Question about 2002 Pontiac Grand Am

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No start at times , ac fuse blows at same time. according to wiring diagrams , same fuse to bcm ,both crank sensors replaced

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Sounds like you have a wire problem.

Posted on Jun 28, 2009


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Need the wiring diagram for 2005 Chevy trailblazer underhood fuse block, starting circuit.

Do you know if it is ECM/PCM or BCM controlled ?
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.

Free wiring diagrams here Enter vehicle info. year , make , model and engine size . Under system click on engine ,then under subsystem click on starting . Click the search button ,then click the blue link .
If you look at the diagram you will see the ignition switch ,when in start it sends B+ voltage to the ECM/PCM or depending on which system or engine to the BCM . When it see's this input it will energize the starter relay located in the under hood fuse box. This happens if the control module in charge see's another input from the PNP- park neutral position sensor and if no anti-theft system problems .
Good luck !

Sep 30, 2017 | Cars & Trucks

1 Answer

My wh statesman keeps blowing engine/bcm fuse. using bigger fuse allows it to start but blows again shortly after

Don't keep trying bigger fuses. It will only cause more problems, like burnt wiring that will need replacing, or starting a fire.
You either have an electrical component that is shorted and causing too much power draw, or you have some open wire that is shorting to ground by touching metal.
You or an electrician will need to look at a wiring diagram to see what all is on that circuit that is blowing the fuse. Then start taking one part of it loose at a time to try and isolate the problem. See any smoke or smell plastic burning when the fuse pops?

Dec 31, 2016 | Cars & Trucks

1 Answer

06 solstice AC blower not blowing any air . replaced the blower motor, the relay, the resistor motor that controls the speeds still no air blowing through the vents on any speed what could it be

Instead of replacing parts did you test the electrical circuit ? fuse's in the BCM, HVAC fuse's 10 an 15 Fuse box under the hood BCM fuse # 4 30 amp . Do you know how to use a DVOM - digital volt ohm meter . How to do basic automotive electrical tests , how to read a wiring diagram etc.... Do you know what an where the BCM is ? There are videos on youtube on basic electrical circuit testing . Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts Free wiring diagrams

Aug 31, 2016 | 2006 Pontiac Solstice

1 Answer

My 99 olds intrigue just won't turn over like my battery or something dead

How is the battery ? Do the headlamps shine bright ? Did you check the crank relay an the crank fuse 40amp ? one of the big one's ,maxi fuse . Under hood fuse / relay box . Check to see if voltage is coming through the transaxle range switch.

When the ignition switch is on, battery voltage is applied to one side of the crank relay in the underhood accessory wiring junction block through circuit 3, the PCM-BCM Fuse in the fuse block, and circuit 439. When the ignition switch is turned to START, voltage is fed to the powertrain control module connector C2 terminal 23 through circuit 5, the CRANK SIGNAL Fuse in the fuse block, and circuit 806 through the underhood accessory wiring junction block. Power is always provided from the CRANK MaxiFuse in the underhood accessory wiring junction block to the common side of the crank relay contacts. When the powertrain control module sees the crank signal and determines that conditions are OK for a crank, it supplies ground through circuit 625 to the crank relay. The crank relay now has both power and ground to the relay coil, causing the relay to pull in. When this happens, and the gear selector is in either PARK or NEUTRAL, the power at the relay common contact is passed through circuit 1737, the transaxle range switch and circuit 6 to the S terminal on the starter solenoid.
Passlock Theft Deterrent System
This vehicle is equipped with the Passlock theft deterrent system. This system contains a Passlock sensor. The Passlock sensor is part of the ignition lock cylinder assembly. The Body Control Module (BCM) interfaces with the Passlock sensor.
When turning the ignition switch to the START position with the proper key, the Passlock sensor generates an analog voltage signal, which is sent to the BCM. This analog voltage signal is of a specific value to the vehicle, and varies from vehicle to vehicle. When attempting to start the engine, the BCM compares a preset stored analog voltage value with the signal coming from the sensor. Because both values match, the BCM sends a fuel enable password via the Class II Serial Data Line to the Powertrain Control Module (PCM). As a result, the PCM enables the crank relay, and allows fuel delivery to the engine.
When attempting to start the engine by means other than using the proper key in the ignition switch, the Passlock sensor sends a analog voltage signal of a different value. The BCM compares the preset stored analog voltage value with the signal coming from the sensor. Because both values do not match, the BCM sends a fuel disable password via the Class II Serial Data Line to the Powertrain Control Module (PCM). As a result, the PCM disables the crank relay, and does not allow fuel delivery to the engine.
For more information regarding the Passlock theft deterrent system, refer to Theft Deterrent in Body and Accessories
This starting system is computer controlled , if you are not familiar with this I suggest you take a GM dealership or an ASE certified repair shop .

Nov 28, 2015 | Cars & Trucks

1 Answer

Why my Suzuki sx4 ac compressor not working?

manual A/C system or the fully auto system? option?

lots and lots of reasons, i can list them all , im the electric guy.
08 SX4 , (USA spec car)
answer 1: get it serviced? not an options? do say? we cant guess
what your question is, why, ? see #1 below for users DIY.
so is the compressor dead , on engine.

  1. a/c fuses blown to any A/C device, includes blower, in heater.
  2. A/C relays bad.
  3. High/low pressure switch tripped open (loop issues (Freon(tm)
  4. AC amp (logic box) sees errors, on any of 6 inputs.
  5. they all worked before, all cars, but not now for cause.
now the step 4 elaborations..
the AMP cuts the compressor fan and clutch for many reasons,
most not for your cause. but is important all.
why,. because those wires there can fail, or even fall off.
on the 2008 the AMP is now BCM/PCM/HVAC control module
the first step is after fuse checking is the do a full OBD2 one
SCAN on the PCM port. see if there are DTC errors. (do that now)
logic fails. BCM controls the front fan (cond) or PCM does on manual AC option.
  • blower voltage dead. (Blow logic failed)
  • engine overheated (or sensor lies) "wires fell off?"
  • engine overloaded, a/c cuts at crank, and wide open throttle.
  • hi/lo switch cuts out, protecting loop from DAMAGE.
  • lots of sensors can fail here, scan it?
  • outside air temp, too cold to run A/C? (auto system)
  • evap core icing up sensor, shows too cold, near 32f.
  • The manual system uses PCM to operated the 2 main AC relays as a slave to the AC brain box. but is BCM on fancy auto system.
  • not scanning the PCM/BCM now, you will FAIL.
The manual system is below. seen in the FSM book.
the tests are easy do you want me to gue$$ or TEST.


Feb 28, 2015 | 2008 Suzuki SX4

1 Answer

My ac 7.5 fuse keeps blowing when i push ac button in car

When a fuse blows you either do not replace it ,or replace one time
It blows for a reason find out why !!!!
You go to wiring diagrams starting at that fuse & go down the entire circuit until you understand it
Then pick a test point & the most logical part that would blow
a fuse
That is usually a high current item such as a motor,heater relay or whatever LOAD is in that circuit, that is there to use lots current & perform a task.

Aug 12, 2013 | 2000 Toyota ECHO

1 Answer

Diagram of a 2000 chevy express wiring of a starter

( one question i have is every time the ignition fuse blows do i need to replace the starter relay? ) NO ! You have a dead short to ground on one of the circuits that fuse feeds. Do you know how to find a short circuit ? Video's on youtube show how. The fuse that blows ,is it IGN - A 40 amp. located in the under hood fuse/ relay center ? That fuse feeds B+ voltage to the ignition switch ,which powers up other thing's ,fuse's etc.. Not just the starter relay ! I see five other fuse's that get power from that fuse when ignition switch is in the start or run position . In the I/P fuse panel the gauges fuse #4 10amp , air bag fuse #10 10amp , turn b/u fuse #16 20amp. , Plus trans fuse #20 10 amp ! Pull out these fuse an try to start the van. if the ignition fuse doesn't blow the problem is in one of these other fuse circuits. There is one more fuse that get's B+ power from the ignition switch and ign A fuse ,crank fuse fuse #8 10amp. this powers the control side of the starter relay .
You can find a free wiring diagram here Enter vehicle info. year , make , model and engine . Under system click engine , under subsystem click starting. Click the search button then the blue link.
If you pull those fuse's i mention and it still blows the fuse look for a shorted ignition switch or wiring from ignition to the starter relay , not the relay itself. Park neutral safety switch . Isolate the circuit , pull the relay out of it's socket ,pull the crank fuse #8 in the I/P fuse box. with a ohm meter check to see if that part of the circuit is shorted to ground. Do you know how to do that ? Do you have a volt ohm meter ? You can buy one cheap at parts store .

Sep 14, 2017 | 2000 Chevrolet Express Cargo

2 Answers

Volkswagen Polo hot start problem

1) see the diagram
2) use the scanner and computer test, this will guide a exactly problem
3) reset the igntion timing, it doesnot matter if your system ha BCM, adjust to accoridng the specification manaufacturer, because the BCM runt according to the information recorderd. remember the BCM =CPU.
4) test the sensor cam/crank with VOM see the diagram.
5) the head gasket i blown, valve timing is incorrectly set. the exhaust system is blocked.

Jul 18, 2012 | Cars & Trucks

1 Answer

My GMC safari 2004 has been blowing Ignition 1 fuse (40 amps) at the moment I turn key to start position,even without starter disconnected it blowed but i replaced the fuse and i removed the starter r

The problem could be a shorted park netual safety switch . Do you know what a wiring diagram is ? It shows all the componets involved in a electrical circuit ! You IGN.1 fuse 40amp , GM calls it IGN A fuse 40 amp . It feeds the ignition switch and pin 30 at the starter enable relay .When you turn the key to the start position it sends B+ voltage to #8 crank fuse , located in the I/P fuse box ,from there it goes to the park netual safety switch , to pin 86 or 85 of the starter enable relay ! If you pull the relay out of the fuse box an look on the bottom you will see this four set's of numbers ,30,87 & 85 ,86 You can test at the fuse box where the relay plugs in . Here is a video on how to test . The guy presenting the video uses a horn circuit , but it works the same way . It happens a lot , the park netual safety switch shorting out . It may or may not be the problem . VEHICLE RELAYS Operation Diagnosis
Here is a web site for free wiring diagrams Enter your vehicle info . then under system click on engine , then under subsystem click on starting . Then click on the search button an a link will pop up , click on it .You will see all the componets , connections , wiring colors etc... for the starter circuit for your vehicle .

Apr 17, 2017 | 2004 GMC Safari

1 Answer

I have a lhs 1996 Chrysler. The car wont start and the engine fuze burns out.

I also have a 96 LHS that randomly blows the 20 amp ECM fuse. If this is what you are referring to, the problem may be in one of your ECM sensors. 1-Start by unplugging all ECM sensors (Temp, Cam, Crank, 2-O2, TPS, etc.) and replace the fuse. 2-Crank the starter (the car will not start) and see if the fuse blows. If it does you probably have an electrical problem with the ECM. 2-If the fuse does not blow, plug in only the cam sensor and start the car; it will idle rough and the check engine light will come on. If the fuse blows, the problem is the cam sensor or wiring to it. 3-Continue plugging in sensors one at a time and try starting. When the fuse blows, you will know which sensor and/or wiring to the sensor to check. This process of elimination has worked twice for me.

May 16, 2010 | Cars & Trucks

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