Drove Yukon yesterday. Today, no keyless entry, locks, power windows don't work, won't start or turn over. No electrical at all.

The keyless entry system consists of the following components:

• driver door module (DDM)
• keyless entry transmitter
• keyless entry keypad

The driver door module (DDM) receives inputs from the digital transmission range (TR) sensor, ignition switch, brake switch, window/door lock switches, lighting control module (LCM), keyless entry keypad switch and remote transmitter. The DDM outputs consists of keyless entry keypad switch illumination, power door lock actuators, luggage compartment release solenoid, horn relay, and lighting control module (LCM).

• Battery junction box (BJB) fuses:
  • circuit breaker 7 (20A)
• Central junction box (CJB)
  • 4 (10A)
  • 6 (15A)
  • 8 (25A)
  • 13 (5A)
• Keyless entry keypad switch
• Power door lock actuator
• Luggage compartment release switch
• Luggage compartment release solenoid
• Connectors or connections
• Wiring harness
• If fuse's good have checked for DTC'S - diagnostic trouble codes .
• B1526 Keyless Entry Circuit Short to Ground DDM Go To Pinpoint Test E . B1553 Decklid Release Circuit Short to Battery DDM Go To Pinpoint Test B . B1751 Park/Neutral Switch Circuit Short to Battery DDM Go To Pinpoint Test K . B2425 Remote Keyless Entry Out of Synchronization DDM Go To Pinpoint Test L Need a professional grade scan tool to check fro these codes . Not a code reader for OBD2 codes .

• The doors do not lock/unlock using the remote transmitter

• Remote transmitter not programmed.
• Remote transmitter.
• DDM.

• Go To Pinpoint Test F .

Did you program the new key fob ?

Remote Transmitter Programming NOTE: All remote transmitters are programmable and must be set at the same time.

1. Turn the key from OFF to RUN four times within three seconds, ending in RUN. The locks will then lock and unlock, confirming program mode has been entered.

1. Press any button on each remote transmitter to be programmed. The doors will lock and unlock to confirm that each remote transmitter has been programmed.

1. If additonal remote transmitters are to be programmed, repeat Step 3 within 7.5 seconds or steps 2 and 3 if more than 7.5 seconds have elapsed.

1. To exit program mode, turn the ignition to START or wait 7.5 seconds.

1. NOTE: Failure to wait at least 20 seconds will cause programming failures. Wait at least 20 seconds after turning the key to OFF or after the last remote transmitter has been programmed to activate a remote transmitter for testing or verification

Well, it is hard to say for sure without some electrical testing. It could be that you need to buy a whole bunch of door lock actuators - especially if you started losing one door lock at a time. If all of the door locks started acting up all at the same time, there is most likely high resistance in one of the door lock main power circuits - like the one that comes from the ignition switch or from the keyless entry module (if equipped).
Then on the other hand, if they LOCK OK, but do not want to UNLOCK (or visa-versa) there could be worn or burned contacts in either the lock relay or the unlock relay (or possibly even BOTH).

Again, some electrical testing should be done to pinpoint the actual cause of the problem before going out and spending a bunch of money on parts.

You may have a draw in the car. Will it jump start?
Do It Yourself Diagnosis and Repair

my remote start ont work but door locks work 2007 buick

Check the buttons.. I have an 06 Grand Prix with the Remote starter on the top and it seems that the conductor on the buttons worn out.. Take the keyfob apart, pull the rubber buttons off the chip, lick your finger and touch the place where the unlock (right side of the fob) would be. That should unlock your doors. I just did it with mine. I would just buy another fob on ebay and change the buttons out.. Hope this works

PJB box under glove box they fail and cause electrical problems u describe have scanned for codes at dealer possiable covered by warranty if is PJB box can cost a alot out of pocket

If I am not mistaken, this is a safety feature. You manually locked the doors which told the computer you could possibly be in danger and someone on the outside has your key. After you unlocked and started the vehicle it reset the mode and that is why it works now without a problem. You can test this by manually locking it again and trying the keyless entry. If it does not work, then unlock and start the vehicle and try again. If it does work have the dealer check it out as it could be the receiver for the keyless system.

Transmitter Programming Notes Transmitter Programming

1. Start with the ignition OFF, hold down the power unlock button on the door panel. Turn ignition key ON, OFF, ON, OFF. Release power unlock button on the door panel. The locks will cycle once.
2. Hold down the keyless entry transmitter LOCK and UNLOCK buttons for 15 seconds . The locks will again cycle once.
3. Repeat step #2 for each additional keyless entry transmitter.
4. Turn the ignition on to exit the keyless entry transmitter programming mode. Programming is now complete

yes it does sound like that is your problem. try checking for used one.

does the key pad light when you press a button at night? If yes, the fuse is ok.
Do you have the plastic card with the permanent code in your owner manual packet? If yes, tryit.
report back.

Keyless Entry The keyless entry keypad is hardwired to the GEM. The GEM interprets the inputs from the keyless entry keypad and then controls the associated operation. The keyless entry keypad will be illuminated for five seconds when any button is pressed. Additionally, it will request the illuminated entry feature to turn the courtesy lamps on. If a lock all doors code is entered, the illumination will turn off, as well as request the illuminated entry feature to turn off the courtesy lamps. When pressed, the keyless entry keypad supplies the ground signal to the GEM or the GEM receives a signal from the keyless entry remote transmitter. Then the GEM outputs a ground signal to the appropriate lock or unlock relay which supplies the power to the actuator to lock or unlocks all doors, including the luggage compartment. The keyless entry remote transmitter also unlocks the liftgate or activates the panic alarm by sending a signal to the GEM.
--------------------------------------------------------------- Visual Inspection Chart Mechanical Electrical

• Keyless entry keypad
• Keyless entry remote transmitter

• Central junction box (CJB) Fuse F222 (20A)
• Circuitry
• Generic electronic module (GEM)

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• No communication with generic electronic module (GEM)

• Generic electronic module.
• Circuitry.

• REFER to Section 419-10 .

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