RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
7. Close the drive side from door. Check that both the passenger and driver side outboard front seat belt retractors are latched by slowly pulling the
seat belt webbing out of the retractor. If only one retractor is latched, the unlatched retractor and circuit must be diagnosed. See Seat Belt Retractor
latch Solenoid in the Diagnosis and Testing. If both retractors are unlatched, see Seat Belt Control Timer Module in the Diagnosis and Testing.
8. Repeat steps # 6 and # 7, but open and close the passenger side front door instead of the driver side.
9. Turn the ignition switch to the Off position. This will cause the seat belt control system to exit its test mode and return to normal operation.
10. Turn the ignition switch back to the On position. The seat belt reminder and airbag indicator lamps should turn OFF shortly after their normal
display functions (about six and seven seconds, respectively). If either lamp remains lighted, use a DRB scan tool and the proper Diagnostic
Procedures to diagnose the SCTM fault circuit to the ACM, the airbag system, the ACM, and the CCD data bus.
11. If the seat belt control system test mode has timed out prior to completion of the tests (about five minutes after the test was initiated), go back to
step # 2.
The SCTM is programmed to consider certain parameters as an indication of a faulty Gravity (G)-sensor. In some peculiar vehicle use situations these
parameters may be exceeded, causing the seat belt reminder lamp to illuminate indicating an SCTM fault, and them extinguish for no apparent reason.
The following parameters should be considered if an intermittent seat belt reminder lamp illumination complaint is being diagnosed, and the test mode
reveals no problems with the structural seat belt control system operation.
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If the SCTM monitors ten ignition cycles without input from the G-sensor indicating that the vehicle has accelerated or decelerated sufficiently to
require the seat belts to be latched. An ignition cycle is defined as: The ignition switch turned to the On position for at least thirty minutes,
followed by the ignition switch being turned to the Off position. The SCTM considers this a G-sensor fault because it would normally be expected
that the seat belts would require latching at some point while driving, within ten ignition cycles. The SCTM will discontinue the fault signal and
reset the ignition cycle counter to zero as soon as it sees a "normal" G-sensor input.
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If the SCTM monitors that the G-sensor input has required the seat belts to remain latched for more than about four seconds. The SCTM will
discontinue the fault signal as soon as it sees a "normal" G-sensor input.
Airbag Diagnostic Trouble Codes
The Airbag Control Module may report any of the following diagnostic trouble codes.
Airbag diagnostic trouble codes consist of active and stored codes. If more than one code exists, diagnostic priority should be give to the active codes.
Active diagnostic trouble codes for the airbag system are not permanent and will change the moment the reasoning for the code is corrected. In certain
test procedures, diagnostic trouble codes are used as a diagnostic tool.
For these codes, replace the Airbag Control Module (ACM) even if set intermittently.
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ACM ACCELEROMETER......FIRING CAPACITOR LOW
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AECM OUTPUT DRIVER CIRCUIT OPEN......LOGIC CAPACITOR LOW
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AECM INTERNAL DIAGNOSTIC CODE # 1......SAFING SENSOR SHORTED
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WARNING LAMP DRIVER ERROR
For these codes, refer to the appropriate diagnostic procedure:
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Cluster Message Mismatch
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Driver Squib Circuit Open
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Driver Squib Circuit Shorted
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Driver Squib Circuit Shorted to Battery
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Driver Squib Circuit Shorted to Ground
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Loss of Ignition Run Only
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Loss of Ignition Run/Start
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No Cluster CCD Message
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Missing or Invalid VIN
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Passenger Squib Circuit Open
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Passenger Squib Circuit Shorted
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Passenger Squib Circuit Shorted to Battery
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Passenger Squib Circuit Shorted to Ground
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SCTM Failure
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SCTM Message Mismatch
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VIN Mismatch
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Warning Lamp Bulb or Driver
Active Codes
The code becomes active as soon as the malfunction is detected or key-OFF, whichever occurs first. An active trouble code indicates an on-going
malfunction. This means that the defect is currently there every time the airbag control module checks that circuit/function. It is impossible to erase an
