Headlights and Interior Illumination Question

[mikeb75]

Got a question for the electrical gurus here: I have completed the wiring of my headlights and have them working correctly; even the high beam indicator on the combination meter works. However, the combination meter and hazard switches do not illuminate when the lights are on.

Am using a dieted 2003 turbo harness, and we removed both the DRL system and the Integrated Module box. When we removed the DRL systems, we trimmed out the Diode, DRL control module, DRL resistor and RDL relay. A splice was made between pin 17 on connector B71 (dimmer, passing switch & lighting switch) and connector B61 that leads to the headlights.
headlight mod wiring.png

I believe that, since the Integrated Module was removed there is no longer a connection to the illumination of the combination meter or hazard switch. I have tested jumpering connector A9 on the CM to 12V, and this correctly activates the lighting. But, I want to restore functionality of dash/hazard illumination to the headlight status so it works properly, and this is where I’m having trouble.

If I’m reading the system properly, the headlight/dimmer switch works off ground? That doesn’t help me get switched 12V to the CM. Using a volt meter I haven’t found a hot 12V on the lighting switch. Anyone know if there is one (pins 10,11,12 that used to connect to the IM)?
Integrated mod wiring.png

Any other suggestions, anything obvious I’m missing here?

[svanlare]

I have the '07 schematic not the '03 so guessing a little. The dash lights are controlled via the Integrated Module and the power comes from the Yellow wire (B15 also marked A as it leaves the page) and the return is the Orange/White wire (A14 and also marked B). Those two wires go to the Clock, Hazard and Dash to control the illumination. Without the module, the dimmer won't do anything.

I can't read the pin numbers on your schematic, but you might be able to get away with putting +12 to the GrR (pin 12) and using pin 11 to power the hazard and Dash lights. I have no idea what the Integrated Modules did with the signals or how much current the dimmer switch can take.

While I don't think the Lighting switch normally has power, the Parking switch does, with pin 1 always having +12 and pin 2 only having power with the lights are on.

[mikeb75]

Thanks Steve! Pin 2 in the parking switch is a winner (and finding a clean ground for testing).

[lclevert]

I'm at this point now. To get the CM illumination to work, do you wire pin 2 (Black/Red) wire from the parking switch to pin 12 (Grey/Red) on the lighting switch to get power, and then wire pin 11 (Blue) wire on the lighting switch to pin A9 on the CM? What color wire on the cluster harness goes to pin A9? I want to make sure I'm reading the pin out diagram correctly.

03 WRX

Thanks

Skip

[mikeb75]

Skip, in my case it was actually a missing ground. After removing the integrated module I grounded the illumination connection from the instrument cluster (pin B16 on my 03 WRX harness). After correcting that the illumination of the instrument functioned correctly, coming on with the head lights.

hope this helps
-mike

[lclevert]

Mike, just to clarify... After removing the DRL and the integrated module, did you have to do anything else to get the illumination on the instrument cluster to work other than grounding it (pin B16)? You still had to get power from pin 2 on the parking switch - correct?

Thanks

Skip

[mikeb75]

The only change I made after removing the DRL & IM was to re-connect the ground. No other modifications, no jumping power on pin 2 (that was a total wild goose chase on my part because I hadn't seen the missing ground).

[lclevert]

Thanks Mike. Good to know.

skip

[Harley818]

This is one of my open issues.....no lights on the IC, so I'll try grounding the IC per Mikeb75 above.
I kept the DRL, which works great, but I deleted the IM, but I'm thinking its the same issue.