Top 20 2005 Pontiac Grand Prix Questions & Answers

Question edited for clarity. Question moved from Misc to model category. Did you disconnect the battery or did the battery go flat recently? Is the security light flashing? Reset the alarm and engine immobilizer. Or you need an auto electrician to diagnose electronically using a pro grade scan tool computer. https://www.google.com/search?q=mobile+auto+electrician+near+me ..

It appears to be a combined unit ECM - PCM https://www.2carpros.com/questions/pontiac-grand-prix-2002-pontiac-grand-prix-ecm https://www.google.com/search?q=2005+pontiac+grand+prix+ecm+location&rlz=1C1QJDB_enCA643CA644&sxsrf=ALiCzsYL3LQCtTjZ3u4acFPbM4nsf1mZJw:1653191342112&source=lnms&tbm=isch&sa=X&ved=2ahUKEwifzsTVmfL3AhXVIc0KHVKXB5gQ_AUoAXoECAEQAw&biw=1920&bih=937&dpr=1 ..

Question edited for clarity. Question moved to sub category. Pictures https://www.google.com/search?q=2005+pontiac+grand+prix+ecm+location

2005 Pontiac Grand Prix ECM 3.8L Engine Computer (PCM ...

https://mintt.com > grand-prix-engine-control-module The 2005 Pontiac Grand Prix is usually located in the engine bay on the driver side, on the firewall or near the battery. There are several symptoms of a bad or ... US$212.00 · ‎In stock ..

not getting any comms through my obd2 scanner ?? What kind of scanner ? Full function one that can communicate with all the computers (modules) on the vehicle ? BCM ,IPC,HVAC etc.. Do you know how the electronics work on this vehicle , what happens when you turn the key to start? Circuit Description (Key Start) For ignition switch power modes refer to Body Control System Description and Operation in Computer/Integrating Systems. When the ignition switch is placed in the Start position a discrete 12 volts signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The BCM then supplies a class 2 message to the engine control module (ECM) / powertrain control module (PCM) notifying it that CRANK has been requested. At the same time the BCM is supplying 12 volts for the IGN 1 Relay / IGNITION MAIN PCM Relay closing it and supplying battery positive voltage for the CRANK Relay / STRTR Relay coil. The ECM/PCM verifies that the transmission is in Park or Neutral. If it is, the ECM/PCM grounds the control circuit of the CRANK Relay / STRTR Relay. When this occurs battery positive voltage is supplied through the switch side of the CRANK Relay / STRTR Relay to the S terminal of the starter solenoid.Do you know what power moding is ? Power Mode Description and Operation Power to many of this vehicle's circuits are controlled by the module that is designated the power mode master (PMM). This vehicles PMM is the body control module (BCM). The PMM controls which power mode (Run, Accessory, Crank, Retained Accessory Power, or Off) is active. Serial Data Power Mode On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle, the PMM is the body control module (BCM). The PMM receives 3 discrete ignition switch signals to differentiate which power mode will be sent over the Serial Data circuits. Relay Controlled Power Mode The body control module (BCM) uses the discrete ignition switch inputs ignition 1, ignition 3 and crank to distinguish the correct power mode. Once the BCM has determined the power mode selected by the vehicle operator it will energize the Ignition relay, Run relay and retained accessory power (RAP) relay, depending on which power mode is selected. Ignition 1 Relay The relay uses a Hot At All Times B+ power source derived from the underhood electrical center. The ignition 1 relay supplies a power signal to the following circuits when the Run or Crank power mode is selected: • AC clutch relay • ABS STG angle sensor • Antilock brake system (ABS) yaw sensor • Auxiliary power drop connector • Crank relay • Cruse control switch • Electronic brake control module (EBCM) • Engine control module (ECM) • Heating, ventilation, and air conditioning module (HVAC) • Ignition control module (ICM) • Instrument panel cluster (IPC) • Sensing and diagnostic module (SDM) • Transmission solenoid circuit Retained Accessory Power (RAP) Relay The RAP relay is energized when the Run or Accessory power mode has been selected. The relay uses a Hot At All Times B+ power source derived from the underhood electrical center. The B+ power source is protected by the 50 Amp BATT MAIN 2 fuse. The BCM also energizes the relay for 10 minutes after the vehicle operator transitions the ignition switch from Accessory to OFF or Run to OFF positions. The following circuits are controlled by the RAP relay: • Power sunroof • Power windows Your best bet , take it to a qualified repair shop .

Question edited for clarity. Question moved to vehicle category. In the link, but there should be a plug on the end of the wire. https://www.justanswer.com/pontiac/1me2c-installing-jet-performance-pcm-need-connect-its.html https://www.google.com/search?q=2005+pontiac+grand+prix+Bosch+o2+sensor+wiring+diagram and more here https://www.google.com/search?q=2005+pontiac+grand+prix+o2+sensor+wiring+diagram&rlz=1C1QJDB_enCA643CA644&sxsrf=ALiCzsZ1dzVr0QYKoKf0WHXB6TSuivB5Og:1651171283484&tbm=isch&source=iu&ictx=1&vet=1&fir=KoyFZi4l4Dpg9M%252Cdqxfo-6s42ElwM%252C_%253BbFv3PUFHH43ErM%252Cdqxfo-6s42ElwM%252C_%253Bm_hKvSB8JhfWLM%252CIQKVlFrAlzR4YM%252C_%253B4s60G2xw6LDTFM%252Cdqxfo-6s42ElwM%252C_%253BIB599Vnbp3uiSM%252CYyc0HJxTFFPeOM%252C_%253Bhz-k0_Jax90XaM%252C4AKpQV3oPz8qlM%252C_%253Bwu_oklKGks7rNM%252Cdqxfo-6s42ElwM%252C_%253BqplyDNappXKqTM%252Cdqxfo-6s42ElwM%252C_%253BaYDPWv13KNVyeM%252CwX1PN-fDq2TD7M%252C_%253BJVHAbfteMlwtPM%252CCZOzMmeqr-1z5M%252C_&usg=AI4_-kQQHNrvkKzOkFE57rsXX7x7IwerYg&sa=X&ved=2ahUKEwjDxcKutLf3AhWEWM0KHfdZAT0Q9QF6BAgeEAE#imgrc=m_hKvSB8JhfWLM ..

This sensor mounts on the front of the vehicle, behind the front bumper, on the frame rail.

2006-2008 Pontiac Grand Prix Front Airbag Air Bag Sensor ...

https://www.google.com/search?q=05+Pontiac+GP+air+bag+sensors+location ..

Turn Signal Lamps The STOP/TURN/HAZARD fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the turn signal lamps. When the turn switch is placed in the LEFT TURN or RIGHT TURN position, ground is applied from G202 through the turn switch, to the turn signal switch signal circuit and to the BCM. The BCM then applies battery positive voltage to front and rear turn signal lamps supply voltage circuits. The left front turn signal lamp is grounded at G100, right front at G101, left rear at G301 and the right rear is at G302. Turn Signal Reminder The driver information center (DIC) activates the turn signal warning as requested by either turn signal switch. The turn signal warning sounds when the following occurs: • The ignition is in RUN. • The turn signal switch is in either turn position, sensing, within 1 second, an open to battery positive voltage transition in the turn signal control circuit, left or right turn. • The vehicle has traveled a distance of 1.2 km (0.75 mi) by counting pulses in the rolling odometer class 2 message. The DIC turns OFF the turn signal reminder when either the ignition switch is turned to the OFF position, or the turn signal switch returns to the OFF position, sensing within 1 second, no transitions from open to battery positive voltage in either of the turn signal control circuits, left turn or right turn. My first step would be to hook up a factory scan tool an check for DTC'S - diagnostic trouble codes DTC B3948 Left Front Turn Signal Circuit Circuit Description Ground is applied to the turn signal switch. When the turn signal switch is placed in the turn left position, ground is applied to the body control module (BCM) through the left turn signal switch circuit. The BCM then applies a pulsating voltage to the LF and LR turn signal lamps through the LF and LR turn signal voltage supply circuits. What's the left rear lamp doing ? Flashing fast ? DTC B3950 Left Rear Turn Signal Circuit

check connection -ground-wiring

Under the car by either rite under the drivers seat under the car or under the car ride in front of the gas tank.

what is an aid button what do you want to hookup

I would go to google and see if someone has posted a video of the engine swap.

Why did you install a new ignition switch ? Lock cylinder part or electrical ? You have no idea of the complexity of the electronic's on this vehicle ,your best bet take it to a qualified repair shop. The body control module (BCM) uses the discrete ignition switch inputs ignition 1, ignition 3 and crank to distinguish the correct power mode. Once the BCM has determined the power mode selected by the vehicle operator it will energize the Ignition relay, Run relay and retained accessory power (RAP) relay, depending on which power mode is selected. Power to many of this vehicle's circuits are controlled by the module that is designated the power mode master (PMM). This vehicle PMM is the body control module (BCM). The PMM controls which power mode (Run, Accessory, Crank, Retained Accessory Power, or Off) is active. On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle, the PMM is the body control module (BCM). The PMM receives 3 discrete ignition switch signals to differentiate which power mode will be sent over the Serial Data circuits.

Having the vehicle checked for DTC'S - diagnostic trouble code's an doing diagnostic's for the code is the proper way to diagnose , not guessing . No you cant reset it or disengage it ,need factory or professional scanner .

Leaks get worse when engine is at operating temp and pressure builds. Rent a cooling system pressure tester and pressurize the system. Then you'll see the leak

Do you know how to voltage drop automotive electrical circuit's using a DMM - digital multi-meter ? Checking main power feed to fuse box etc.... loose connection , bad positive feed cable etc .. Do you know what wiring diagrams are ? Electrical distribution diagrams ? Electric Testing Techniques You Need to Know Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size. Under system click on electrical distribution then under subsystem click on power distribution . Click the search button then the blue link's . test the circuit's . Plus knowing how the systems work would be good . When you turn the key to start it send a low voltage signal to the BCM - body control module . The BCM sends a message to the PCM/ECM - engine computer to energize the starter relay . A lot of complex electronic's an electrical systems involved .

Typically if any lights are flickering it’s because of a loose ground wire.

Make sure you bleed from rear furtherist from master cylinder and make sure when your helper is in drivers seat to pump brake pedal 4x then hold, at that holding point you open bleed screw then close once brake pedal is on the ground. Repeat 5x then move to the opp side and do the same. Then to the front furtherist from master cylinder and do the same. Making sure the brake fluid is always topped up also. Also check all your conecters in the lines are not leaking

Must be a ground not hooked up/dirty connection at ground or a sensor or sensors not plugged in.

Check for power at the injector. Possibly plugged, replace.

Try resetting the alternator, if that doesn't work try changing the battery If you need further help, I’m available over the phone at https://www.6ya.com/expert/anik_29134a102eb94344