I've searched and didn't really find the info I'm looking for. I'm decent at wiring diagrams, but not great. I'm just trying to verify if the warning lights, indicators, etc are triggered by ground or by voltage. Initially, this is the list and result I came up with, but I'm not sure if some of them are correct now that I look at the wiring diagram again.

Ground triggered-
parking brake light 4J (100% sure it's ground)
seatbelt 4F (pretty sure it's ground)
fuel level gauge 2B (I'm pretty sure it's ground because it's based on resistance change)
cruise control 'set' 3L (no idea on this one)
check engine light 2A (?)

12v triggered-
high beam 4G (100% sure)
left blinker 2J (100% sure)
right blinker 2H (100% sure)
rear defrost 2I (I thought I was certain)

I'm guessing that any indicator that gets its 12v from the same source (15A meter going into the cluster at C1-01) is ground triggered, so that would be fuel gauge, brake light, seat belt, rear defrost, and maybe check engine light and cruise control? Check engine goes to the electrical load control unit, although on mine it goes to the Haltech instead, so I suppose that one depends on how I have it set up in the map. And cruise control I assume is ground because it looks like the switch opens or closes a ground circuit when pressed.

So does anyone know for sure about these?

 

I agree the schematic suggests most are ground triggered, with the exception of the turn signals and high beams as you've already found.

2I Defrost looks to be ground triggered.

For the cruise control, pin 3L looks like it gets ground triggered also. The transistor-and-diode circuit labeled 'Instrument Cluster 1H Terminal' looks related to the dashboard lighting / dimmer circuit, it might make that cruise control indicator brighter or dimmer depending on the voltage at pin 1H. Pin 1H supplies power to one of the panel illumination bulbs, which get activated by the first click of the headlight switch. The brightness of that bulb depends on pin 1G which connects to the Panel Light Control Switch (which is the dimmer wheel, not an on/off switch) on wiring diagram page I-2, but I don't think the dimmer wheel would affect the cruise indicator brightness.

 

Thank you for your input!

I never paid attention to that cruise indicator dimming with the dial, I'm not sure if they'd put effort into that one considering its size and color, so you're probably correct. I'm not good at diodes, resistors, etc on diagrams, that's the stuff that confuses me. But your assessment makes sense.

 

Well, defrost might actually be 12v lol. I checked for ground as I turned it on and it didn't change, when I checked for voltage, it read 12v.

I looked into the seatbelt light again, but I think there might be a broken wire on the seatbelt receiver. I checked for ground on the wire going to the cluster as I turned the key on. It got ground immediately, and after a few seconds, it lost it, which makes sense considering all the lights come on at first with the key on. When I connected the seatbelt, no change. I checked the side grounded to the chassis and it's good. I jumped the wires in the connector on the seat side with no change again.

Not that either of these really matter, but I'd like to keep as many lights as possible.

 

I did some more troubleshooting on the seatbelt. I verified the wiring is actually good on both sides of the connector, but the seatbelt seems to be working backwards. The wires read 25ohms without the seatbelt connected, but it reads open with it connected. The wiring diagram shows the seatbelt receiver as normally open.

 

Ok I'm an idiot lol. The seatbelt receiver is working as it should. I had a buddy verify on his too. The seatbelt receiver is normally closed, thus completing the circuit and turning on the light until you insert the seatbelt. It shows normally open on the wiring diagram, but I'm wondering if that's meant to indicate the seatbelt is connected.

 

Ah good catch. I wouldn't trust the diagram to indicate normally open or normally closed for the switches. But it tends to be correct for showing which switches or transistors are connecting to 12V or connecting to ground.

 

Yeah, the FSM typically doesn't specify NO or NC (which I would prefer!) outright, but I've found that the FSM wiring diagrams are pretty consistent in showing the switches in their "Normal", non-activated positions. Couple of examples:




^Cruise MAIN switch - this one is a mechanically latching switch with one set of terminals that are NO and the other set NC. I found this to be correct when I had to repurpose this switch to implement DBW cruise control with my Link ECU.


^Power window switches - in this example the switches are shown wired in their neutral position, and UP and DOWN positions are noted in the schematic, as is the current flow direction thru the motor.