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Wiring diagram starting system ignition to starter relay wiring diagram

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Battery and all fuse links on one post of the solenoid and starter cable on other

Posted on Jul 18, 2009

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pcm bcm ignition staring diagram wiring ?????? First off what is staring ????? Do you mean STARTING system wiring diagram ??????? The PCM / BCM have nothing to do with the starting system on your vehicle. When you turn the key to the start position it sends B+ voltage through the transaxle range switch to the S terminal on the starter solenoid ,that's it . Use a test light ,voltmeter etc... With someone turning the key to start check for B+ voltage at the starter S terminal . Plus voltage drop test the heavy gage battery cable to the starter .
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Do you know how to test automotive electrical circuits ? Do you know what a electrical wiring diagram is. Have a DVOM - digital volt ohm meter ? How about a automotive relay , do you know what it is an how it works ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model ,engine . Under system click on engine , then under subsystem click on starting. Click the search button ,then the blue link . You will see all the componets involved in starting the vehicle. ignition switch , starter range switch , starter relay , PCM -powertrain control module . When you turn the ignition switch to the start position it sends a voltage signal to the PCM , this tells the PCM start is requested , in turn the PCM energize's the starter relay . This will close contacts inside the relay allowing B+ voltage at pin 30 of the relay to go to the starter solenoid . engaging the starter . Checking fuse's an power an ground , testing relay control . . Videos on youtube for electrical testing.
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When it won't start testing the electrical systems is the proper way to find a fix . Using a DVOM - digital volt ohm meter and power flow diagrams . Using voltage drop testing !
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Do you know what a wiring diagram is ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Click on engine under system then under subsystem click on starting .Then click on the search button , then on the blue link . This is a wiring diagram of the starter electrical circuit. Do you know what ignition switch is ? the electrical part. , how about the starter relay , transmission range sensor ! There is one thing you can try , move gear selector to neutral an see if it starts then . If that does nothing ,check for B+ voltage going at the starter relay . Jumping pins 30 & 87 at the relay socket , where the relay plugs into . will cause the starter to engage an spin the engine . If you look on the bottom of the relay you will see four sets of numbers 30 & 87 - 30 should have B+ voltage , 87 goes to the S terminal on the starter solenoid . An 85 & 86 are the control side .86 at the relay socket comes from ignition switch through the trans range sensor to the starter relay coil ( electro magnet ) . Watch these videos too .
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2005 starter wiring diagrams from ignition switch to starter soliniod


The ignition switch does not go to the starter solenoid . Pin 87 at the starter relay sends B+ voltage to the starter relay . Do you know what a starter relay is an how it works ? The ignition switch is an input to the PCM - engine computer . When the PCM sees this B+ voltage from the switch it energizes the starter relay sending B+ voltage to the starter solenoid . http://www.bbbind.com/free_tsb.html free wiring diagrams !

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Do you know how your starting system works ? Do you know about the starter relay ? All power comes to an through the starter relay . The park neutral safety switch is on the transmission. VEHICLE RELAYS Testing from the relay base If you have a anti-theft system problem the engine computer - PCM will not let the starter engage . Go to www.bbbind.com for a free wiring diagram of the starter circuit on your vehicle .

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While driving the a/c quit getting cold and the gearshift orange indicator light disappeared. The truck ran to its destination and I shut it off. I tried to start it again but it would not turn over. I...


Starter motor relay , transmission range switch , wiring ! Do you know what a wiring diagram is ? How to read one ? How to use a DVOM - digital volt ohm meter ?
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do you know what a relay is ? how to test one .
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You can view free wiring diagrams here http://www.bbbind.com/free_tsb.html enter the vehicle info. year , make , model , engine size . Under system click on engine , then under sub system click on charging system . click search button ,one link will pop up , click on it . First diagram is starter circuir . If starts jumping at the starter the problem is on the control side . trans range switch , starter relay ,blown # 6 40 amp fuse in the under hood fuse / relay center .

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Pontiac vibe ignition switch? Intermittent dash


Basic electrical problem . loose connection on a ground circuit ,high resistance . There are no magical fixes for automotive electrical gremlins . Finding electrical wiring diagrams an voltage drop testing the electrical circuits is the only way to find the problem .
When the ignition switch is placed in the Start position 12 volts is supplied through the Park/Neutral Position Switch or Clutch Pedal Position switch to the switch and coil side of the Starter Cut Relay. If theft is not active the Theft Deterrent Module grounds the control side of the Starter Cut Relay closing its switch. Power then travels to the coils side of the ST Relay with ground at G200 closing the ST Relay. Power then flows from the Main fuse in the Fuse Block - Underhood through the switch side of the ST Relay and then to the S terminal of the Starter Solenoid. Ground is found through the engine block.

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Free wiring diagrams here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size. Under system click on engine then under subsystem click starting . I would start with a voltage drop test of the main battery cable to the starter motor.

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( 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 .
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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 .

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when looking at it from the front the most left is from the battery, now going right from there the little pin is from ignition, basically to flip this giant switch on. next little pin goes to your fuel shut off relay, it will turn on that relay to send power to your pump while cranking, next is the large out. far right. that goes to your starter.

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