New testing has shown that DRL-Disable software (30679690) does disable DRL PWM, but does does NOT eliminate PWM completely. The PWM issue is discussed in detail on the issues page.

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.

Original Post:http://forums.swedespeed.com/showthread.php?398353-DRL-Disable-Alone-NOT-SAFE-for-Aftermarket-HID-Retrofits