Question about 2003 Chevrolet Astro

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My 2003 Astro power locks stopped working and i can't get the back hatch open. Don't know if it is a relay or motor or what. Where should I start?

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  • 378 Answers

Driver side system

Posted on Dec 12, 2012

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Posted on Jan 02, 2017

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SOURCE: 1999 chevy astro locks dony work?

Lock actuator on the rear hatch may be bad, I had to replace 3 actuators all at one on my van. I have the same problem with my drivers door you are having with your doors, today I'm gonna pull the door panel off and check the wiring and voltage.

Posted on May 10, 2009

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SOURCE: 2000 chevy astro van electronic door lock problem

Try to replace fuse #13

Posted on May 22, 2009

mechanicm639
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SOURCE: windshield wipers quit working on 2003 chevrolet trailblazer. relays and fuses are okay.

There were some issues with ignition switches in those vehicles.It is easy to change and does not cost but about $30. Remove the column covers, unplug the switch, and depress the 2 white tabs holding it in place. Good Luck

Posted on May 23, 2009

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SOURCE: Need location of power door lock relay on 2002

If your door locks are not working and your cigarette lighter is also not working the fuse is burned out. On my 2001 astro van it is #13 in the fuse box under the steering wheel. I have replaced mine and so far no problems. Good Luck.

Posted on May 29, 2009

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SOURCE: power locks for rear doors and hatch not unlocking

you have two relays on the interior fuse block one for locking and one for unlocking. Swap them and see if the problem is now such that they will not lock. If so you have your answer.

Posted on Aug 30, 2009

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Not sure about your car, but on my Chrysler mini van the same problem happened. The problem was not the motor but the body control module. The unit had 2 relays, but the BCM actualy controls the unit. To replace the BCM was $450. I bypassed the problem by installing an on/off switch inside the car and activated the motor by by passing the BCM at the relay. That was 3 years ago, still works great. Your BCM may be the problem. Check the schematics of the relays and try doing the same.

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I have power to the door lock switches on the drivers door but the locks do not work nor does the back hatch or the switch at the back hatch that controls all the locks in the vehicle. Do the locks g


Power Door Locks Circuit Description
The power door lock system incorporates door lock switches on both front doors and on the RH D-pillar, door lock motors in all passenger doors and in the RR cargo door, a door lock relay and a door lock control module.
Power for the door lock switches and the door lock control module is supplied from the CIG LTR fuse 13 through CKT 640 (ORN). Power for the door lock relay is supplied from the PWR ACCY circuit breaker through CKT 540 (ORN). Ground for the door lock relay is supplied from G202 through CKT 150 (BLK) and ground for the door lock control module is supplied from G400 through CKT 150 (BLK).
The door lock motors are reversible and both sides are connected to the normally closed contacts of the door lock relay. Those contacts of the relay are connected to G202. When any of the door lock switches are placed in the lock position, voltage is supplied through CKT 195 (LT BLU) to the relay lock coil. Since the other side of the lock coil is connected to ground, the coil is energized and it pulls the lock contacts closed. Voltage is then supplied through CKT 295 (GRY) to all the door lock motors and the doors lock. The unlock function operates in much the same manner except that when any of the switches are placed in the unlock position, voltage is supplied through CKT 194 (WHT) to the unlock coil of the relay and CKT 294 (TAN) supplies voltage to the apposite side of the door lock motor and the doors unlock.
Door Lock Control Module Description
The door lock control module is used on vehicles equipped with cargo doors. The purpose of the module is to lock the cargo doors after a lock cycle has been commanded from any of the door lock switches with the cargo doors open. When the RH cargo door is open, the module receives a ground signal from the closed contacts of the rear door jamb switch on CKT 1897 (ORN/BLK) to G400. When a lock command is received, the module retains this input until it receives an open input from the rear door jamb switch. Then the module sends a lock command through CKT 194 (WHT) to the door lock relay and the doors lock.
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The power door lock motor will not operate unless the rear cargo doors are fully closed. The power door lock motor is in the right cargo door. The contactors are on the rear cargo door opening on the body and on the right cargo door.

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Hi, there is only one relay for all of the windows, so that is not the problem. The likely problem is the switch. I recommend you test the switch using an ohmmeter.
In the case of the door lock, that problem may be a failed lock motor. I recommend you apply power directly to the lock motor to see if it works. If it does, check the switch. If not, replace the motor.

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Sounds like bad wiring, or bad door lock actuators. Check for power while locking/unlocking the doors.

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