DRL Disable Alone NOT SAFE for Aftermarket HID Retrofits
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      Member theshadow27's Avatar
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      DRL Disable Alone NOT SAFE for Aftermarket HID Retrofits

      SwedeSpeed P1 (C30, S40, V50, C70) HID Retrofit Index
      1. SKBOWE Plug-and-Play harness for P1 HID conversion
      2. Background info, general questions, and share your HID setup
      3. KBOWE How-To (Original 2009 Version) build your own PWM filter
      4. Original 2009 investigation and technical discussion on S40 HID issues
      5. ForceFed’s E46 D2S Bi-Xenon Projector Retrofit guide
      6. Rewire OEM Bi-Xenon headlights to work on the halogen harness
      7. DRL Disable Alone not enough for safe Aftermarket HID retrofits (you are here)





      For those who have given up following the 15+ pages of drama in the Aftermarket HID thread (or have arrived via Google) but have installed the DRL-Disable software update PN 30679690 in conjunction with installing aftermarket HIDs in their P1 Volvo (S40, V50, C30, C70n), this post is for you:

      New testing has shown that DRL-Disable software does disable DRL PWM, but does does NOT eliminate PWM completely. The PWM issue is discussed in detail in the main thread, please follow up there with general questions.

      In effect, when running HID retrofit on OEM wiring, the DRL software update is no safer for the WMM than leaving the LSM in position II at all times. So if you have a retrofit using a BOW3 or similar error code eliminator and DRL disabled, you are on borrowed time! Even if your setup is currently working, I suggest you add additional grounding and inspect/replace the eliminators on a regular basis (3-6 months with 55w, 3-12 months with 35w) to avoid burning out the WMM.

      For the sake of posterity, the actual results of the new and old testing are combined below:



      With DRL Enabled

      Light Switch Module Position = 0 (off)

      Day: 60% duty cycle / 8.5V Average (nominal)

      Night: 80-90% duty cycle (variable) / 13.2V (nominal)

      Light Switch Module Position = 1 (markers)

      Day and Night: 0% duty cycle (aka off)

      Light Switch Module Position = 2 (on)

      Day and Night: 80-90% duty cycle (variable) / 13.2V (nominal)



      With DRL Disabled

      Light Switch Module Position = 0 (off)

      Day and Night: 0% duty cycle (aka off)

      Light Switch Module Position = 1 (markers)

      Day and Night: 0% duty cycle (aka off)

      Light Switch Module Position = 2 (on)

      Day and Night: 80-90% duty cycle (variable) / 13.2V (nominal)



      Many thanks to Nick0matic and LizardOfBodom for their help in finally systematically establishing the operating parameters of the P1 CEM.


      Please direct general HID questions/comments to the HID thread - Please post here only if you have additional VIDA screen shots or oscilloscope measurements.

      Edit: Note that if you have not installed the DRL disable software yet, there is a How-To posted on skbowe.com: the DRL Disarm to reach the same effect: Basically by removing pin 6 (black/green) from the LSM connector - or cutting the wire - the CEM thinks that Position 0 is actually Position II, and all the DRL issues go away! Quick, free, effective.
      Last edited by theshadow27; 09-27-2017 at 03:48 PM.
      '05 S40 T5 AWD M66 sport/winter/ew. Michelin PS A/S+. 6000k 50w HID low/HIR1 high/full LED conversions. RiCA SW. Evoelate intake. IPD rear sway, skidplate, TCV.
      Writeups
      Full P1 (S40/V50/C30/C70) & P2 (S60/V70+R) LED conversion | P1 HID conversion & details | FM Modulators & interference | stalk cleaning | CEM Teardown

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