Fault Code 14 Front Impact Sensor Circuit Shorted to Ground

FAULT CODE 14
Front Impact Sensor Circuit Shorted to Ground

Normal Operation
The Air Bag Diagnostic Module (DM) monitors voltage level at pins 2 and 6. If this voltage falls to 5 volts, or less, the MIL Lamp will illuminate and fault code 14 will be present, indicating a short-circuit ground on either off the two front impact sensor circuits. During the presence of fault code 14 the DM internal thermal fuse will blow, disabling the airbag deployment circuit. If voltage to pins 2 and 6 is restored after the fuse has blown, fault code 51, open internal fuse will be present. Fault code 14 will be present only as long as the short to ground remains.

Possible Causes
Short to ground in any of the following circuits:
- Front impact sensor wiring.
- Disconnection, or poor connection of harness.
- Front impact sensors internal ground.

Fault Diagnosis
1. Sub-circuit identification
- Disarm Airbag/SRS system.
- Remove plastic locking wedge from the grey DM connector.
- Measure resistance between connector pin 3 and all of the following pins; 2, 6, 17 and 18.
- Does any resistance reading indicate short circuit?

Yes - Renew faulty sensor.
No - Examine sensor wiring harness, locate and repair faults as necessary.

Proceed to fault code 51 on successful diagnosis.

Electrical Schematic-Front Impact Sensor Circuit Shorted To Ground, Fig.1:

1. Instrument Panel Fuse
2. Engine Compartment Fuse
3. Safing Sensor
4. Cable Reel Cassettes
5. Driver-side Airbag
6. Passenger-side Airbag
7. RH Impact Sensor
8. LH Impact Sensor
9. Airbag MIL Lamp
10. Diagnostic Module