Question about 1991 Cadillac Seville

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Starter clicks but engine won't crank, starter tested ok. 1991 cadillac seville. bypasskey system recently by passed `1 month ago. no ecm or bcm codes.

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Is the battery weak?if good ck all grounds,then ck voltage from batt. down to starter.also make sure solenoid isnt loose on starter case.If you did bypass and it cranks then neutral switch or ignition switch could be worn.good luck

Posted on Jul 07, 2010

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I got a 09 pontiac g6 wont start.there is no crank no clicks when i turn the ignition on but the engine light is on


You have know idea how the starting system works , an with the engine light on your best bet would be to have it towed to a qualified repair shop .
When the ignition switch is turned to the Start position, the body control module (BCM) receives battery voltage on the ignition 1 voltage circuit, and less than 5 volts on the off/run/crank voltage circuit. The BCM supplies voltage to energize the RUN/CRANK Relay 32. The BCM sends a high speed GMLAN serial data message to the engine control module (ECM) that the key is in the start position. The ECM receives the message from the BCM, and also receives a serial data message from the transmission control module (TCM) containing the shift lever position. If the shift lever is in Park or Neutral when ignition switch is turned to Start, the ECM supplies voltage to the START Relay 31. The START relay supplies voltage to the S terminal of the starter solenoid, through the 30 A STRTR Fuse 26, in order to crank the engine.

Apr 08, 2017 | Pontiac Cars & Trucks

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2002 chevy trailblazer and it will not crank or start and the key has gotten stuck in the ignition. I also got a jumpstart and it still didn't start. What is wrong, Please?


Could be a number of thing's , can you do automotive electrical testing ? Do you know if starting is PCM / ECM controlled or BCM controlled ? Do you know what these are ? BCM - body control module , PCM/ECM - engine computer !
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.
Do you know what a park neutral safety switch is ? What do you mean key stuck in ignition ? Can't turn the key to off position , or you can an the key will not come out ?
Your best bet , take it to a qualified repair shop .

Apr 04, 2017 | 2002 Chevrolet TrailBlazer

1 Answer

My 2007 Uplander won't start. We've replaced to battery and starter relay. Still won't even click when trying to start.


How to voltage drop test starter motor circuit This is how a normal starting system use to work ! Not now , computer's involved , communication networks etc.....
Here is how your's works

For ignition switch power modes refer to Body Control System Description and Operation . When the ignition switch is placed in the Start position a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The BCM then sends a message to the engine control module (ECM) notifying it that CRANK has been requested. At the same time the BCM is supplying 12 volts for the IGN 1 relay closing it and supplying battery positive voltage for the crank relay coil. The ECM verifies that the transmission is in Park or Neutral. If it is, the ECM grounds the control circuit of the crank relay. When this occurs battery positive voltage is supplied through the switch side of the crank relay to the S terminal of the starter solenoid.

Sorry but your best bet would be to take it to a qualified repair shop ! Or the Chevy dealer . Could have DTC'S - diagnostic trouble codes stored in the BCM !

DTC P0615 Starter Relay Control Circuit

Circuit/System Verification
Ignition ON, verify that no starter relay, theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable starting.
? If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the scan tool BCM Starter Switch parameter. Place ignition switch in the crank position, the parameter should display ON.
? If not the specified value, refer to Power Mode Mismatch .
Transmission range selector in park , verify the scan tool ECM PNP Switch and TCM IMS parameters display Park/Neutral.
? If the TCM IMS parameter does not indicate Park/Neutral, refer to Transmission Internal Mode Switch Logic .
? If the ECM Park/Neutral parameter does not indicate Park/Neutral, refer to ECM Park Switch Circuit Malfunction.
Transmission range selector in park or neutral, attempt to start the vehicle. The starter relay should click and the engine should begin cranking.
? If the starter relay does not click or the engine does not crank, refer to Starter Relay Circuit Malfunction.

Power to many of this vehicle's circuits are controlled by the module that is designated the Power Mode Master (PMM). This vehicle's 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. The table below illustrates the state of these inputs in correspondence to the ignition switch position:

Mar 29, 2017 | Cars & Trucks

1 Answer

I change my 2002 Cadillac Seville engine and engine will not crank


check the wire's to the starter with a test light, have someone turn the key to the start position and see if the wire going to the starter is hot.
You must use a test light to check it...

May 03, 2014 | 2001 Cadillac DeVille

1 Answer

08 Chevy Cobalt wont start. Battery is good.?


Is there a warning light , padlock an car symbol lit when it won't start ? I assume it has to be a bad starter? Every time i jump the car it starts up fine.??? It wouldn't be a starter then ! Have the charging system check out . Have a voltage drop test on the starter circuit done . Test from the starter relay . check out videos on youtube , but don't assume anything . Test , Test Test .

https://www.youtube.com/watch?v=WMXENKujYtc&t=6s

Starter Voltage Drop

VEHICLE RELAYS Testing from the relay base

Plus you need to know how the starter system works for the vehicle your trying to diagnose . I 'am a GM tech , Chevy , Cadillac , buick , GMC. Have access to GM factory repair info. Been to a lot of GM training school's . The computers on this vehicle have a lot to do with the starting of the vehicle ,PCM - engine computer , the ignition switch is a low voltage input to the BCM - body control module , which will send a message over the GMLAN serial data communication network to the PCM to energize the starter relay or crank relay .The PCM also has to see a voltage input coming from the transmission range selector switch , showing it's in park or neutral , has to have correct fuel enable password from the theft module etc...
Also it take's is a little corrosion , lose connetion , lower then normal circuit voltage for problem to happen .
Factory service repair manual discription

Moving the ignition switch to the start position signals the body control module (BCM) through discrete inputs from the ignition transducer that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the engine control module (ECM) requesting engine start. The ECM receives a ground signal from the park/neutral position (PNP) switch or a signal from the clutch pedal position sensor notifying that it is safe to start the engine. Ground G105 supplies ground for the CRNK relay coil. The starter relay coil control circuit is then supplied voltage by the ECM closing the switch in the starter relay suppling 12 volts from the CRNK fuse to terminal A of the starter. Ground is supplied to the starter solenoid through the engine block.

The first step in diagnosing a problem like this , hooking up factory scan tool , checking for DTC'S - diagnostic trouble code's , checking inputs to control modules that are in charge of starting the vehicle .

Testing an knowledge is the way to a fix , an testing cost $$$$$


Mar 19, 2017 | 2008 Chevrolet Cobalt

1 Answer

2003 Saturn Vue with a identity anti theft system. Replaced my battery a few months ago. Couple weeks ago noticed a little difficulty starting up. Last week wouldn't start just clicking noise. Jumped...


Anti-theft system has nothing to do with it . Battery cables , maybe , Park neutral safety switch possibly ! With anti-theft system problem you wouldn't a click or anything , that is if the anti-theft disables fuel or the starter . Plus the SECURITY light would be on if it were a anti-theft system problem . Your best bet , take it to a qualified repair shop that knows how to do starter circuit testing >
Starter Voltage Drop
How to voltage drop test starter motor circuit

And what's this identity anti theft system ? No such thing ! The vehicle has a content theft an vehicle theft deterrent system !
This system disables fuel not cranking of the engine. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.
If the VCM/PCM does not receive the same password from the BCM as the last learned one, the vehicle will start and then stalls due to the Fuel Lockout.

May 17, 2017 | Cars & Trucks

1 Answer

1990 DEVILLE. Posted 6-14. New BCM, new fuel pump, new relay, still no fuel. Have tested wires, I get a brief 12 volts to grey wire on connector to fuel pump when key is turned on, then nothing. I can hear...


That is correct for initial prime,then fuel pump works off of crank sensor.Fuel pump is ussually controlled through ECM not Bcm.Have you checked for fuel preasure when you first turn on key,

Jun 15, 2009 | 1991 Cadillac DeVille

1 Answer

1991 Cadillac Seville wont turn over starter tested and is fine. Its drained 3 batteries in the last 12 months. Tryed banging on it and nothing.


Have your alternator tested too; if it has a sick diode, it can drain the battery and also shunt current away from the starter as well as damage the battery by applying unrectified voltage on one leg of the output. I replaced SIX (6) Delco alternators in nine years on a car built in '95. It would have been more except the engine failed at 57,600 miles and I junked the lemon.
If the starter solenoid is not integrated on your Caddy, it too can fail which will cause too much lost voltage trying to get to the starter. 

Apr 14, 2009 | 1991 Cadillac Seville

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