin 2 on IE1, i get normal function of dome light, as well as the vanity lights in the sun shades.
I have no courtesy lights on the doors, nor do i have a rear cargo compartment light by the rear hatch.
What else do i know? I know i haven't located the diodes yet.
What do i suspect? At this point, i am beginning to suspect the D8 diode. Why? Because of the .7v.
I'm only an ok electrical diagnostician, and i think that i have exhausted what i know, and what i think i know at this point. The loss of voltage to the socket is what is puzzling me. I can't make sense of why completing the circuit would drop the voltage like that. It's probably something silly that will make me smack myself. There is something going on that i don't understand which is baffling me.
Thanks for any assistance. I can typically figure out what i need to know on mud by using the search function, which is why i don't have a very high post count. I had to phone a friend this time.
What have i done so far? I have found an EDM for reference, and spent several nights figuring out how to use it. Basic troubleshooting that i have done would be to clean up all the door switches with contact cleaner. I get all five doors to illuminate the door open light on the dash now. The two rear passenger ones were a little cruddy when i started. The cargo hatch was operational.
The dome fuse is good. Checked it several times. Replaced several times. The clock functions as it should. The radio memory functions as it should. The courtesy light around the ignition switch functions as it should.
I have replaced the dome light bulbs twice. Tested the originals from the truck and the subsequent replacements, and all appear to be good.
I have tested for power at the dome light sockets. I get .7v at them with the doors open. With the doors closed, i get ~12.6v. I have checked continuity for the pin switches to ground, and they are good. Continuity between the wire at the back of the switch to the bulb socket looks good too.
I have located the IE1 plug in the driver's side footwell, and with the door open i get .7v at the body side of the plug on the power wire (Pin 2, IE1), and i get the same voltage on the body side of the plug. I traced the wire from pin 2 on the IE1 plug back to the splice at E12, then back to the plug at EA1 and i have good continuity all the way back to the dome fuse. No issues were found with the wire. If i push the driver's side door switch in, i get ~12.6v on both sides of pin 2.
I have located the ID2 plug on the driver's side. If i disconnect ID2, i get 12.6v at pin 2 of IE1.
If i use my power probe to energize pin 2 on IE1, i get normal function of dome light, as well as the vanity lights in the sun shades.
I have no courtesy lights on the doors, nor do i have a rear cargo compartment light by the rear hatch.
What else do i know? I know i haven't located the diodes yet.
What do i suspect? At this point, i am beginning to suspect the D8 diode. Why? Because of the .7v.
I'm only an ok electrical diagnostician, and i think that i have exhausted what i know, and what i think i know at this point. The loss of voltage to the socket is what is puzzling me. I can't make sense of why completing the circuit would drop the voltage like that. It's probably something silly that will make me smack myself. There is something going on that i don't understand which is baffling me.
Thanks for any assistance. I can typically figure out what i need to know on mud by using the search function, which is why i don't have a very high post count. I had to phone a friend this time.
