In this video I show you how to replace the voltage regulator on your BMW. This process is going to be very similar for a number of models. I'm working on E90 / E91 / E92 / E93Model Year: 2006 My GUESS is the electrical problems resulted due to low battery voltage. You may just have a bad battery-BMW will Always check to see if you have a strong battery before doing anything else . The IBS system can turn things off when the battery is weak and cause symptoms that are not directly related to the real problem a weak battery or charging system problems. Also cold is hard on batterys. electical e90 pdf BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > E90 will not start after new battery Google Search Search Forums Typically this malfunction occurs because you started the car, and then walked out of range of the sensor with the key fob. If that happened this procedure might re-enable your Comfort Access in the door handles: 1. Insert metal, mechanical key into door lock to manually lock and then unlock. 2. As the relay is the cheap bit I would replace it first, if the replacement energises then either the starter or possibly the CAS unit has a fault. The Magneti Marelli starter on my first X5 failed first symptoms were slow cranking even with a charged battery, then battery drain issues. Good spot Dave If you get a low reading at the battery and want to rule out a wiring fault, then proceed to measure at the alternator as well to verify. Yes, charging voltage. Which due to the IBS system in your car can be anywhere from 13.x to 15.x V at idle. Anything below 13.x is most likely a dead alternator. Earliest that you'll encounter this issue is around 60k miles (for me it was at 59,8xx one month ago). You'll get yellow/orange t-stat (overheat) warning then red and next will be the low coolant light (pictured by OP). For the record, you're looking at a $1000-2000 if you're experiencing a water pump & T-stat failure. 6 days ago · The fifth-generation BMW 320i, also known as the E90/E91/E92/E93, was produced from 2005 to 2013. It was available in sedan, coupe, convertible, and wagon body styles and was powered by a range of four-cylinder and six-cylinder engines, including a 2.0-liter four-cylinder engine and a 3.0-liter six-cylinder engine in the BMW 335i model. BMW E90 E92 Steering Click Clunk Noise: Actually An Easy FIXBecome a member and get exclusive discounts at 6vGzH.