B1B90
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 205
B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER
Theory of Operation
When powered, the Occupant Restraint Controller (ORC) sends a test current to the seat track position sensors to verify the integrity of the sensor
and wiring. The use of the SRS Load Tool Adapter Tool in the tests below provides a test point in place of the module.
- When Monitored:
While the CAN bus ignition status is in IGN_RUN and the module is configured for a Seat Track Position Sensor, the module checks the
sensor input current ranges.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 206
- Set Condition:
If the module detects that the sensor input is greater than or equal to 17.1 mA.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See: Restraints and Safety Systems/Testing and
Inspection/Initial Inspection and Diagnostic Overview/Restraints System Pre-Diagnostic Procedure.
1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT RESTRAINT
CONTROLLER (ORC)
1. With the scan tool, read Occupant Restraint Controller (ORC) DTCs.
Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults?
Yes
- Diagnose and repair the DTCs. See: .
No
- Go To 2
2. VERIFY THAT DTC B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER IS ACTIVE
Does the scan tool display active: B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER?
Yes
- Go To 3
No
- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. . See: Restraints and Safety Systems/Testing and Inspection/Initial
Inspection and Diagnostic Overview/Restraints System Intermittent Condition Test
3. INSPECT DRIVER 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.
1. Using the wiring diagram/schematic as a guide, inspect the Driver 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 any of these conditions exist
- Replace the Driver Seat Harness.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 4
4. VERIFY THAT DRIVER SEAT HARNESS IS ROUTED CORRECTLY
1. Verify that the Driver Seat Harness is routed correctly.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 207
Is the Driver Seat Harness routed correctly?
Yes
- Go To 5
No
- Reroute the Driver Seat Harness as necessary.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
5. CHECK FOR DTC B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER WITH DRIVER SEAT
TRACK POSITION SENSOR DISCONNECTED
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.
1. Disconnect the Driver Seat Track Position Sensor connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these
instructions may result in possible serious or fatal injury.
2. Wait two minutes, and then with the scan tool, read ORC DTCs.
Does the scan tool display: B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER?
Yes
- Go To 6
No
- 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 Driver Seat Track Position Sensor.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
6. CHECK (Z261) SEAT POSITION SENSOR GROUND CIRCUIT AND (R263) SEAT POSITION SENSOR VOLTAGE-DRIVER
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.
1. Disconnect the ORC C1 connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these
instructions may result in possible serious or fatal injury.
2. Measure the voltage of the (Z261) Driver Seat Position Sensor Ground circuit between the Driver Seat Track Position Sensor connector and
ground.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 208
3. Measure the voltage of the (R263) Driver Seat Position Sensor Voltage circuit between the Driver Seat Track Position Sensor connector and
ground.
Is the voltage above 0.2 of a volt on either circuit?
Yes
- NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if any of these conditions exist
- 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 Driver Seat Harness.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 7
7. CHECK (Z261) DRIVER SEAT POSITION SENSOR GROUND CIRCUIT FOR A SHORT TO (R263) DRIVER SEAT POSITION
SENSOR VOLTAGE 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.
1. Measure the resistance between the (Z261) Driver Seat Position Sensor Ground circuit and the (R263) Driver Seat Position Sensor Voltage
circuit in the Driver Seat Track Position Sensor connector.
Is the resistance below 10K Ohms?
Yes
- NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if any of these conditions exist
- Replace the Driver Seat Harness.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Replace the ORC.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 205
B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER
Theory of Operation
When powered, the Occupant Restraint Controller (ORC) sends a test current to the seat track position sensors to verify the integrity of the sensor
and wiring. The use of the SRS Load Tool Adapter Tool in the tests below provides a test point in place of the module.
- When Monitored:
While the CAN bus ignition status is in IGN_RUN and the module is configured for a Seat Track Position Sensor, the module checks the
sensor input current ranges.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 206
- Set Condition:
If the module detects that the sensor input is greater than or equal to 17.1 mA.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See: Restraints and Safety Systems/Testing and
Inspection/Initial Inspection and Diagnostic Overview/Restraints System Pre-Diagnostic Procedure.
1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT RESTRAINT
CONTROLLER (ORC)
1. With the scan tool, read Occupant Restraint Controller (ORC) DTCs.
Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults?
Yes
- Diagnose and repair the DTCs. See: .
No
- Go To 2
2. VERIFY THAT DTC B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER IS ACTIVE
Does the scan tool display active: B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER?
Yes
- Go To 3
No
- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. . See: Restraints and Safety Systems/Testing and Inspection/Initial
Inspection and Diagnostic Overview/Restraints System Intermittent Condition Test
3. INSPECT DRIVER 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.
1. Using the wiring diagram/schematic as a guide, inspect the Driver 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 any of these conditions exist
- Replace the Driver Seat Harness.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 4
4. VERIFY THAT DRIVER SEAT HARNESS IS ROUTED CORRECTLY
1. Verify that the Driver Seat Harness is routed correctly.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 207
Is the Driver Seat Harness routed correctly?
Yes
- Go To 5
No
- Reroute the Driver Seat Harness as necessary.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
5. CHECK FOR DTC B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER WITH DRIVER SEAT
TRACK POSITION SENSOR DISCONNECTED
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.
1. Disconnect the Driver Seat Track Position Sensor connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these
instructions may result in possible serious or fatal injury.
2. Wait two minutes, and then with the scan tool, read ORC DTCs.
Does the scan tool display: B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER?
Yes
- Go To 6
No
- 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 Driver Seat Track Position Sensor.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
6. CHECK (Z261) SEAT POSITION SENSOR GROUND CIRCUIT AND (R263) SEAT POSITION SENSOR VOLTAGE-DRIVER
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.
1. Disconnect the ORC C1 connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these
instructions may result in possible serious or fatal injury.
2. Measure the voltage of the (Z261) Driver Seat Position Sensor Ground circuit between the Driver Seat Track Position Sensor connector and
ground.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 208
3. Measure the voltage of the (R263) Driver Seat Position Sensor Voltage circuit between the Driver Seat Track Position Sensor connector and
ground.
Is the voltage above 0.2 of a volt on either circuit?
Yes
- NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if any of these conditions exist
- 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 Driver Seat Harness.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 7
7. CHECK (Z261) DRIVER SEAT POSITION SENSOR GROUND CIRCUIT FOR A SHORT TO (R263) DRIVER SEAT POSITION
SENSOR VOLTAGE 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.
1. Measure the resistance between the (Z261) Driver Seat Position Sensor Ground circuit and the (R263) Driver Seat Position Sensor Voltage
circuit in the Driver Seat Track Position Sensor connector.
Is the resistance below 10K Ohms?
Yes
- NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if any of these conditions exist
- Replace the Driver Seat Harness.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Replace the ORC.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
