Airbag warning code 52
#1
01-26-2005, 01:59 AM
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Airbag warning code 52
I have searched this and other forums for some posts about this code and have not found much help. Seems it means (Code 52) "Backup Power Supply-Voltage Boost Fault. Does this mean "Fuse problem?" Computer problem? Anyone had this one come up. Happened after jump starting truck.
Kirk
Kirk
#2
01-27-2005, 10:53 PM
Back up power is actually a large value capactor that can supply enough power to trip the system in accident that causes loss of regular battery power.
Try removing the neg battery cable for about 3 minutes and reconnct and see is the trouble code clears.
Note that doing this 'may' have a temporary effect on how the engine runs because you are clearing the engine computer of learned operating conditions.
Usually there is no fuse involved with this but I have no info past 2001 and that might have changed by now.
Try removing the neg battery cable for about 3 minutes and reconnct and see is the trouble code clears.
Note that doing this 'may' have a temporary effect on how the engine runs because you are clearing the engine computer of learned operating conditions.
Usually there is no fuse involved with this but I have no info past 2001 and that might have changed by now.
#3
01-28-2005, 07:37 AM
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Check Fuse F2 in the underhood fusebox. If it is blown, you must follow the procedures in the service documentation rather than just replacing the fuse.
Pinpoint Test A: LFC 12/52/DTC B1867 — Lost or Low Battery Voltage
Normal Operation
The air bag diagnostic monitor (14B056) measures the voltage at pin C209-14, circuit 937 (R/W), of the air bag diagnostic monitor connector. Voltage at pin C209-14, circuit 937 (R/W) should be equal to battery voltage. If the voltage at pin C209-14, circuit 937 (R/W), drops to less than 8 volts, the air bag diagnostic monitor will flash a lamp fault code (LFC) 12 on the air bag indicator. If the voltage at pin C209-14, circuit 937 (R/W), drops to less than 5 volts, the diagnostic trouble code (DTC) B1867 will also be stored in memory. Should the loss of battery voltage at pin C209-14, circuit 937 (R/W), be intermittent or repaired, the air bag diagnostic monitor will flash a LFC 52 (or higher priority code if one exists) on the next ignition switch cycle.
Possible Causes
WARNING:
DO NOT UNDER ANY CIRCUMSTANCES SUBSTITUTE ANOTHER FUSE VALUE FOR THE 10A BATTERY FUSE 2. ANY FUSE OTHER THAN 10A MAY CAUSE DISARMING FAILURE AND MAY RESULT IN DANGER TO THE OCCUPANTS OF THE VEHICLE. DO NOT ATTEMPT TO REPLACE THE 10A FUSE 2 UNLESS THE AIR BAG SYSTEM FIRST HAS BEEN DEACTIVATED. (REFER TO THE DEACTIVATION PROCEDURE IN THIS SECTION).
Note:
If a short to ground exists on any of circuits 607 (LB/O), 614 (GY/O), 615 (GY/W), or 616 (PK/BK), 1112 (W/LB), 1113 (Y/LG), leading to a LFC 13 or 53 and DTC B1913 or similarly a short to ground exists on any of circuits 617 (PK/O), 619 (PK/W), 624 (Y/W) or 625 (Y/LG) leading to a LFC 14 or 54 and DTC B1914 the air bag diagnostic monitor will activate an internal solid state switch at pin C209-13 of the air bag diagnostic monitor. This causes the battery fuse 2 (10A) to blow, thus disarming the air bag system and preventing inadvertent air bag deployment. If the power distribution box battery fuse 2 has blown, it must be replaced by a 10A fuse.
Low voltage at air bag diagnostic monitor pin C209-14,in C209-14, circuit 937 (R/W), drops to less than 5 volts, the diagnostic trouble code (DTC) B1867 will also be stored in memory. Should the loss of battery voltage at pin C209-14, circuit 937 (R/W), be intermittent or repaired, the air bag diagnostic monitor will flash a LFC 52 (or higher priority code if one exists) on the next ignition switch cycle.
Possible Causes
WARNING:
DO NOT UNDER ANY CIRCUMSTANCES SUBSTITUTE ANOTHER FUSE VALUE FOR THE 10A BATTERY FUSE 2. ANY FUSE OTHER THAN 10A MAY CAUSE DISARMING FAILURE AND MAY RESULT IN DANGER TO THE OCCUPANTS OF THE VEHICLE. DO NOT ATTEMPT TO REPLACE THE 10A FUSE 2 UNLESS THE AIR BAG SYSTEM FIRST HAS BEEN DEACTIVATED. (REFER TO THE DEACTIVATION PROCEDURE IN THIS SECTION).
Note:
If a short to ground exists on any of circuits 607 (LB/O), 614 (GY/O), 615 (GY/W), or 616 (PK/BK), 1112 (W/LB), 1113 (Y/LG), leading to a LFC 13 or 53 and DTC B1913 or similarly a short to ground exists on any of circuits 617 (PK/O), 619 (PK/W), 624 (Y/W) or 625 (Y/LG) leading to a LFC 14 or 54 and DTC B1914 the air bag diagnostic monitor will activate an internal solid state switch at pin C209-13 of the air bag diagnostic monitor. This causes the battery fuse 2 (10A) to blow, thus disarming the air bag system and preventing inadvertent air bag deployment. If the power distribution box battery fuse 2 has blown, it must be replaced by a 10A fuse.
Low voltage at air bag diagnostic monitor pin C209-14, circuit 937 (R/W), can be caused by:
l An open in the battery circuit that would prevent battery positive voltage (B+) from reaching the air bag diagnostic monitor pin C209-14, circuit 937 (R/W).
l A short to ground on the battery feed circuit between the fuse 2 (10A) and pin C209-13, circuit 937 (R/W), or pin C209-14, circuit 937 (R/W), of the air bag diagnostic monitor.
l A concern in the charging system causing battery voltage to drop below 8 volts.
After the air bag diagnostic monitor has disarmed the air bag system, it will not be enabled until the appropriate condition (DTC B1913 or B1914) has been repaired and cleared by performing the appropriate pinpoint tests.
Pinpoint Test A: LFC 12/52/DTC B1867 — Lost or Low Battery Voltage
Normal Operation
The air bag diagnostic monitor (14B056) measures the voltage at pin C209-14, circuit 937 (R/W), of the air bag diagnostic monitor connector. Voltage at pin C209-14, circuit 937 (R/W) should be equal to battery voltage. If the voltage at pin C209-14, circuit 937 (R/W), drops to less than 8 volts, the air bag diagnostic monitor will flash a lamp fault code (LFC) 12 on the air bag indicator. If the voltage at pin C209-14, circuit 937 (R/W), drops to less than 5 volts, the diagnostic trouble code (DTC) B1867 will also be stored in memory. Should the loss of battery voltage at pin C209-14, circuit 937 (R/W), be intermittent or repaired, the air bag diagnostic monitor will flash a LFC 52 (or higher priority code if one exists) on the next ignition switch cycle.
Possible Causes
WARNING:
DO NOT UNDER ANY CIRCUMSTANCES SUBSTITUTE ANOTHER FUSE VALUE FOR THE 10A BATTERY FUSE 2. ANY FUSE OTHER THAN 10A MAY CAUSE DISARMING FAILURE AND MAY RESULT IN DANGER TO THE OCCUPANTS OF THE VEHICLE. DO NOT ATTEMPT TO REPLACE THE 10A FUSE 2 UNLESS THE AIR BAG SYSTEM FIRST HAS BEEN DEACTIVATED. (REFER TO THE DEACTIVATION PROCEDURE IN THIS SECTION).
Note:
If a short to ground exists on any of circuits 607 (LB/O), 614 (GY/O), 615 (GY/W), or 616 (PK/BK), 1112 (W/LB), 1113 (Y/LG), leading to a LFC 13 or 53 and DTC B1913 or similarly a short to ground exists on any of circuits 617 (PK/O), 619 (PK/W), 624 (Y/W) or 625 (Y/LG) leading to a LFC 14 or 54 and DTC B1914 the air bag diagnostic monitor will activate an internal solid state switch at pin C209-13 of the air bag diagnostic monitor. This causes the battery fuse 2 (10A) to blow, thus disarming the air bag system and preventing inadvertent air bag deployment. If the power distribution box battery fuse 2 has blown, it must be replaced by a 10A fuse.
Low voltage at air bag diagnostic monitor pin C209-14,in C209-14, circuit 937 (R/W), drops to less than 5 volts, the diagnostic trouble code (DTC) B1867 will also be stored in memory. Should the loss of battery voltage at pin C209-14, circuit 937 (R/W), be intermittent or repaired, the air bag diagnostic monitor will flash a LFC 52 (or higher priority code if one exists) on the next ignition switch cycle.
Possible Causes
WARNING:
DO NOT UNDER ANY CIRCUMSTANCES SUBSTITUTE ANOTHER FUSE VALUE FOR THE 10A BATTERY FUSE 2. ANY FUSE OTHER THAN 10A MAY CAUSE DISARMING FAILURE AND MAY RESULT IN DANGER TO THE OCCUPANTS OF THE VEHICLE. DO NOT ATTEMPT TO REPLACE THE 10A FUSE 2 UNLESS THE AIR BAG SYSTEM FIRST HAS BEEN DEACTIVATED. (REFER TO THE DEACTIVATION PROCEDURE IN THIS SECTION).
Note:
If a short to ground exists on any of circuits 607 (LB/O), 614 (GY/O), 615 (GY/W), or 616 (PK/BK), 1112 (W/LB), 1113 (Y/LG), leading to a LFC 13 or 53 and DTC B1913 or similarly a short to ground exists on any of circuits 617 (PK/O), 619 (PK/W), 624 (Y/W) or 625 (Y/LG) leading to a LFC 14 or 54 and DTC B1914 the air bag diagnostic monitor will activate an internal solid state switch at pin C209-13 of the air bag diagnostic monitor. This causes the battery fuse 2 (10A) to blow, thus disarming the air bag system and preventing inadvertent air bag deployment. If the power distribution box battery fuse 2 has blown, it must be replaced by a 10A fuse.
Low voltage at air bag diagnostic monitor pin C209-14, circuit 937 (R/W), can be caused by:
l An open in the battery circuit that would prevent battery positive voltage (B+) from reaching the air bag diagnostic monitor pin C209-14, circuit 937 (R/W).
l A short to ground on the battery feed circuit between the fuse 2 (10A) and pin C209-13, circuit 937 (R/W), or pin C209-14, circuit 937 (R/W), of the air bag diagnostic monitor.
l A concern in the charging system causing battery voltage to drop below 8 volts.
After the air bag diagnostic monitor has disarmed the air bag system, it will not be enabled until the appropriate condition (DTC B1913 or B1914) has been repaired and cleared by performing the appropriate pinpoint tests.
#4
02-22-2005, 10:48 PM
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I also have the Airbag Fault 52. I found that my heater/blower stayed on with the ignition switch turned off. I replaced the ignition switch as I found it defective, it kept the heater/blower circuit stuck in the on position. This was causing my battery to drain to below 8 volts and I believe is the cause of my airbag code 52.
Now that I have fixed the low voltage boost problem causing the airbag diagnostic to flash code 52, does anyone know how to clear the code?
I read that you can short pin 4 to ground somewhere but I have no idea where this airbag check connector is located on my Expedition. Any help is very much appreciated.
Now that I have fixed the low voltage boost problem causing the airbag diagnostic to flash code 52, does anyone know how to clear the code?
I read that you can short pin 4 to ground somewhere but I have no idea where this airbag check connector is located on my Expedition. Any help is very much appreciated.