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Chuck
Chuck, ASE Certified Technician
Category: Ford
Satisfied Customers: 2100
Experience:  33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
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1998 ford explorer: air bag light..blink..sensors..thanks dom scanner

Resolved Question:

1998 ford explorer air bag light continues to blink put 2 new crash sensors clock spring and air bag module located in kick panel cant figure this one out      thanks dom scanner showes c0de b1942
Submitted: 7 years ago.
Category: Ford
Expert:  Chuck replied 7 years ago.

This is for the left hand primary crash sensor. This code sets if return circuit from the sensor is open or shorted to power.

 

Here is the description:

Pinpoint Test L: LFC 42/DTC B1942 - LH Air Bag Sensor Feed/Return Circuit Open

Normal Operation

The voltage at Pin C232-15, Circuit 619 (PK/W), is set by the air bag diagnostic monitor to be slightly less than battery voltage. Circuit 619 (PK/W) is connected to Circuit 625 (Y/LG) inside the LH air bag sensor. Therefore, the voltage at Pin C233-23, Circuit 625 (Y/LG) should be the same as the voltage at Pin C232-15, Circuit 619 (PK/W).

The air bag diagnostic monitor periodically pulls the voltage at Pin C232-15, Circuit 619 (PK/W), low to verify the connection to Pin C233-23, Circuit 625 (Y/LG). If the voltage at Pin C233-23, Circuit 625 (Y/LG), does not pull low as a result of this test, the air bag diagnostic monitor will store in memory the diagnostic trouble code (DTC) B1942 and flash a lamp fault code (LFC) 42 on the air bag indicator. If the connection between Pin C232-15, Circuit 625 (Y/LG), and Pin C233-23, Circuit 625 (Y/LG), is later repaired, the DTC B1942 will be stored in memory.

Possible Causes

Failure to get low voltage at Pin C233-23, Circuit 625 (Y/LG), during the test can be caused by:

  • an open circuit in the wiring harness in either Circuit 619 (PK/W) or Circuit 625 (Y/LG).
  • an open circuit inside the LH air bag sensor across Circuit 619 (PK/W) or Circuit 625 (Y/LG).
  • a short to battery or ignition voltage in any of the Circuits 617 (PK/O), 619 (PK/W), 624 (Y/W), or 625 (Y/LG).

 

Here is the wiring schematic of the sensor:

 

graphic

 

This is the crash sensor located at the left front of the engine compartment next ro the drivers headlamp. It also goes thru another connector C146 which is located at the left rear of the engine compartment.See top left of this pic.

graphic

 

 

Here is a list of the possible causes:

 

Possible Causes

Failure to get low voltage at Pin C233-23, Circuit 625 (Y/LG), during the test can be caused by:

  • an open circuit in the wiring harness in either Circuit 619 (PK/W) or Circuit 625 (Y/LG).
  • an open circuit inside the LH air bag sensor across Circuit 619 (PK/W) or Circuit 625 (Y/LG).
  • a short to battery or ignition voltage in any of the Circuits 617 (PK/O), 619 (PK/W), 624 (Y/W), or 625 (Y/LG).

Here is the schematic for the right sensor for circuits 617 and 624 if you need to check them for short to power also.

graphic

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