2003-2008 Toyota Matrix Corolla Pontiac Vibe fog lights DRL + keep auto headlights mod

This page describes a method of modifying running light relay module to use OEM fog lights or custom aftermarket LED lights as daytime running lights while keeping automatic low beam headlights functionality for select Toyota Corolla, Toyota Matrix, and Pontiac Vibe cars.

Driving with low beam headlights on during the day (Daytime Running Lights, or DRL) makes the car look very dated, as newer cars use separate running lights (ex: LED light strip) instead of using the headlights.

There are guides online for disabling DRL low beam headlights, but previous methods often disabled automatic headlights at night, which is a useful feature at night that many drivers want to keep.

Advantages of modifying running light relay module method

• Use OEM fog lights or custom aftermarket LED lights as DRL (running lights during day) instead of low beam headlights
• Compatible with HID and LED low beam bulbs
• When used with OEM fog lights, the OEM fog light switch acts as DRL on/off switch.
• Auto-off low beam headlights at night
• Auto-off fog lights when engine is turned off, even if switch is on
• Does NOT require disassembly & removal of instrument cluster (speedometer/odometer)
• Does NOT require splicing, modifying, or cutting car's dashboard or headlight wiring

YouTube Pontiac Vibe DRL Mod from GenVibe.com member Sean Thurwachter

Applies to

Cars using Toyota part number 82810-02050 running light relay module, including:

• 2003-2008 Toyota Corolla (9th gen, E120)
  
• 2003-2008 Toyota Matrix (1st gen, E130)
  
  
• 2003-2008 Pontiac Vibe (1st gen, E130)
  

Background

Daytime Running Lights, or DRL turns on car lights during the day for better visibility. For 2003-2008 Toyota Corolla, Toyota Matrix, and Pontiac Vibe models, car is programmed to turn on low beam headlights in at low power mode (60% power) using PWM signal.

Disadvantages of stock configuration

1. Uncool look. Driving with low beam headlights on during the day (Daytime Running Lights, or DRL) makes the car look very dated, as newer cars use separate running lights (ex: LED light strip) instead of using the headlights.
2. DRL signal is not compatible with HID and LED low beam bulbs. Low power PWM signal is not compatible with HID or LED bulbs. PWM, or Pulse Width Modulation, is basically a really fast ground switching system.

Advantages of stock configuration

1. Automatic lights turns on low beam headlights (at full power) and taillights at night (or when there's insufficient light in tunnels, parking garages, etc) using an ambient light sensor.
2. Auto-off fog lights when engine is turned off, even if switch is on

Modification details

The instructions on this page explain how to modify the running light relay module to use OEM fog lights or custom aftermarket LED lights as daytime running lights while keeping automatic low beam headlights functionality. This also supports automatic low beam headlights with HID and LED bulbs, as lights are turned on at full power.

After modifications, during the day with headlight switch off, the fog light switch acts as DRL on/off switch.

When engine is ON, car lights will function based on the table below. (YouTube Pontiac Vibe DRL Mod from GenVibe.com member Sean Thurwachter)

Headlight switch	Fog light switch	Day result	Night result
OFF	OFF	Headlights low beam OFF Fog lights OFF	Headlights low beam ON Fog lights OFF
OFF	ON	Headlights low beam OFF Fog lights ON	Headlights low beam ON Fog lights ON
Low beam ON	OFF	Headlights low beam ON Fog lights OFF	Headlights low beam ON Fog lights OFF
Low beam ON	ON	Headlights low beam ON Fog lights ON	Headlights low beam ON Fog lights ON
High beam ON	OFF	Headlights high beam OFF Fog lights OFF	Headlights high beam ON Fog lights OFF
High beam ON	ON	Headlights high beam ON Fog lights ON	Headlights high beam ON Fog lights ON

Note: During the day, headlights high beam switch will not turn headlight high beam lights on (as noted in red above). High beam lights will only turn on at night or if low beam headlights was on.

Alternative modifications

If you're looking to 

1. Disable DRL and disable automatic low beam headlights
2. Keep DRL and keep automatic low beam headlights, but display DRL low beam headlights at full power during the day
3. Keep DRL low beams headlights, disable automatic low beam headlights
4. Use high beam headlights at low power as DRL

then don't follow the instructions below. Instead check out the instructions at ToyotaNation.com Ultimate DRL and Autolight Thread

Parts needed

• Soldering iron with fine tip
• Small screwdriver
• Small wire cutter 
• Small wire stripper for #22AWG wire
• #22AWG or similar electrical wire
• header pin connector

Instructions

Disconnect battery from car

Remove running light relay module from under steering column

No need to disassemble the dashboard, just crawl under steering column...

and look for the running light relay module...

Push the DRL relay module in the direction of red arrows to remove module from the metal mounting bracket, then slowly wiggle the plastic connector side to side to disconnect the connector. The plastic connector is difficult to disconnect, so be patient and wiggle the connector back and forth until it slowly backs out and the module is free.

Disassemble plastic case of module to access the circuit board

Use a small screwdriver or case opening tool to pry plastic cover off around the white connector. 

Now, carefully slide out the circuit board from the module. The circuit board will look like this:

Create electrical wires needed 

Choose one of the options below

1. If using OEM fog lights as DRL, you'll need to create 2 wires, first wire about 6in long, second wire about 8 inches long.
2. If using custom aftermarket lights as DRL, you'll need to create 2 wires: 1 wire about 6in long, other wire needs to be long enough to reach aftermarket light relay.
3. If you want option to either use OEM fog lights or custom aftermarket lights as DRL, then you'll need to create 3 wires: 1 wire about 6in long, other 2 wires needs to be long enough to reach aftermarket light relay

Stripping wires

1. Use wire stripper to strip 1/8" from both ends of each wire
2. Crimp a 2.54mm pitch header pin female connector to 1 end of each wire. Leave the other end bare.
3. IMPORTANT Slide an insulating plastic cover over the connector to prevent electrical shorting
4. If you want option to either use OEM fog lights or custom aftermarket lights as DRL, then crimp a male connector to one of the long wires.

Cut out section of pin #6 between circuit board and connector

Cut out a ~1/4" section of pin #6 between circuit board and connector.

Use the custom wires to connect DRL signal to fog lights or custom aftermarket light relay

If using OEM fog light as DRL, make the following connections

1. DRL lights source (#6 board side) -> fog lights (#4 pin on underside)
2. Automatic lights source (#14 on underside, pink wire) -> headlight low beam (#6 connector side, pink wire)

If using aftermarket lights as DRL, make the following connections

1. DRL lights source (#6 board side, brown wire) -> aftermarket lights relay
2. Automatic lights source (#14 on underside, pink wire) -> headlight low beam (#6 connector side, pink wire)

If using OEM fog light or aftermarket lights as DRL (pictured), make the following connections

1. DRL lights source (#6 board side, brown wire) -> fog lights (#4, green wire)
2. Automatic lights source (#14 on underside, pink wire) -> headlight low beam (#6 connector side, pink wire)

For connections to pin #6, gently bend the pins away each other, then plug the connector end of wire into the pins. Use electrical tape to secure the plastic insulation sleeves to prevent electrical short.

For connections to underside of circuit board (pin #4 and #14), solder the wire to the pins on the underside of the circuit board. 

Use a fine tipped soldering iron, and verify solder doesn't touch adjacent pins. If solder touches adjacent pins, use an x-acto style hobby knife and cut/scrape off any solder.

Reassemble DRL module plastic case, re-connect module to car, re-connect battery to car

"Reassembly is a reversal of disassembling."

The DRL relay module with completed modification with option to either use OEM fog lights or custom aftermarket lights as DRL.

Modification technical details

The running light relay module (Toyota part number 82810-02050) in 2003-2008 Toyota Corolla, Toyota Matrix, and Pontiac Vibe cars controls both DRL and automatic low beam headlights  behavior based on the ambient light sensor.

Inside the module, output pins are connected to low beam headlight, fog light, and tail lights.

Just cutting wire #6 to headlight low beams doesn't work, as the low beam headlights would stop working.

• To keep automatic headlights at night working, we need the low beam headlights (#6 pin on connector) to turn on when tail lights are turned on (pin #14). (tail lights are different from brake lights)
• To use OEM fog lights (or custom aftermarket LED lights), we need the DRL signal (#6 board side) to be connected to OEM fog lights (pin #4) or to relay of custom aftermarket LED lights

Credits

Instructions were compiled from the wisdom of the Internet, including sources below

• ToyotaNation.com Ultimate DRL and Autolight Thread
• GenVibe.com Disable DRL, but KEEP Automatic Lights - 03-08 ONLY Thread
• YouTube Pontiac Vibe DRL Mod from GenVibe.com member Sean Thurwachter
• electrolund.com Disable DRL and disable auto headlights Mod 

DIY 2006-09 Honda S2000 Hardtop Defroster Sub-Harness (Honda part number 32204-S2A-305)

DIY 2006-09 Honda S2000 Hardtop Defroster Sub-Harness (Honda part number 32204-S2A-305)

Honda OEM part for 2006-2009 model year S2000 is discontinued or expensive to find online, but you can make your own 2006-2009 S2000 Hardtop Defroster Sub-Harness by modifying harness an existing AP1 or 2002-05 AP2 sub-harness.

Using a OEM style connector avoids modifying your car's wiring and avoids risk of electrical short from exposed metal wires.

Applies to

OEM hardtop install on 2006-2009 Honda S2000 AP2

Background

• All AP2 S2000 cars with a glass window & defroster in convertible top already include hardtop wiring and a connector for connecting to a hardtop defroster. 
• OEM hardtop defroster wire does NOT connect directly to car, but requires S2000 Hardtop Defroster Sub-Harness
  
• S2000 Hardtop Defroster Sub-Harness connects car defroster's connector and OEM hardtop catcher sensor's 2 pin connector to OEM hardtop defroster, enabling car to switch defroster between convertible glass window or hardtop depending on if hardtop is installed.
• Not all AP2 S2000 cars came with the same hardtop defroster connector. Different model year S2000 include a different hardtop defroster connector, thus requiring a different S2000 Hardtop Defroster Sub-Harness
• 2002-05 AP2 S2000 uses 32204-S2A-306 Hardtop Defroster Sub-Harness
• 2006-09 AP2 S2000 uses 32204-S2A-305 Hardtop Defroster Sub-Harness

Connector variations

2006-09 AP2 S2000 car's hardtop defroster connector is different from 2002-2005 AP2, so 06-09 AP2 requires a different S2000 Hardtop Defroster Sub-Harness from 02-05 AP2.

Hardtop Defroster Sub-Harness for 2006-09 AP2 S2000 uses the same connector as 1993-2001 Honda Prelude, 1992-97 Honda Accord Vehicle Speed Sensor connector, which can be easily found online or your favorite auto parts stores (ex: Dorman Vehicle Speed Sensor Connector 645-916).

Parts Needed

1. Hardtop Defroster Sub-Harness for 2002-05 AP2 S2000 (Honda part number 32204-S2A-306)
2. Honda Vehicle Speed Sensor connector for 1993-2001 Honda Prelude, 1992-97 Honda Accord (ex: Dorman Vehicle Speed Sensor Connector 645-916)
   

Instructions

1. Push 3 harness metal pins out from plastic connector housing on Hardtop Defroster Sub-Harness (4 pins for 32204-S2A-306). Harness should have 3 wires - black, black with red stripe, and green.
2. Remove white cap on connector, and push pigtail wires metal pins out from the front of plastic connector housing on Honda Vehicle Speed Sensor connector. Note the location of plastic tabs holding the pins, and use a screwdriver to lift the pins away from the tabs and push the pins out from the front of connector.
   
3. Insert the 3 metal pins from the sub-harness into the plastic connector housing from Honda Vehicle Speed Sensor. Verify the order of wire colors with the car's connector. Then replace the white cap to reassemble the connector housing
   

Credits

• Official Honda 2008 S2000 Hardtop installation instructions (PDF link)
• s2ki.com - Question about OEM hardtop defrost harness
• s2ki.com - Fitted a Hardtop fixing kit today
• https://sites.google.com/site/lazykiwi/diy

Upgrading to Scion Pioneer Premium radio in a 2007 Toyota Yaris

I’m sharing how I upgraded the radio on my 2007 Toyota Yaris car to add Bluetooth, HD Radio, and USB input with iPod/iPhone connectivity with a radio from a newer Scion car.  The new radio fits perfectly, re-uses your car’s existing AUX 3.5mm mini plug port and USB ports (if available), and blends in like it came from with the car from the factory, so it won't attract attention from car thieves.

Installation takes about 2-3 hours, is plug-and-play with no soldering and only requires basic hand tools.

Before

After

Parts list

• Pioneer Premium radio, part number: PT546-00121
• You can also use other Scion radios, discussed in Alternative Scion radios section below.
• Scion Antenna adapter cable, part number: PT546-00120-AD
• Scion 20+8 Pin to 28 Pin adapter cable, part number: PT546-00120-CH
• Scion Bluetooth microphone, part number: PT546-74120-MC
• Needed to stream Bluetooth audio. Radio won't connect without microphone. Custom powered microphone, can't use a generic part
• USB adapter cable for Toyota, generic eBay part or part number PT546-00120-US
• Recommend getting a Toyota USB adapter cable with USB type A receptacle jack (link) if your car doesn’t already have OEM USB ports. The OEM USB adapter cable has a proprietary connector.
• (Optional) USB audio & charger port for Toyota, generic eBay part
• For adding additional USB ports near parking brake handle for easy access (link)

I purchased the radio + adapter cables from partsbrokersllc seller on eBay (link) (I’m not affiliated in any way with this eBay seller, just sharing here as this seller offers a good deal)

Pioneer Premium radio

The Pioneer Premium radio (Toyota part number PT546-00121) I used is from 2012-2013 Scion cars. The front of the radio is labeled ADCP-W12U T1818.

Radio features

6.1" touch screen LCD with multi-function volume & tune knob and touch keys

Music CD playback - Music CD/CD-R/CD-RW playback is possible.

MP3 file playback - You can play back MP3 files recorded on CD-ROM/CD-R/CD-RW (ISO9660 Level 1/Level 2 standard recordings) or USB portable audio player/USB memory. 

iPod compatibility - When you use this unit, you can control an iPod, iPod classic, iPod nano, iPod touch, iPhone 3G/3GS/4. Probably doesn’t work with newer iPhones, but I wasn’t able to test this.

HD Radio

Bluetooth 2.1+EDR for hands-free phone calls and A2DP music streaming

3.5mm mini plug AUX input

XM Satellite Radio ready (additional satellite receiver and antenna required)

More information: Official Scion instruction manual (PDF)

Alternative Scion radios

Alternatively, the "base" Pioneer radio from 2012-2013 Scions (Toyota part number PT546-00120) can also be installed in the same way. Older

Adapter cables

The new radio uses different plugs compared to the stock radio. Fortunately, Scion makes official adapter cables that can be used with the Toyota Yaris, and some vendors include them when buying the radio.

Please double-check the photos and description of the radio to see if the adapter cables are included.

Instructions

The instructions below are from my 2007 USA market Toyota Yaris, but same instructions should apply to 2005-2011 Toyota Yaris/Vitz/Belta.
You can watch the YouTube video below to get an idea of the steps. I didn’t make this video, so my steps are a little different.

1. Note your old radio AM/FM pre-sets and eject CD from old radio. Then, open hood and disconnect car battery's negative terminal.
2. Remove instrument panel lower center finish panel by pulling outward
3. Remove instrument panel left finish panel by pulling outward
4. Remove instrument panel right finish panel by pulling outward
5. Remove instrument cluster surround finish panel by pulling outward.
6. Remove vent & radio frame. (Don't forget to disconnect the hazard warning signal switch connector that plugs into top of the frame)

Now you should see something like this.

7. Remove the 4 circled bolts, pull out the old radio, and disconnect the plugs on the back of the radio. I used a screwdriver to gently pry the plugs away from the radio.

8. From the radio opening, thread the USB port end of the adapter cable through the gaps in wiring to passenger footwell or glovebox. Plug the USB adapter cable to the new radio.
Check the end of this post if you're interested in the optional step of installing a USB port near parking brake with extension cable that connects to the USB adapter cable.


Photo above shows where USB port of the USB adapter cable is routed behind dash and comes out from behind dash and into passenger footwell. You can also route the USB port into the glovebox.
9. Lift up the corner of the plastic dash trim and carefully pull cable of Bluetooth microphone through gap above steering wheel, and secure the microphone to dash with the included double-sided tape.

10. Remove the left & right metal brackets and screws from the old radio, and install them on the new radio.

11. Connect adapter cables to vehicle and plug in the cables to the radio. Don't forget to connect the Bluetooth microphone cable too!

12. Gently push the new radio back into the radio opening, and hand-tighten the radio bracket bolts.
13. Now it's time to test if everything works before re-installing all the plastic trim pieces. Re-connect negative terminal of car battery, insert key into ignition and turn key to ACC (accessory). Check that the radio turns on, and verify FM radio, Bluetooth, USB input, and 3.5mm AUX mini plug are working.
If everything works, then continue on and put the car back together.
14. Disconnect car battery's negative terminal. (Better safe than sorry)
15. Tighten the 4 bolts holding radio bracket to car.
16. Re-install vent & radio frame. Re-connect the hazard warning signal switch connector.
17. Re-install instrument cluster surround finish panel
18. Re-install instrument panel right finish panel
19. Re-install instrument panel left finish panel
20. Re-install instrument panel lower center finish panel
21. Re-connect negative terminal of car battery.

Congrats! Now re-enter your favorite radio stations, pair your phone with radio using Bluetooth, and enjoy your new radio.

Optional: Installing a USB port near parking brake handle for easy access

(Instructions coming soon)

Before

After

Disclaimer: I'm sharing my research and experience for the benefit of the internet community. I'm not paid to write the content on this website, but hyperlinks to supporting retailers are automatically made into affiliate links, and if you purchase a product through these links, I may get a small commission on the sale.