Question about 1998 Chevrolet K1500

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Neutral start switch

Does the neutral start switch send a ground to the start relay.? What wire does so?

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  • Chevrolet Master
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No, the starter is grounded to the engine block, . The neutral safety switch, Or gear select switch, is the midpoint for the 12v crank signal from ignition switch to the starter solenoid.

Posted on Feb 14, 2014

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Posted on Jan 02, 2017

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SOURCE: 94 s-10 blazer won't start

The 92 S-10 I had did not have an emergency shut off.Yours may, or may not have, depending on what previous owners may have done to the vehicle.

You need to get a factory service manual (not Haines or Motors or Chilton) to diagnose the problem, Most larger repository libraries have them. The FSM's have complete troubleshooting guides.

Posted on Jan 24, 2009

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Posted on Aug 20, 2009

dj_relly999
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SOURCE: I Need 4L60E Neutral Safety Switch Wiring diagram

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Posted on Oct 19, 2010

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1 Answer

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
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 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

Where is the safety switch for a 2006 chevy malibu


Safety switch ? For what ? Park neutral safety switch ,is this what you mean ? Your vehicle not starting ? There is a lot more involved then just that switch.
Circuit Description
For ignition switch power modes refer to Body Control System Description and Operation. Once the ignition is placed in the Run/Crank position, the control circuit of the Run/Crank relay is grounded by the body control module (BCM). With the Run/Crank relay switch closed, battery positive voltage flows through it and on to the park/neutral position (PNP) switch. With the PNP switch in either the Park or Neutral position, battery positive voltage will flow to the starter relay coil supply voltage input terminal of the powertrain control module and the coil side of the starter relay. Placing the ignition in the START position sends a message to the engine control module (ECM)/powertrain control module (PCM) requesting engine start. If the ECM/PCM has determined that the transmission is in Park or Neutral and theft is not active, it will ground the control circuit of the starter relay. Battery positive voltage will then flow through the switch side of the starter relay to the S terminal of the starter solenoid, cranking the engine. For remote vehicle start (RVS) information, refer to Keyless Entry System Description and Operation.

May 25, 2016 | Cars & Trucks

1 Answer

Why wont my car start gauges and lights come on but wont crank no power going to soelinoid wire


If the security system has been reset ( no light on/flashing ) you may have a neutral safety switch problem, Will the vehicle crank over in neutral? In most cases, the neutral switch grounds the starter relay and allows it to operate. Does the starter relay connector have 2 powers? One constant and one with key on/cranking? If these power supplies are there, suspect the ground side of the relay to be the problem and possible neutral safety switch

Jan 20, 2016 | 2000 Ford Taurus

2 Answers

Lots of power, dash lights up but no ignition power to starter, relay changed, neutral start switch changed, fuses good.


Well, looking at the schematic, there is the IGN A (Fuse 6) in the under-hood fuse block feeding power to both the ignition switch and to the NO contact of the starter relay. Turning the ignition switch to the START position sends this voltage thru the CRANK (Fuse 8) in the instrument panel fuse block and thru the PARK/NEUTRAL position switch, thru the starter relay coil to ground. This should activate the Starter relay and pass voltage to the starter solenoid to ground, activating it. One the starter solenoid activates, batter power is sent to the starter motor, activating it. If, as you say, the fuses are good, the starter relay was replaced and is good, and the Park/Neutral position switch was replaced and is good, then then only items left are the ignition switch itself, the starter solenoid/motor, or the wiring of the circuit.

Mar 12, 2015 | 2000 GMC Yukon XL

1 Answer

2000 chev wont start at key


I think the purple wire (or maybe the yellow) from the neutral safety switch goes to the coil side of the starter relay, turning it on so power is sent from there to the starter solenoid. You could check for this signal to the relay with a test light. The key must be held in start while you probe the other two terminals for the relay. If the signal is there, either a bad relay or the coil side of relay is not grounded properly. It is possible that the coil side ground is the neutral safety switch-grounding the relay's coil side only in park or neutral-in which case the nagging light on shifter (between off and run, it only works?) may be telling you the safety switch is the problem.

You may need to look at a wiring diagram, Greg. But the starter relay is the last component in the start circuit before the starter solenoid. From battery to ignition switch to "crank" fuse to neutral safety switch to starter relay to starter solenoid to starter-and back to battery through ground. That is the start circuit. Just that the wiring tying them all together makes it complicated.

Apr 10, 2014 | 2000 Chevrolet Silverado 2500

1 Answer

If the ignition switch fuse, starter relay, battery, and starter are all new, why wont my jeep crank


Here are some possible reasons:

Park/neutral switch is open.
Poor ground connection to starter.

You can test the park/neutral switch by either jumping the solenoid (connect the hot terminal to the start terminal to see if the starter cranks--if it does, the ground is good) or by interrogating the starter relay socket. To interrogate the relay socket, use a 12 volt test light connection the clip to battery positive. Probe the socket terminals with the test light. If only one terminal lights the light, your park/neutral switch is bad or the start wire to the solenoid is bad.


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Feb 01, 2012 | 1997 Jeep Grand Cherokee

1 Answer

1999 Chevy Express not starting. Van does not turn over. Accessories work fine. No drain on lights when attempting to start. Where is the Neutral Safety Switch? And what side of vehicle is starter mounted?...


You can test right from the starter relay ,located in the under hood fuse relay box . You want to know if the starter is good or bad or if the control side is the problem . Turning the ignition switch to start sends B+ voltage to the park neutral safety switch an through the coil side of the starter relay to ground ,if the park neutral switch is good . Try moving the gear selector into neutral to see if it starts then .
Looking at a wiring diagram would be a good first step in the diagnostic process. Free wiring diagram's 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 on starting . Click the search button then the blue link . Pull the relay an look at the bottom , you will see four numbers . 30 - 87 & 85 - 86 . Take a piece of 12 gage wire ,jump where 30 an 87 plug into the relay socket . If the starter is it will spin the engine over .

Oct 16, 2017 | 1999 Chevrolet Express

2 Answers

I have a 1992 jeep Cherokee that has a ground issue on the starter relay. i get power from the ignition switch and can start it with a paper clip. i am looking for a diagram to trace the brown with yellow...


the control side of relay, needs voltage and ground. As you can see, for automatic it grounds through neutral switch. For manual tranny it appears to be chassis ground. For chassis ground, I just use a redundant ground, it works for me.
starter relay-jc2kzzcm5pd40lvznzjulhkv-1-0.jpg

Nov 19, 2017 | 1992 Jeep Cherokee Sport

1 Answer

2000 Odyssey won't start. We turn the key in the ignition and all the lights on the dash light up, but it doesn't crank. We've had the problem for a couple of weeks, but can always get it to start. ...


Try putting the gear selector in the neutral position . park neutral safety switch . Wouldn't need reprogramming , if it did you wouldn't be able to do it . Dealer only . Your best bet mite be to take your vehicle to a qualified repair shop any way . Viewing wiring diagrams for the starter circuit an using a DMM - digital multi-meter to test B+ power & ground's is how to find a fix. Do you know what a wiring diagram is ? How automotive electrical circuit's work ? How to use a DMM.
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 engine then under subsystem click starting . Click the search button then the blue link . Looking at the diagram i see the ignition switch supplying B+ voltage to the starter cut relay ! Do you know what a relay is ? If the B+ can't make it through the coil side of the relay to the park neutral switch to ground the relay will not energize an close the contacts an send B+ voltage to the starter solenoid . You can test at the relay for B+ control from the ignition switch . Video's on youtube on checking relay circuit's

Dec 05, 2017 | 2000 Honda Odyssey

2 Answers

When I turn the key the relay starts to click.


Ford loves that relay.. Jump the two big posts on the relay. the starter should crank. the little post is from your ignition switch. Jumping the two large terminal bypasses the relay. Make sure the vehicle is in neutral with the brake set.Once you know how to do that, try to key dtart in park, then neutral. If it won't do anything, Your neutral safety switch is defective.
If it will start in any gears, again bad neutral switch. Be careful and good luck. Use a jumper cable to jump the two posts. Anything smaller can get you shock or burned.

Sep 19, 2009 | 2002 Ford F150 Regular Cab

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