Question about 2002 Saturn S-Series

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A few days a go my locks on my 2002 saturn started fluttering and making clicking sounds. I can only unlock my car with the key now and all the locks have to be unlocked and locked manually. Then a few days after my security light started coming on and the car wouldn't start, it took my 10-15 minutes to start it. This morning however it did nothing when I tried to start it, my lights work and so does my air conditioner and radio, so it is not my battery, and my husband replaced the fuses. What is going on? And what should I do?

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  • Saturn Master
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Do you or your husban know how to trouble shoot automotive electrical systems , using a wiring diagram and a DVOM - digital volt ohm meter ? Do you know how to trouble shoot electronic control modules an circuitry ? The BCM - body control module controls the power locks , anti-theft system . The first step in diagnosing problems like this involve hooking of a scan tool that can pull BCM codes . No auto parts store can check these codes .
Door locking/unlocking, by remote keyless entry (RKE) or driver/all door lock switches, is controlled through the BCM.
When a driver door unlock has been requested, the BCM switches circuit 694 to battery voltage. This energizes the driver door unlock relay which supplies power to the driver door lock motor. Grounding is achieved through the closed contacts of the all-door lock relay. Grounding is also achieved through the windings of the all-door lock motors and the all-door unlock relay.
When an all-door unlock has been requested, the BCM switches circuit 194 to battery voltage. This energizes the door unlock relay which supplies power to the all-door lock motors. Grounding is achieved through the closed contacts of the door lock relay. Grounding is also achieved through the winding of the driver door lock motor and the driver door unlock relay.
When an all-door lock has been requested, the BCM switches circuit 195 to battery voltage. This energizes the door lock relay which supplies power to all-door lock motors. Grounding is achieved through the closed contacts of the door unlock relay and the BCM.
Lock/Unlock power application is limited by the BCM to 7 seconds to protect lock motors.

The passlock sensor is powered by circuit 1459. The passlock sensor is grounded by circuit 1835. Passlock sensor data is supplied to the BCM by circuit 1836.
The passlock sensor data supplied to the BCM is in the form of V-codes or voltage codes. When the proper ignition key is turned in the ignition switch, the correct V-code is supplied to the BCM. The BCM responds by sending a serial data password to the engine controller allowing the engine to run.
Under a tamper condition, a specific V-code is supplied to the BCM. The BCM will send a class II message to the PCM disabling the fuel injectors.

Electric Testing Techniques You Need to Know

ECM Inputs and Outputs Diagnosis free wiring diagrams ! Enter vehicle info. year , make , model an engine size . Under system click on Body & Accessories , then under subsystem click on Body controls .Then click on the search button , then the blue link . You will see all inputs and outputs from the BCM . Check B+ voltage at the door lock switches . Check door lock fuse 20amp . Check door lock an unlock relays .

Also test the starting circuit !
How to voltage drop test starter motor circuit

Posted on May 10, 2017


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Posted on Jan 02, 2017

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SOURCE: 2003 Saturn Ion will not start. Security lock is on.

You can do a 30 min relearn that should allow your car to start. 12185916466 call me!

Posted on Dec 23, 2008

  • 186 Answers

SOURCE: Power door locks going crazy

One of your door lock inside switches are bad.Find the one that doesn't feel right when you push it in either lock or unlock.The internal spring is broke causing the lock relay to keep try to lock or unlock until it gets hot & protects.

Posted on May 10, 2009

  • 5 Answers

SOURCE: 98 saturn sl1 won't start

If the problem occurs after the car has been driven long enough to reach normal operating temperature, the problem is the starter. If the 'no crank' occurs cold, retest the battery.

Posted on May 11, 2009

  • 3854 Answers

SOURCE: Saturn LS1 2000 wants to start but won't

The fab key activates the security system in the car, the ignition pass lock may need to be reset to your ignition key's. It Takes about 30 min to do. Try resetting the pass lock to read your ignition keys. 30-Minute Learn Procedure 1. Turn ON the ignition, with the engine OFF. 2. Attempt to start the engine, then release the key to ON; the vehicle will not start. 3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF. 4. Turn OFF the ignition switch, and wait 5 seconds. 5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK. Important: Turn the Ignition Switch OFF. The vehicle learns the Passlock Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle. 6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password. 7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles. Without a scan tool you may have momentary starter interruptions while history clears itself. Good luck and hope this helps. The ignition keys has a resistor value for the ignition to read and after a few years the resistance may change and the Pass Lock has a had time reading it's value so you have to reset the pass lock to read the keys again.

Posted on Jun 12, 2009

  • 66 Answers

SOURCE: 02 saturn l200 starts then dies immediately

try your spare key it sounds like the transponder in the key is going bad

Posted on Jun 29, 2009

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I had this same exact problem in a family member's Saturn. If you are opening the door with the key and not using the key FOB to unlock the doors, then the security system will not allow you to start the car. You will notice when this happens that the dome light will blink and you'll hear the relay in the BCM clicking.

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