Question about 2005 Chevrolet Trailblazer Ext

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Back doors autolock then will not unlock with the unlock button

The back doors will auto lock when driving but will not unlock with the unlock button even though it sounds like it is trying to do so. Changed the unlock relay with a new component but no change.

Have to unlock them manually....royal pain.

Front doors work fine

2005 Trailblazer EXT

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  • yadayada
    yadayada May 11, 2010

    is the child safety feature turned on?

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No, the child safety locks are unlocked.

Posted on May 03, 2010

  • kkunkel May 03, 2010

    No, the child safety locks are unlocked.




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Back doors have a safety switch on the door. If it is what I think it is, open each back door from the outside and then flip the switch. Car washes are usually the culprit for this happening. As the car is being dried, they trip the switch and don't realize it.

Good luck.

Posted on May 08, 2009

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1999 Lincoln town car doors will no longer automatically lock when the gear shifter is engaged. What would cause this?


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You must complete steps 1 through 7 within 30 seconds or the procedure
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You must complete steps 1 through 7 within 30 seconds or the procedure
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1. Turn the ignition key to ON.
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Auto Lock Activation


Deactivating/activating autolock
There are 3 methods to enable/disable this feature. One through your
dealer, the second with a power door unlock/lock sequence and the third
with the keypad.
Before following the activation or deactivation procedures, make sure
that the anti-theft system is not armed, ignition is off, and all vehicle
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Controls and features
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procedure
You must complete steps 1-5 within
30 seconds or the procedure will
have to be repeated. If the
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you must wait 30 seconds.
1. Turn the ignition key to ON.
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4. Press the power door unlock control three times.
5. Turn the ignition back to ON. The horn will chirp.
6. Press the unlock control, then press the lock control. The horn will
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1. Enter 5 digit entry code
2. Press and hold 7/8 control
3. Press and release 3/4 control
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chirp
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using the interior trim switch. If these conditions are met, the entire
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Controls and features
127

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CLICK HERE for the owners manual you require.

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