Electra Park Avenue V6-231 3.8L VIN 3 FI (1988)
Door Locks: Customer Interest
Locks - Activated When Ignition is Turned OFF
Bulletin
89-10-16A
Date
June, '89
Ref. No.
89-078A-10
Corp. Ref. No.
901601R
SUBJECT:
AUTOMATIC DOOR LOCKS (OPTION AU4) ACTIVATED TO LOCK POSITION WHEN IGNITION IS TURNED OFF
MODELS AFFECTED:
1985-89 ELECTRA/PARK AVENUES
This bulletin has been revised to clarify Parts Kit usage and to let dealers know the Zener Diode is included in Kit No. 25535774. Bulletin replaces
89-10-16 (901601R).
The above condition can occur on any 1985 thru 1989 Electra and Park Avenue vehicles. It is most likely to occur on vehicles with Nippondenso fuel
pumps.
The fuel pump armature spins after the ignition is turned off. The armature then acts as a generator that can transmit a transient electrical pulse into the
automatic door lock (ADL) circuit causing the doors to lock.
DEALER ACTION
To prevent the electrical pulse from entering the ADL circuit, a zener diode can be added. The diode blocks the pulse.
NOTICE:
Be certain to install the zener diode in the proper direction. Follow the instructions carefully. Improper installation will not correct the condition. Obtain
Diode Kit, Part Number 25535774 from GMSPO.
1.
Disconnect battery negative cable.
2.
Open glove box (1) fully pull rubber retainers (2).
