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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 03-07-2011, 09:50 PM
Nitesaber Nitesaber is offline
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Air bag code 34...

Any idea on what can cause this. I think it is for the driver side but anyone had this and fixed it or know precisiley the cause?
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Old 03-08-2011, 08:53 AM
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PINPOINT TEST 34: DRIVER SIDE AIR BAG CIRCUIT LOW RESISTANCE OR SHORTED (CODE 34)


Normal Operation

The air bag diagnostic monitor measures the resistance across Pin 10, Circuit 615 (GY/W) and Pin 11, Circuit 614 (GY/O) every time the key is turned to RUN. Normal resistance across these circuits is between 1.5 and 2.0 ohms. This resistance comes from the driver side air bag module (approximately 1.0 ohm) and the windings of the air bag sliding contact (0.25 to 0.5 ohm per winding, two windings in all). If the resistance across these two circuits is less than 0.7 ohm, the air bag diagnostic monitor will flash Code 34 on the air bag lamp.

l The connectors for the driver side air bag module and the air bag sliding contact have metal spring clips that act as shorting bars. These shorting bars are built into the plastic hardshell connectors. The shorting bars are designed to short Circuits 614 and 615 together when the connectors are not mated. Do not attempt to remove the air bag shorting bar and measure the resistance of the air bag. The air bag sliding contact shorting bar may be removed to measure the resistance of the air bag sliding contact. Use extreme care when reinstalling the shorting bar to make sure it is installed correctly.

Possible Causes

Low resistance across Pins 10 and 11 can be caused by:

(1) A poorly mated connector on the air bag sliding contact may not push the shorting bars back into their fully retracted positions.

(2) A faulty shorting bar may short Circuits 614 and 615 together.

(3) A short in the air bag sliding contact windings between Circuits 614 and 615.

(4) A short across the terminals within the driver side air bag module. DO NOT attempt a direct resistance measurement of the driver side air bag module. Follow the diagnostic procedures to determine if the driver side air bag module resistance is lower than normal.

34-1 CHECK FOR DTC 34


l Key to RUN.

l Count diagnostic trouble code (if any).

l Is Code 34 flashing?

Yes
GO to «34-2».

No
READ the normal operation description for this code. EXAMINE the code schematic and LOOK for areas where intermittent problems would occur (connectors, splices, crimps, etc.). DO NOT PROCEED with pinpoint test until the code is flashing! Failure to do so will result in needless replacement of the air bag diagnostic monitor and repeat service.
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Old 03-08-2011, 10:00 AM
Nitesaber Nitesaber is offline
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Wow, thank you very much, Everything i needed. Now i do have 2 different connectors underneath my dash where the wires cross over into the engine bay. a white one to the left and to the right a black one. Which box has the wires i am looking for so i can trace them back and look for crimps, splices, etc?
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Old 03-08-2011, 11:05 AM
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The Airbag Module is located behind the dash. That is the interface to the Airbag in the steering column. According to the info I gave you in Post #2 the issue lies in the path between the Airbag and the Airbag module.
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Old 03-08-2011, 04:35 PM
Nitesaber Nitesaber is offline
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What is the easiest way to get to the module? take dash completely off, or just disassemble the steering column?
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Old 03-08-2011, 09:36 PM
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This drawing from subford might help
Click the image to open in full size.

Look at location F3 for the airbag module. You might be able to get to it from under the dash. My '92 F350 is not blessed with airbags, neither were my two previous '93 Lightnings
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Old 03-08-2011, 10:38 PM
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I have never messed with air bag systems, any suggestions before i take a look? anything i can do to prevent detonation? Unplug negative on battery im assuming, anything else? and any tips would be great, i can follow all of what you said so far, just had to look up what some of the parts did and where they are at on the module and what not.
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Old 03-09-2011, 08:33 AM
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As you stated, remove a battery terminal then wait 30 minutes before attempting any work on the airbag circuits. Good luck
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Old 11-24-2013, 05:23 AM
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My truck has recently acquired this issue. It only occurs when the truck has been parked for some time and if it is extremely humid or raining. After driving the truck, it won't happen again that day. Has anyone seen this before? I know this is an older thread, but figure its all relevant to the same issue.
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Old 11-24-2013, 05:23 AM
 
 
 
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