Occupant Classification Module (Ocm) - Electrical Diagnostics: Other Jeep Liberty II

Monitor Conditions

1. When Monitored: When CAN ignitions status is Run or Signal Not Available (SNA) and during the Occupant Classification Module (OCM) auto zero process or while performing the Occupant Classification Module System Verification Test.

Set Conditions

1. Set Condition: During the Occupant Classification Module System Verification Test: if the OCM detects that the sensor input is less than 1.4 volts or greater than 3.6 volts. During auto zero: if the OCM detects that the sensor input is less than 1 volt or greater than 4 volts. During auto zero: if the OCM detects that the sensor input is less than 1 volt or greater than 4 volts.

Possible Causes

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the Occupant Classification Module (OCM) checks the sensor input ranges.

1. Set Condition: If the OCM detects that the sensor input is less than 3.4 ±.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. This DTC will also set if the (R701) Seat Weight Sensor 5-volt circuit is shorted to ground. However, this condition would prevent communication with the OCM and cause a Lost Communication With OCM DTC to set in other modules. Also, this DTC will remain active after the condition that set this fault is no longer present. This condition is referred to as latching the DTC for the ignition cycle. Cycling the ignition key will change the status from active to stored if the condition that set the fault is no longer present.

Scheme 249

Scheme 250

Scheme 251

Scheme 252

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) NOTE: Make sure that the battery is fully charged. Turn the ignition on, then off, and then on again. With the scan tool, read Occupant Classification Module (OCM) DTCs. Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults? Yes Diagnose and repair the DTC. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) for a complete list of DTCs. No Go to step 2
2. VERIFY THAT DTC B1B79-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT LOW IS ACTIVE With the scan tool, read the OCM DTCs. Does the scan tool display active B1B79-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT LOW DTC? Yes Go to step 3 No Perform the OCS INTERMITTENT TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
3. VERIFY THAT B1B7A-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT HIGH DTC AND B1B79-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT LOW DTC ARE ACTIVE AT THE SAME TIME With the scan tool, read the OCM DTCs. Does the scan tool display active B1B7A-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT HIGH AND B1B79-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT LOW DTC AT THE SAME TIME? Yes Perform the B1B79-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT HIGH diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) . No Go to step 4
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Are any of these conditions present? Yes Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 5
5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY Verify that the Passenger Seat Harness is routed correctly. Is the Passenger Seat Harness routed correctly? Yes Go to step 6 No Reroute the Passenger Seat Harness as necessary. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
6. CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT Disconnect the Left-Front Seat Weight Sensor connector. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Measure the voltage of the (R701) Seat Weight Sensor 5-volt circuit. Is the voltage above 4.8 volts? Yes Go to step 7 No Go to step 9
7. CHECK (R717) LT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the OCM C2 connector. Measure the resistance of the (R717) LT-FT Seat Weight Sensor Signal circuit between ground and the OCM C2 connector. NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Is the resistance below 5.0 Ohms? Yes Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 8
8. CHECK (R717) LT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR AN OPEN Measure the resistance of the (R717) LT-FT Seat Weight Sensor Signal circuit between the OCM C2 connector and the Left-Front Seat Weight Sensor connector. NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Is the resistance below 5.0 Ohms? Yes Replace the Left-Front Seat Weight Sensor in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . If DTC B1B79-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT LOW returns active, Go to step 10 No Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
9. CHECK (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT FOR AN OPEN WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the OCM connectors. Measure the resistance of the (R701) Seat Weight Sensor 5-volt circuit between the OCM C2 connector and the Left-Front Seat Weight Sensor connector. NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Is the resistance below 5.0 Ohms? Yes WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
10. REPLACE THE OCCUPANT CLASSIFIATION MODULE WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. View repair Repair 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the Occupant Classification Module (OCM) checks the sensor input ranges.

1. Set Condition: If the OCM detects that the sensor input is greater than 96 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. Note that this DTC will remain active after the condition that set this fault is no longer present. Performing the Occupant Classification Module System Verification Test will change the status from active to stored if the condition that set the fault is no longer present.

Scheme 253

Scheme 254

Scheme 255

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) NOTE: Make sure that the battery is fully charged. Turn the ignition on, then off, and then on again. With the scan tool, read Occupant Classification Module (OCM) DTCs. Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults? Yes Diagnose and repair the DTC. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) for a complete list of DTCs. No Go to step 2
2. PREFORM OCM VERIFICATION NOTE: Failure to follow the test instructions or aborting the test causes faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion. With the scan tool in OCM, select More Options, select System Tests, and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, wait two minutes, and then proceed as follows. With the scan tool, read the OCM DTCs. Does the scan tool display active B1B7A-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT HIGH DTC? Yes Go to step 3 No Perform the OCS VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
3. VERIFY SENSOR IS TIGHTENED TO SPECIFICATION Verify that all of the Seat Weight Sensor mounting screws are tightened to specification. Refer to «Restraints - Specifications»(ref-350045-S10271288992009121400000) for specification. NOTE: Failure to follow the test instructions or aborting the test causes faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion. With the scan tool in OCM, select More Options, select System Tests, and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, wait two minutes, and then proceed as follows. With the scan tool, read the OCM DTCs. Does the scan tool display active B1B7A-PASSENGER SEAT WEIGHT SENSOR 3 - LEFT FRONT INPUT CIRCUIT HIGH DTC? Yes Go to step 4 No Perform the OCS VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Are any of these conditions present? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 5
5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY Verify that the Passenger Seat Harness is routed correctly. Is the Passenger Seat Harness routed correctly? Yes Go to step 6 No Reroute the Passenger Seat Harness as necessary. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
6. CHECK (R717) LT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the OCM C2 harness connector. Measure the voltage of the (R717) LT-FT Seat Weight Sensor Signal circuit. NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Is the voltage above 0.2 of a volt? Yes Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 7
7. CHECK (R717) LT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT Disconnect the Left-Front Seat Weight Sensor connector. Measure the resistance between the (R717) LT-FT Seat Weight Sensor Signal circuit and the (R701) Seat Weight Sensor 5-volt circuit. NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Is the resistance below 5.0 Ohms? Yes Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 8
8. CHECK (R728) SEAT WEIGHT SENSOR GROUND CIRCUIT FOR AN OPEN Measure the resistance of the (R728) Seat Weight Sensor Ground circuit between the OCM C2 connector and the Left-Front Seat Weight Sensor connector. NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Is the resistance below 5.0 Ohms? 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

Scheme 256

1. When Monitored: When CAN ignitions status is Run or SNA, during auto zero and while performing the Occupant Classification Module System Verification Test.

1. Set Condition: During the Occupant Classification Module System Verification Test: if the Occupant Classification Module (OCM) detects that the sensor input is less than 1.4 volts or greater than 3.6 volts. During auto zero: if the module detects that the sensor input is less than 1 volt or greater than 4 volts.

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the Occupant Classification module (OCM) checks the sensor input ranges.

1. Set Condition: If the OCM detects that the sensor input is less than 3.4 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. This DTC will also set if the (R701) Seat Weight Sensor 5-volt circuit is shorted to ground. However, this condition would prevent communication with the Occupant Classification Module (OCM) and cause a Lost Communication With OCM DTC to set in other modules. Also, this DTC will remain active after the condition that set this fault is no longer present. This condition is referred to as latching the DTC for the ignition cycle. Cycling the ignition key will change the status from active to stored if the condition that set the fault is no longer present.

Scheme 257

Scheme 258

Scheme 259

Scheme 260

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) NOTE: Make sure that the battery is fully charged. Turn the ignition on then off and then on again. With the scan tool, read Occupant Classification Module (OCM) DTCs. Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults? Yes Diagnose and repair the DTC. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) for a complete list of DTCs. No Go to step 2
2. VERIFY THAT DTC B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW IS ACTIVE With the scan tool, read the OCM DTCs. Does the scan tool display active B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW DTC? Yes Go to step 3 No Perform the OCS INTERMITTENT TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
3. VERIFY THAT DTC B1B7F-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT HIGH AND B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW ARE BOTH ACTIVE With the scan tool, read the OCM DTCs. Does the scan tool display active B1B7F-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT HIGH DTC? Yes Perform the B1B7F-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT HIGH diagnostic test. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) . No Go to step 4
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chaffed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Are any of these conditions present? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 5
5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY Verify that the Passenger Seat Harness is routed correctly. Is the Passenger Seat Harness routed correctly? Yes Go to step 6 No Reroute the Passenger Seat Harness as necessary. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
6. CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT Disconnect the Right-Front Seat Weight Sensor connector. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Measure the voltage of the (R701) Seat Weight Sensor 5-volt circuit. Is the voltage above 4.8 volts? Yes Go to step 7 No Go to step 9
7. CHECK (R718) RT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the OCM C2 connector. Measure the resistance of the (R718) RT-FT Seat Weight Sensor Signal circuit between the OCM C2 connector cavity 5 and ground. Is the resistance below 5.0 Ohms? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 8
8. CHECK (R718) RT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR AN OPEN Measure the resistance of the (R718) RT-FT Seat Weight Sensor Signal circuit between the OCM C2 connector cavity 5 and the Right-Front Seat Weight Sensor connector cavity 2. Is the resistance below 5.0 Ohms? Yes Replace the Right-Front Seat Weight Sensor in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . If DTC B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW returns active, Go to step 10 No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
9. CHECK (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT FOR AN OPEN WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the OCM C2 connector. Measure the resistance of the (R701) Seat Weight Sensor 5-volt circuit between the OCM C2 connector cavity 1 and the Right-Front Seat Weight Sensor connector cavity 3. Is the resistance below 5.0 Ohms? 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
10. REPLACE THE OCCUPANT CLASSIFIATION MODULE WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. View repair 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the module checks the sensor input ranges.

1. Set Condition: If the module detects that the sensor input is greater than 96 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. Note that this DTC will remain active after the condition that set this fault is no longer present. Performing the Occupant Classification Module System Verification Test will change the status from active to stored if the condition that set the fault is no longer present.

Scheme 261

Scheme 262

Scheme 263

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) NOTE: Make sure that the battery is fully charged. Turn the ignition on, then off, and then on again. With the scan tool, read Occupant Classification Module (OCM) DTC. Does the scan tool display any active DTC relating to internal faults, ignition faults, or battery faults? Yes Diagnose and repair the DTC. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) for a complete list of DTCs. No Go to step 2
2. VERIFY OCM NOTE: Failure to follow the test instructions or aborting the test causes faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion. With the scan tool in OCM, select More Options, select System Tests, and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, wait two minutes, and then proceed as follows. With the scan tool, read the OCM DTC. Does the scan tool display active B1B7F-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT HIGH DTC? Yes Go to step 3 No Perform the OCS VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
3. VERIFY SENSOR IS TIGHTENED TO SPECIFICATION Verify that all of the Seat Weight Sensor mounting screws are tightened to specification. Refer to «Restraints - Specifications»(ref-350045-S10271288992009121400000) . NOTE: Failure to follow the test instructions or aborting the test causes faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion. With the scan tool in OCM, select More Options, select System Tests and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, wait two minutes and then proceed as follows. With the scan tool, read the OCM DTC. Does the scan tool display active B1B7F-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT HIGH DTC? Yes Go to step 4 No Perform the OCS VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Are any of these conditions present? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 5
5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY Verify that the Passenger Seat Harness is routed correctly. Is the Passenger Seat Harness routed correctly? Yes Go to step 6 No Reroute the Passenger Seat Harness as necessary. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
6. CHECK (R718) RT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the OCM C2 connector. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury. Measure the voltage of the (R718) RT-FT Seat Weight Sensor Signal circuit. Is the voltage above 0.2 of a volt? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 7
7. CHECK (R718) RT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the Right-Front Seat Weight Sensor connector. Measure the resistance between the (R718) RT-FT Seat Weight Sensor Signal circuit and the (R701) Seat Weight Sensor 5-volt circuit. Is the resistance below 5.0 Ohms? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 8
8. CHECK (R728) SEAT WEIGHT SENSOR GROUND CIRCUIT FOR AN OPEN Measure the resistance of the (R728) Seat Weight Sensor Ground circuit between the OCM C2 connector and the Right-Front Seat Weight Sensor connector. Is the resistance below 5.0 Ohms? 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

Scheme 264

1. When Monitored: When CAN ignitions status is Run or SNA, during auto zero and while performing the Occupant Classification Module System Verification Test.

1. Set Condition: During the Occupant Classification Module System Verification Test: if the Occupant Classification Module (OCM) detects that the sensor input is less than 1.4 volts or greater than 3.6 volts. During auto zero: if the OCM detects that the sensor input is less than 1 volt or greater than 4 volts.

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the Occupant Classification Module (OCM) checks the sensor input ranges.

1. Set Condition: If the OCM detects that the sensor input is less than 3.4 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. This DTC will also set if the (R701) Seat Weight Sensor 5-volt circuit is shorted to ground. However, this condition would prevent communication with the Occupant Classification Module (OCM) and cause a Lost Communication With OCM DTC to set in other modules. Also, this DTC will remain active after the condition that set this fault is no longer present. This condition is referred to as latching the DTC for the ignition cycle. Cycling the ignition key will change the status from active to stored if the condition that set the fault is no longer present.

Scheme 265

Scheme 266

Scheme 267

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) NOTE: Make sure that the battery is fully charged. Turn the ignition on, then off and then on again. With the scan tool, read OCM DTCs. Does the scan tool display any active DTCs relating to internal faults, ignition faults or battery faults? Yes Diagnose and repair the DTC. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) for a complete list of DTCs. No Go to step 2
2. VERIFY THAT DTC B1B83-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT LOW IS ACTIVE With the scan tool, read the OCM DTCs. Does the scan tool display active B1B83-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT LOW DTC? Yes Go to step 3 No Perform the OCS INTERMITTENT TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
3. VERIFY THAT B1B83-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT LOW DTC AND B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH DTC ARE ACTIVE AT THE SAME TIME With the scan tool, read the OCM DTCs. Does the scan tool display active: B1B83-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT LOW AND B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH AT THE SAME TIME? Yes Perform the B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) . No Go to step 4
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched or partially broken wires and broken, bent, pushed out, spread, corroded or contaminated terminals. Are any of these conditions present? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) No Go to step 5
5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY Verify that the Passenger Seat Harness is routed correctly. Is the Passenger Seat Harness routed correctly? Yes Go to step 6 No Reroute the Passenger Seat Harness as necessary. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
6. CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT Disconnect the Left-Rear Seat Weight Sensor connector. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Measure the voltage of the (R701) Seat Weight Sensor 5-volt circuit. Is the voltage above 4.8 volts? Yes Go to step 7 No Go to step 9
7. CHECK (R705) LT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the OCM C2 harness connector. Measure the resistance of the (R705) LT-RR Seat Weight Sensor Signal circuit between ground and the OCM C2 connector. Is the resistance below 5.0 Ohms? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 8
8. CHECK (R705) LT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR AN OPEN Measure the resistance of the (R705) LT-RR Seat Weight Sensor Signal circuit between the OCM C2 connector and the Left-Rear Seat Weight Sensor connector. Is the resistance below 5.0 Ohms? Yes Replace the Left-Rear Seat Weight Sensor in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harnessing accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
9. CHECK (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT FOR AN OPEN Disconnect the OCM C2 connector. Measure the resistance of the (R701) Seat Weight Sensor 5-volt circuit between the OCM C2 connector and the Left-Rear Seat Weight Sensor connector. Is the resistance below 5.0 Ohms? Yes WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the Occupant Classification Module (OCM) checks the sensor input ranges.

1. Set Condition: If the OCM detects that the sensor input is greater than 96 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. Note that this Diagnostic Trouble Code (DTC) will remain active after the condition that set this fault is no longer present. Performing the Occupant Classification Module System Verification Test will change the status from active to stored if the condition that set the fault is no longer present.

Scheme 268

Scheme 269

Scheme 270

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) NOTE: Make sure that the battery is fully charged. Turn the ignition on, then off and then on again. With the scan tool, read OCM DTC. Does the scan tool display any active DTC relating to internal faults, ignition faults or battery faults? Yes Diagnose and repair the DTC. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) for a complete list of DTCs. No Go to step 2
2. VERIFY THAT DTC B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH IS ACTIVE NOTE: Failure to follow the test instructions or aborting the test causes faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion. With the scan tool in OCM, select More Options, System Tests and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test completes, wait two minutes and then proceed as follows. With the scan tool, read the OCM DTC. Does the scan tool display active B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH DTC? Yes Go to step 3 No Perform the OCS VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
3. VERIFY THAT DTC B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH IS ACTIVE Verify that all of the Seat Weight Sensor mounting screws are tightened to specification. Refer to «Restraints - Standard Procedure»(ref-350045-S08941161262009121400000) . NOTE: Failure to follow the test instructions or aborting the test causes faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion. With the scan tool in OCM, select More Options, select System Tests and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test completes, wait two minutes and then proceed as follows. With the scan tool, read the OCM DTC. Does the scan tool display active B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH DTC? Yes Go to step 4 No Perform the OCS VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched or partially broken wires and broken, bent, pushed out, spread, corroded or contaminated terminals. Are any of these conditions present? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 5
5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY Verify that the Passenger Seat Harness is routed correctly. Is the Passenger Seat Harness routed correctly? Yes Go to step 6 No Reroute the Passenger Seat Harness as necessary. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
6. CHECK (R705) LT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the OCM C2 harness connector. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury. Measure the voltage of the (R705) LT-RR Seat Weight Sensor Signal circuit. Is the voltage above 0.2 of a volt? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 7
7. CHECK (R705) LT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the Left-Rear Seat Weight Sensor connector. Measure the resistance between the (R705) LT-RR Seat Weight Sensor Signal circuit and the (R701) Seat Weight Sensor 5-volt circuit. Is the resistance below 5.0 Ohms? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 8
8. CHECK (R728) SEAT WEIGHT SENSOR GROUND CIRCUIT FOR AN OPEN Measure the resistance of the (R728) Seat Weight Sensor Ground circuit between the OCM C2 connector and the Left-Rear Seat Weight Sensor connector. Is the resistance below 5.0 Ohms? Yes WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

Scheme 271

1. When Monitored: When CAN ignitions status is Run or SNA, during auto zero and while performing the Occupant Classification Module System Verification Test.

1. Set Condition: During the Occupant Classification Module System Verification Test: if the Occupant Classification Module (OCM) detects that the sensor input is less than 1.4 volts or greater than 3.6 volts. During auto zero: if the OCM detects that the sensor input is less than 1 volt or greater than 4 volts.

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the Occupant Classification Module (OCM) checks the sensor input ranges.

1. Set Condition: If the OCM detects that the sensor input is less than 3.4 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. This DTC will also set if the (R701) Seat Weight Sensor 5-volt circuit is shorted to ground. However, this condition would prevent communication with the Occupant Classification Module (OCM) and cause a Lost Communication With OCM DTC to set in other modules. Also, this DTC will remain active after the condition that set this fault is no longer present. This condition is referred to as latching the DTC for the ignition cycle. Cycling the ignition key will change the status from active to stored if the condition that set the fault is no longer present.

Scheme 272

Scheme 273

Scheme 274

Scheme 275

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) NOTE: Make sure that the battery is fully charged. Turn the ignition on, then off, and then on again. With the scan tool, read Occupant Classification Module (OCM) DTCs. Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults? Yes Diagnose and repair the DTC. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) for a complete list of DTCs. No Go to step 2
2. VERIFY THAT DTC B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW IS ACTIVE With the scan tool, read OCM DTCs. Does the scan tool display active: B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW? Yes Go to step 3 No Perform the OCS INTERMITTENT TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
3. VERIFY THAT DTC B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW AND B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH ARE ACTIVE AT THE SAME TIME With the scan tool, read OCM DTCs. Does the scan tool display active: B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW DTC AND B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH DTC AT THE SAME TIME? Yes Perform B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH diagnostic test. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) . No Go to step 4
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Are any of these conditions present? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 5
5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY Verify that the Passenger Seat Harness is routed correctly. Is the Passenger Seat Harness routed correctly? Yes Go to step 6 No Reroute the Passenger Seat Harness as necessary. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
6. CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT Disconnect the Right-Rear Seat Weight Sensor connector. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Measure the voltage of the (R701) Seat Weight Sensor 5-volt circuit. Is the voltage above 4.8 volts? Yes Go to step 7 No Go to step 9
7. CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the OCM C2 connector. Measure the resistance of the (R706) RT-RR Seat Weight Sensor Signal circuit between ground and the OCM C2 connector. Is the resistance below 5.0 Ohms? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 8
8. CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR AN OPEN Measure the resistance of the (R706) RT-RR Seat Weight Sensor Signal circuit between the OCM C2 connector and the Right-Rear Seat Weight Sensor connector. Is the resistance below 5.0 Ohms? Yes Replace the Right-Rear Seat Weight Sensor in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . If the B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW returns active, Go to step 10 No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
9. CHECK (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT FOR AN OPEN Disconnect the OCM C2 connector. Measure the resistance of the (R701) Seat Weight Sensor 5-volt circuit between the OCM C2 connector and the Right-Rear Seat Weight Sensor connector. Is the resistance below 5.0 Ohms? 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
10. REPLACE THE OCCUPANT CLASSIFIATION MODULE WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. View repair 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the Occupant Classification Module (OCM) checks the sensor input ranges.

1. Set Condition: If the OCM detects that the sensor input is greater than 96 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. Note that this DTC will remain active after the condition that set this fault is no longer present. Performing the Occupant Classification Module System Verification Test will change the status from active to stored if the condition that set the fault is no longer present.

Scheme 276

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) NOTE: Make sure that the battery is fully charged. Turn the ignition on, then off and then on again. With the scan tool, read the Occupant Classification Module (OCM) DTCs. Does the scan tool display any active DTCs relating to internal faults, ignition faults or battery faults? Yes Diagnose and repair the DTC. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing»(ref-350097-S15140359092009121400000) for a complete list of DTCs. No Go to step 2
2. PERFORM THE OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST NOTE: Make sure that the battery is fully charged. NOTE: The Occupant Classification Seat Weights 9077 are required to perform this test. Remove any special tools or jumper wires and reconnect all previously disconnected components - except the battery. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. NOTE: Failure to follow the test instructions or aborting the test will cause faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion. With the scan tool in OCM, select More Options, select System Tests and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, wait two minutes and then proceed as follows. With the scan tool, read the OCM DTCs. Does the scan tool display any active PASSENGER SEAT WEIGHT SENSOR DTCs? Yes Go to step 3 No Perform the OCS VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
3. VERIFY THAT DTC B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH IS ACTIVE WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Verify that all of the Seat Weight Sensor mounting screws are tightened to specification. Refer to «Restraints - Specifications»(ref-350045-S10271288992009121400000) . WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury. NOTE: Failure to follow the test instructions or aborting the test will cause faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion. With the scan tool in OCM, select More Options, select System Tests and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, wait two minutes and then proceed as follows. With the scan tool, read steamy DTCs. Does the scan tool display active B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH DTC? Yes Go to step 4 No Perform the OCS VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chaffed, pierced, pinched or partially broken wires and broken, bent, pushed out, spread, corroded or contaminated terminals. Are any of these conditions present? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 5
5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY Verify that the Passenger Seat Harness is routed correctly. Is the Passenger Seat Harness routed correctly? Yes Go to step 6 No Reroute the Passenger Seat Harness as necessary. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
6. CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the OCM C2 connectors. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury. Measure the voltage of the (R706) RT-RR Seat Weight Sensor Signal circuit. Is the voltage above 0.2 of a volt? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 7
7. CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the Right-Rear Seat Weight Sensor connector. Measure the resistance between the (R706) RT-RR Seat Weight Sensor Signal circuit and the (R701) Seat Weight Sensor 5-volt circuit. Is the resistance below 5.0 Ohms? Yes NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Go to step 8
8. CHECK (R728) SEAT WEIGHT SENSOR GROUND CIRCUIT FOR AN OPEN Measure the resistance of the (R728) Seat Weight Sensor Ground circuit between the OCM C2 connector and the Right-Rear Seat Weight Sensor connector. Is the resistance below 5.0 Ohms? 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness. Replace the Passenger Seat Harness in accordance with the Service Information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

1. When Monitored: With the ignition on.

1. Set Condition: Because other DTC have made occupant detection impossible. This DTC will set in addition to all sensor and module DTC and will be erased when the repairs are completed.

1. When Monitored: With the CAN ignition status as IGN_RUN, the Occupant Classification Module (OCM) tries to detect potentially damaging events and monitors the CAN Bus for the Impact messages (crash event causing one or more airbag or pretensioner to deploy) or upon detecting an Offset Event (if equipped).

1. Set Condition: This DTC will set if the OCM detects a potentially damaging event or the impact messages from the CAN Bus input.

1. When Monitored: While the CAN bus ignition status is IGN_RUN or signal not available.

1. Set Condition: This DTC will set if the Occupant Classification Module (OCM) has initiated a re-zero and did not successfully complete the system verification, a system verification routine has been aborted or a update option table from the flash routine has been completed.

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the module checks the sensor supply.

1. Set Condition: If the Occupant Classification Module (OCM) detects that the sensor supply shorted. NOTE: A shorted supply circuit will cause a 'NO RESPONSE FROM OCM" condition.

1. When Monitored: While the CAN bus ignition status is in IGN_RUN.

1. Set Condition: If the Occupant Classification Module (OCM) detects any two sensors voltages below 20 mV for ten minutes while any other sensor is greater than 40 mV. ( Note: 1 A/D count is equal to 5 mV.) NOTE: A shorted supply circuit will cause a "NO RESPONSE FROM OCM" condition.

1. When Monitored: While the CAN bus ignition status is in IGN_RUN, the Occupant Classification module (OCM) checks the sensor input ranges.

1. Set Condition: If the OCM detects a seat weight sensor input with the total seat weight below -6.5 kg (+/- 1 kg)

1. When Monitored: If the Configuration Table is not programmed at the supplier or when the checksum is invalid.

1. Set Condition: This DTC will set if the Occupant Classification Module (OCM) was received unprogrammed from the supplier, the vehicle line was not identified correctly or if the flash procedure was not completed successfully

1. When Monitored: With the ignition on, the Occupant Classification Module (OCM) monitors the position of each Seat Weight Sensor. The sensor identification is mapped to the sensor position during the module re-zero procedure or OCM SYSTEM VERIFICATION TEST.

1. Set Condition: This DTC will set if the OCM detects one or more new Seat Weight Sensors or if the existing sensors are moved to a new position.

1. When Monitored: With the ignition on, the Occupant Classification Module (OCM) monitors the position of each Seat Weight Sensor. The sensor identification is mapped to the sensor position during the module re-zero process.

1. Set Condition: This DTC will set if the OCM detects one or more new Seat Weight Sensors or if the existing sensors are moved to a new position.

1. When Monitored: With the ignition on, the Occupant Classification Module (OCM) monitors the position of each Seat Weight Sensor. The sensor identification is mapped to the sensor position during the re-zero process or OCM SYSTEM VERIFICATION TEST.

1. Set Condition: This DTC will set if the OCM detects one or more new Seat Weight Sensors or if the existing sensors are moved to a new position.

1. When Monitored: With the ignition on, the Occupant Classification Module (OCM) monitors the position of each Seat Weight Sensor. The sensor identification is mapped to the sensor position during the re-zero procedure orOCM SYSTEM VERIFICATION TEST.

1. Set Condition: This DTC will set if the module detects one or more new Seat Weight Sensors or if the existing sensors are moved to a new position.

1. When Monitored: While the Occupant Classification Module (OCM) CAN bus ignition status received is RUN or signal not available, the module checks the (A27) Fused B(+) circuit voltage input range.

1. Set Condition: If the OCM detects that the battery voltage is less than or equal to 6.25 volts ± 0.25 volt.

Scheme 277

1. VERIFY THAT DTC B210D-BATTERY VOLTAGE LOW IS ACTIVE NOTE: Make sure the battery is fully charged. NOTE: Troubleshoot any PCM/ECM charging/cranking DTCs before proceeding. Turn the ignition on. With the scan tool, read the Occupant Classification Module (OCM) DTCs. Does the scan tool display active B210D-BATTERY VOLTAGE LOW IS ACTIVE DTC? Yes Go to step 2 No Perform the OCS INTERMITTENT TEST. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .
2. VERIFY (A27) FUSED B(+) CIRCUIT WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. Disconnect the OCM connectors. WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury. Measure the voltage between the (A27) Fused B(+) circuit OCM C1 connector cavity 1 and ground. Is the voltage above 6.5 volts circuit? Yes WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. 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 may result in possible serious or fatal injury. Replace the OCM in accordance with the service information. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) . No Repair the (A27) Fused B(+) circuit for an open or high resistance. Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure»(ref-350097-S07453899422009121400000) .

1. When Monitored: While the CAN bus ignition status received is RUN or SNA (Signal Not Available), the Occupant Classification Module (OCM) checks the (A27) Fused B(+) circuit voltage input range.

1. Set Condition: If the OCM detects battery voltage greater than or equal to 24.25 ± 0.25 volts for 10 seconds.

1. When Monitored: During power-up, the Occupant Classification Module (OCM) monitors the CAN bus for the VIN message.

1. Set Condition: This DTC will set if the VIN information received from the Powertrain Control Module (PCM) or Engine Control Module (ECM) is different from the stored VIN.

1. When Monitored: While the IGN status is in the RUN position or the signal is not available, while the CAN bus system voltage is between 10 and 16 volts and during the module re-zero process or the Occupant Classification Module System Verification Test.

1. Set Condition: This DTC will set if the Occupant Classification Module (OCM) detects an internal failure.

1. When Monitored: Continuously when the ignition is on. Battery Voltage between 10 and 16 Volts. Ignition Off Draw (IOD) fuse installed. Totally Integrated Power Module (TIPM) is configured correctly.

1. Set Condition: The Occupant Classification Module (OCM) detects a corrupt CAN C Bus messages from the Totally Integrated Power Module (TIPM).

1. When Monitored: With the ignition on. Battery voltage between 10 and 16 volts. Ignition Off Draw (IOD) fused installed. Totally Integrated Power Module (TIPM) is configured correctly.

1. Set Condition: The Occupant Restraint Controller (ORC) doesn't receive a TIPM message over the CAN C BUS circuit for approximately two to five seconds.

1. When Monitored: Continuously when the ignition is on. Battery Voltage between 10 and 16 Volts. Ignition Off Draw (IOD) fuse installed. Totally Integrated Power Module (TIPM) is configured correctly.

1. Set Condition: The Occupant Classification Module (OCM) doesn't receive a Occupant Restraint Controller (ORC) message over the CAN C BUS circuit for approximately two to five seconds.

1. When Monitored: At ignition on the Occupant Classification Module (OCM) supplies 5 volts to power up the Left Front Passenger Seat Weight Sensor. Every time the sensor is powered up it sends an initialization message containing the sensor serial number to the OCM.

1. Set Condition: If the Left Front Passenger Seat Weight Sensor 5 volt supply is temporarily interrupted resulting in the sensor powering up more than one time in the same ignition cycle the code will be set.

1. When Monitored: At ignition on the Occupant Classification Module (OCM) supplies 5 volts to power up the Right Front Passenger Seat Weight Sensor. Every time the sensor is powered up it sends an initialization message containing the sensor serial number to the OCM.

1. Set Condition: If the Right Front Passenger Seat Weight Sensor 5 volt supply is temporarily interrupted resulting in the sensor powering up more than one time in the same ignition cycle the code will be set.

1. When Monitored: At ignition on the Occupant Classification Module (OCM) supplies 5 volts to power up the Left Rear Passenger Seat Weight Sensor. Every time the sensor is powered up it sends an initialization message containing the sensor serial number to the OCM.

1. Set Condition: If the Left Rear Passenger Seat Weight Sensor 5 volt supply is temporarily interrupted resulting in the sensor powering up more than one time in the same ignition cycle the code will be set.

1. When Monitored: At ignition on the Occupant Classification Module (OCM) supplies 5 volts to power up the Right Rear Passenger Seat Weight Sensor. Every time the sensor is powered up it sends an initialization message containing the sensor serial number to the OCM.

1. Set Condition: If the Right Rear Passenger Seat Weight Sensor 5 volt supply is temporarily interrupted resulting in the sensor powering up more than one time in the same ignition cycle the code will be set.