Airbag Light flashing
Thread Starter
|
Freshman User
Joined: Jul 2003
Posts: 48
Likes: 0
From: Florida
Airbag Light flashing
I have a 1995 Aerostar 4.0 and the airbag light is flashing a code 25 or 52. Can anyone tell me what this code means, or where I can find the codes. Thanks.
Frank
Frank
Thread Starter
|
Freshman User
Joined: Jul 2003
Posts: 48
Likes: 0
From: Florida
Airbag Light flashing
Thanks for the reply. Is this something I can fix myself or is it a dealer item to fix? Would you know where the backup power supply is located? Regards.
Frank.
Frank.
Thread Starter
|
Freshman User
Joined: Jul 2003
Posts: 48
Likes: 0
From: Florida
Airbag Light flashing
I checked out the code and it is code 52. I called Ford parts department and asked for a airbag back up power supply and they never heard of it. What would happen if I just ignor it? Or is there a way to fix it? Any help would be appreciated as this flashing light is annoying. Thanks.
Frank
Frank
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Airbag Light flashing
This is different from the pickup ADM - they have no "backup power". I suggest you find a '95 Truck & Van Ford/Helm service CD; eBay has them for ~$10 delivered.
Normal Operation
A backup power supply is contained within the air bag diagnostic monitor that consists of four capacitors and a voltage boost circuit. The voltage boost circuit charges the capacitors to 16-19 volts when the ignition switch is turned to RUN. The backup power supply is connected through a diode to Pin 15 (Circuit 611, W/O) of the air bag diagnostic monitor. The resistance of Circuit 611 to ground is infinite since it is an open circuit. This open circuit allows the capacitor to maintain its higher voltage because there is no discharge path for the capacitor. The air bag diagnostic monitor measures the voltage on the backup power supply capacitors. If the voltage on the capacitors does not reach and maintain a minimum of 16 volts after approximately 30 seconds, the air bag diagnostic monitor will flash code 52 to indicate low voltage in the backup power supply voltage boost circuit.
Possible Causes
Low backup power supply voltage can be caused by:
(1) Resistance on Circuit 611 (W/O) to ground. Resistance to ground on Circuit 611 or Circuit 612 (P/O) will cause the backup power supply capacitors to discharge and the boost circuit will not be able to boost the voltage.
(2) Boost circuit failure within the air bag diagnostic monitor. If the voltage boost circuit in the air bag diagnostic monitor is faulty it is unable to raise backup power supply voltage on the capacitor.
Normal Operation
A backup power supply is contained within the air bag diagnostic monitor that consists of four capacitors and a voltage boost circuit. The voltage boost circuit charges the capacitors to 16-19 volts when the ignition switch is turned to RUN. The backup power supply is connected through a diode to Pin 15 (Circuit 611, W/O) of the air bag diagnostic monitor. The resistance of Circuit 611 to ground is infinite since it is an open circuit. This open circuit allows the capacitor to maintain its higher voltage because there is no discharge path for the capacitor. The air bag diagnostic monitor measures the voltage on the backup power supply capacitors. If the voltage on the capacitors does not reach and maintain a minimum of 16 volts after approximately 30 seconds, the air bag diagnostic monitor will flash code 52 to indicate low voltage in the backup power supply voltage boost circuit.
Possible Causes
Low backup power supply voltage can be caused by:
(1) Resistance on Circuit 611 (W/O) to ground. Resistance to ground on Circuit 611 or Circuit 612 (P/O) will cause the backup power supply capacitors to discharge and the boost circuit will not be able to boost the voltage.
(2) Boost circuit failure within the air bag diagnostic monitor. If the voltage boost circuit in the air bag diagnostic monitor is faulty it is unable to raise backup power supply voltage on the capacitor.
Thread Starter
|
Freshman User
Joined: Jul 2003
Posts: 48
Likes: 0
From: Florida
Airbag Light flashing
Thanks for the reply. All was OK until I decided to do some 70K maintenance, like disconnecting the battery and cleaning the terminals, new thermostat, new radiator hoses, and so on, and now I get this airbag light flashing a code 52 at me. Could any of the maintenance have caused the problem? I also read that disconnecting the battery could mess up the memory and the ignition key has to be turned 256 times to clear it. If so is it safe to ignore the flashing light for 256 start up times and hope the problem will go away, or is it a major problem that could cause the airbag to deploy? Any help would be greatly appreciated. Thanks in advance.
Frank Kistner Sr.
Frank Kistner Sr.
Thread
Thread Starter
Forum
Replies
Last Post
drowand3
Explorer, Sport Trac, Mountaineer & Aviator
5
Feb 21, 2009 08:50 PM
