Part 1
BELT TENSION SENSOR / PRESSURE SENSOR FAULTSPOSSIBLE CAUSES
- OCS wiring chafed, pierced, pinched, or broken
- OCS wiring connector terminal(s) broken, bent, pushed out, corroded, or contaminated
- Passenger bladder pressure sensor power, signal, or ground circuit open
- Passenger bladder pressure sensor power, signal, or ground circuit shorted to voltage
- Passenger bladder pressure sensor power, signal, or ground circuit shorted to ground
- Seat belt tension sensor power, signal, or ground circuit open
- Seat belt tension sensor power, signal, or ground circuit shorted to voltage
- Seat belt tension sensor power, signal, or ground circuit shorted to ground
- Belt tension sensor
- Passenger seat weight sensor
- OCM
DIAGNOSTIC TEST
1. INSPECT THE OCCUPANT CLASSIFICATION SYSTEM (OCS) WIRING AND CONNECTORS FOR CONDITIONS THAT CAUSED THE DTC(s) TO SET
Turn the ignition on.
With the scan tool, record and erase Occupant Classification Module (OCM) DTCs.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
Using the wiring diagram/schematic as a guide, inspect Occupant Classification System (OCS) wiring and connectors for chafed, pierced, pinched, and partially broken wires, and for broken, bent, pushed out, corroded, and contaminated terminals.
Q: Are any of these conditions present?
YES:
WARNING: IF THE OCCUPANT CLASSIFICATION MODULE (OCM) IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
NOTE: The Occupant Classification Module (OCM) and the Passenger Seat Bladder and Cushion Kit are the only serviceable OCS components.
If the condition is present in the OCM / OCM connector terminals / OCM wiring harness / Passenger Seat Weight Sensor, replace the OCS Bladder and Cushion Kit. If the condition is present in the Passenger Belt Tension Sensor / sensor wiring, replace the Front Passenger Seat Belt and Retractor Assembly and the Belt Tension Sensor.
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
NO: Go To 2
2. CHECK FOR ACTIVE OCM DTCs
Reconnect all disconnected OCS harness connectors.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
With the scan tool, select OCM. Wait two minutes before proceeding.
With the scan tool, read active OCM DTCs.
Q: Does the scan tool display any active Belt Tension Sensor or Pressure Sensor Related DTCs?
YES: Record the DTCs displayed by the scan tool for reference in a later step. Then, Go To 3.
No, But Other DTCs Active
Select the appropriate diagnostic procedure from Trouble Code Diagnostic Charts.
No DTCs Active
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
3. CHECK THE VOLTAGE OF THE PASSENGER BLADDER PRESSURE SENSOR POWER, SIGNAL, AND GROUND CIRCUIT
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the Passenger Seat Weight Sensor.
Disconnect the Belt Tension Sensor.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
Measure the voltage of the Passenger Bladder Pressure Sensor Power circuit. The voltage should be approximately 4.9 volts.
Measure the voltage of the Passenger Bladder Pressure Sensor Signal circuit. The voltage should be approximately 2.5 volts.
Measure the voltage of the Passenger Bladder Pressure Sensor Ground circuit. The voltage should be 0.0 volts.
Q: Is the voltage correct on all three circuits?
YES: Go To 4
NO: Go To 13
4. CHECK THE VOLTAGE BETWEEN THE PASSENGER BLADDER PRESSURE SENSOR POWER AND GROUND CIRCUIT
Measure the voltage between the Passenger Bladder Pressure Sensor Power circuit and the Passenger Bladder Pressure Sensor Ground circuit. The voltage should be approximately 4.9 volts.
Q: Is the voltage correct?
YES: Go To 5
NO: Go To 24
5. CHECK THE VOLTAGE OF THE SEAT BELT TENSION SENSOR POWER, SIGNAL, AND GROUND CIRCUIT
Measure the voltage of the Seat Belt Tension Sensor Power circuit. The voltage should be approximately 4.9 volts.
Measure the voltage of the Seat Belt Tension Sensor Signal circuit. The voltage should be approximately 2.5 volts.
Measure the voltage of the Seat Belt Tension Sensor Ground circuit. The voltage should be 0.0 volts.
Q: Is the voltage correct on all three circuits?
YES: Go To 6
NO: Go To 13
6. CHECK THE VOLTAGE BETWEEN THE SEAT BELT TENSION SENSOR POWER AND GROUND CIRCUIT
Measure the voltage between the Seat Belt Tension Sensor Power circuit and the Seat Belt Tension Sensor Ground circuit. The voltage should be approximately 4.9 volts.
Q: Is the voltage correct?
YES: Go To 7
NO: Go To 25
7. CHECK THE VOLTAGE OF THE PASSENGER BLADDER PRESSURE SENSOR POWER, SIGNAL, AND GROUND CIRCUIT WITH THE BELT TENSION SENSOR CONNECTED
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
Connect the Belt Tension Sensor.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
Measure the voltage of the Passenger Bladder Pressure Sensor Power circuit. The voltage should be approximately 4.9 volts.
Measure the voltage of the Passenger Bladder Pressure Sensor Signal circuit. The voltage should be approximately 2.5 volts.
Measure the voltage of the Passenger Bladder Pressure Sensor Ground circuit. The voltage should be 0.0 volts.
Q: Is the voltage correct on all three circuits?
YES: Go To 8
NO:
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
Replace the Front Passenger Seat Belt and Retractor Assembly and the Belt Tension Sensor.
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
8. CHECK THE VOLTAGE OF THE SEAT BELT TENSION SENSOR POWER, SIGNAL, AND GROUND CIRCUIT WITH THE PASSENGER SEAT WEIGHT SENSOR CONNECTED
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the Belt Tension Sensor.
Connect the Passenger Seat Weight Sensor.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
Measure the voltage of the Seat Belt Tension Sensor Power circuit. The voltage should be approximately 4.9 volts.
Measure the voltage of the Seat Belt Tension Sensor Signal circuit. The voltage should be approximately 2.5 volts.
Measure the voltage of the Seat Belt Tension Sensor Ground circuit. The voltage should be 0.0 volts.
Q: Is the voltage correct on all three circuits?
YES: Go To 9
NO:
WARNING:
- IF THE OCCUPANT CLASSIFICATION MODULE (OCM) IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
- TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
NOTE: The Occupant Classification Module (OCM) and the Passenger Seat Bladder and Cushion Kit are the only serviceable OCS components.
Replace the OCS Bladder and Cushion Kit.
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
9. CHECK FOR AN OPEN PASSENGER SEAT WEIGHT SENSOR
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the OCM harness connector.
Measure the resistance between the Passenger Bladder Pressure Sensor Power circuit and the Passenger Bladder Pressure Sensor Ground circuit in the OCM harness connector.
NOTE: Verify that the DVOM is connected with the positive lead to the Power circuit and the negative lead to the Ground circuit.
Q: Is the resistance approximately 3.25k ohms?
YES: Go To 10
NO:
WARNING: IF THE OCCUPANT CLASSIFICATION MODULE (OCM) IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
NOTE: The Occupant Classification Module (OCM) and the Passenger Seat Bladder and Cushion Kit are the only serviceable OCS components.
Replace the OCS Bladder and Cushion Kit.
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
10. CHECK FOR AN OPEN PASSENGER SEAT WEIGHT SENSOR
Measure the resistance between the Passenger Bladder Pressure Sensor Signal circuit and the Passenger Bladder Pressure Sensor Ground circuit in the OCM harness connector.
NOTE: Verify that the DVOM is connected with the positive lead to the Signal circuit and the negative lead to the Ground circuit.
Q: Is the resistance approximately 106k ohms?
YES: Go To 11
NO:
WARNING: IF THE OCCUPANT CLASSIFICATION MODULE (OCM) IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
NOTE: The Occupant Classification Module (OCM) and the Passenger Seat Bladder and Cushion Kit are the only serviceable OCS components.
Replace the OCS Bladder and Cushion Kit.
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
11. CHECK FOR AN OPEN SEAT BELT TENSION SENSOR
Connect the Belt Tension Sensor.
Measure the resistance between the Seat Belt Tension Sensor Power circuit and the Seat Belt Tension Sensor Ground circuit in the OCM harness connector.
NOTE: Verify that the DVOM is connected with the positive lead to the Power circuit and the negative lead to the Ground circuit.
Q: Is the resistance approximately 7.5k ohms?
YES: Go To 12
NO: Replace the Front Passenger Seat Belt and Retractor Assembly and the Belt Tension Sensor.
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
12. CHECK FOR AN OPEN SEAT BELT TENSION SENSOR
Measure the resistance between the Seat Belt Tension Sensor Signal circuit and the Seat Belt Tension Sensor Ground circuit in the OCM harness connector.
NOTE: Verify that the DVOM is connected with the positive lead to the Signal circuit and the negative lead to the Ground circuit.
Q: Is the resistance approximately 19.5m ohms?
YES: Go To 26
NO: Replace the Front Passenger Seat Belt and Retractor Assembly and the Belt Tension Sensor.
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
13. CHECK THE PASSENGER BLADDER PRESSURE SENSOR AND THE SEAT BELT TENSION SENSOR POWER, SIGNAL, AND GROUND CIRCUIT FOR A SHORT TO VOLTAGE
WARNING:
- TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING. DISCONNECT THE OCM HARNESS CONNECTOR.
- TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
Measure the voltage of the Passenger Bladder Pressure Sensor Power circuit.
Measure the voltage of the Passenger Bladder Pressure Sensor Signal circuit.
Measure the voltage of the Passenger Bladder Pressure Sensor Ground circuit.
Measure the voltage of the Seat Belt Tension Sensor Power circuit.
Measure the voltage of the Seat Belt Tension Sensor Signal circuit.
Measure the voltage of the Seat Belt Tension Sensor Ground circuit.
Q: Is there any voltage present on any of the circuits?
YES:
WARNING:
- IF THE OCCUPANT CLASSIFICATION MODULE (OCM) IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
- TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
NOTE: The Occupant Classification Module (OCM) and the Passenger Seat Bladder and Cushion Kit are the only serviceable OCS components.
Replace the OCS Bladder and Cushion Kit.
Perform SYSTEM VERIFICATION REQUIRED test. System Verification Required - OCSVR
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Airbag System Verification Test
NO: Go To 14