which engine, post VIN and we tell you.or tell dealer parts page you vin and like magic it tells you what engine is there,most times this sensor is next to the thermostat housingbut not all times.( like reverse flow rad/engine)wiki same name see 2.4 L LE5 I4 (China) 3.0 L LZD V6 (China) 3.6 L LY7 V6 3.8 L L26 V6 5.3 L LS4 V8 hark
Question edited for clarity.Question moved to model category.Question translated from Spanish to English. We are a North American website, we only speak English.https://translate.google.ca/?sl=auto&tl=en&text=2005%20Buick%20Lacrosse.%20Como%20puedo%20desactivar%20la%20alarma%20de%20un%20auto.&op=translateTo deactivate disconnect the battery.You can't deactivate / Bypass it. The system has two computers and a module stopping you trying what you are trying to do, drive the car without proper credentials. You have to fix it, not find away around it.Resetting the system1-Turn ON the ignition, with the engine OFF. 2-Attempt to start the engine, then release the key to ON (vehicle will not start). 3-Observe the SECURITY telltale(this is the security light), after approximately 10 minutes the telltale will turn OFF. 4-Turn OFF the ignition, and wait 5 seconds .Feb 11, 2018Theft deterrent is on and my 2005 buick lacrosse will not..https://www.youtube.com/watch?v=74AGNqY7Mm8
Question edited for clarity.
Question moved to model category.
A 'Smoke Test' at a garage. They disconnect a hose and attach a smoke generator and under light pressure the smoke escapes where the leak is. The test takes about 2 hours.
Here are some other ideas
Where is the fuel pressure sensor located?
The sensor is part of the fuel pump assembly and is mounted on top of the tank or inside the tank. It's part of the evaporative emissions system (commonly referred to as "EVAP") and reads pressure in the fuel system to detect evaporative leaks, such as a loose or faulty gas cap.
I had a similar issue and queried it twice with the dealership and my tyre guy. The tyre guy was the most helpful told me that the ECM looks for the temperature to rise so many degrees in a certain number of minutes and points to a failing thermostat. Like you I said my heating works fine. The Engine Light bugged my so the next time I got my Winter/Summer tyres changed, I had the thermostat changed and the problem was fixed. You need a new thermostat.
Headlamps
You can use the headlamps two different ways.
• Place the headlamp switch in the HEAD position for normal operations
• Place the headlamp switch in the OFF position for automatic lamp control (ALC) operation. During ALC the low beam headlamps are ON for daytime running lamp (DRL) operation in daylight conditions at reduced intensity or low beam headlamps ON at full intensity with exterior park lamps ON in low light conditions.
The body control module (BCM) applies a pulse width modulated (PWM) voltage to the headlamp module and high beam relay in the underhood fuse block. The ground for the headlamp module is supplied from G113 or G115. For normal manual low beam operation when the headlamp switch is place in the HEAD position, ground from G202 is applied through the headlamp switch and to the BCM through the headlamp switch headlamps ON signal circuit. The BCM then applies a PWM voltage to the headlamp module/high beam relay voltage supply circuit. The headlamp module then applies battery positive voltage through the left front (LF) and right front (RF) LO Beam fuses to the left and right low beam headlamps. The ground for the left headlamps is supplied by G101 and the ground for the right headlamp is supplied by G100.
For high beam operation, ground is applied at all times to the headlamp dimmer switch from G202. When the headlamp dimmer switch is placed in the HIGH position, ground is then applied through the headlamp dimmer switch signal circuit to the BCM. The BCM then applies a ground to the headlamp high beam relay control circuit. This energizes the HI Beam relay, the relay then applies battery positive voltage through the LF and RF HI BEAM fuses to the LF and RF high beam headlamps. The ground for the left headlamps is supplied by G101 and the ground for the right headlamp is supplied by G100.
The BCM then sends a class 2 message to the instrument cluster in order to illuminate the high beam indicator lamp. If the headlamp switch is left in the HEAD position, the inadvertent power control feature will turn OFF the headlamps after 10 minutes after you turn the ignition switch to the OFF position. If you place the headlamp switch in the head position after the ignition switch has been turned OFF, or if the ignition switch is in ACCY position, the headlamps will remain ON until you turn them OFF or until the battery runs dead.
