B1B70
B1B70 UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 171
Theory of Operation
The impact sensors perform their own self test using power supplied by the Occupant Restraint Controller (ORC) then communicate this status back
to the ORC with periodic updates. The repair of this fault condition involves verifying the integrity of the wiring between the ORC and the sensor.
- When Monitored:
The Occupant Restraint Controller (ORC) continuously communicates with the Front Left Impact Sensor over the sensor signal circuit. The
sensor communication and on board diagnostics are powered by the ORC signal.
- Set Condition:
This code will set, if the ORC and the Front Left Impact Sensor do not establish and maintain valid data communications.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 172
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. VERIFY THAT DTC B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL IS ACTIVE
NOTE: Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read ORC DTCs.
Does the scan tool display active: B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL?
Yes
- Go To 2
No
- Perform the RESTRAINT SYSTEM INTERMITTENT TEST. . See: Restraints and Safety Systems/Testing and Inspection/Initial Inspection
and Diagnostic Overview/Restraints System Intermittent Condition Test
2. CHECK THE (R79), (R81) FRONT LEFT IMPACT SENSOR SIGNAL AND GROUND CIRCUITS FOR A SHORT TO BATTERY
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 Front Left Impact Sensor connector.
2. Disconnect the ORC connector.
3. Connect the SRS Load Tool Adaptor 8443-24 to the Occupant Restraint Controller C2 connector.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 173
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.
4. Measure the voltage of the (R79) Front Left Impact Sensor Signal circuit and (R81) Sensor Ground circuit at the Front Left Impact Sensor
connector and ground.
Is there any voltage present?
Yes
- Repair the (R79), (R81) Front Left Impact Sensor circuits for a short to battery.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 3
3. CHECK THE (R79) FRONT LEFT IMPACT 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.
1. Measure the resistance of the (R79) Front Left Impact Sensor Signal circuit between the Front Left Impact Sensor connector and ground.
Is the resistance below 100K Ohms?
Yes
- Repair the (R79) Front Left Impact Sensor Signal circuit for a short to ground.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 4
4. CHECK THE (R79), (R81) FRONT LEFT IMPACT SENSOR CIRCUITS FOR A SHORT TOGETHER
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 174
1. Measure the resistance between the (R79) Front Left Impact Sensor Signal and (R81) Sensor Ground circuits at the Front Left Impact Sensor
connector.
Is the resistance below 100K Ohms?
Yes
- Repair the (R79), (R81) Front Left Impact Sensor circuits shorted together.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 5
5. CHECK THE (R81) FRONT LEFT IMPACT SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (R81) Front Left Impact Sensor Ground circuit between the Front Left Impact Sensor connector and the Load
Tool ORC Adaptor 8443A.
Is the resistance below 1 Ohm?
Yes
- Go To 6
No
- Repair the (R81) Front Left Impact Sensor 1 Ground circuit for an open or high resistance.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
6. CHECK THE (R79) FRONT LEFT IMPACT SENSOR CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 175
1. Measure the resistance of the (R79) Front Left Impact Sensor Ground circuit between the Front Left Impact Sensor connector and the 8443A
Load Tool ORC Adaptor.
Is the resistance below 1 Ohm?
Yes
- Go To 7
No
- Repair the (R79) Front Left Impact Sensor Signal circuit for an open or high resistance.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
7. CHECK OPERATION OF THE FRONT LEFT IMPACT SENSOR
1. Replace the Front Left Impact Sensor.
2. Reconnect the vehicle body harness to the impact sensor.
3. 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 and wait two minutes before proceeding. Failure to follow these
instructions may result in possible serious or fatal injury.
4. Connect the scan tool to the Data Link Connector - use the most current software available.
5. Use the scan tool and erase the stored codes in all airbag system modules.
6. Turn the Ignition Off, and wait 15 seconds before turning the Ignition On.
7. Wait one minute, and read active codes and if there are none present read the stored codes.
Did the active Front Left Impact Sensor DTC return?
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 Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to follow these
instructions may result in possible serious or fatal injury.
- Replace the Occupant Restraint Controller.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Repair is complete.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
B1B70 UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 171
Theory of Operation
The impact sensors perform their own self test using power supplied by the Occupant Restraint Controller (ORC) then communicate this status back
to the ORC with periodic updates. The repair of this fault condition involves verifying the integrity of the wiring between the ORC and the sensor.
- When Monitored:
The Occupant Restraint Controller (ORC) continuously communicates with the Front Left Impact Sensor over the sensor signal circuit. The
sensor communication and on board diagnostics are powered by the ORC signal.
- Set Condition:
This code will set, if the ORC and the Front Left Impact Sensor do not establish and maintain valid data communications.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 172
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. VERIFY THAT DTC B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL IS ACTIVE
NOTE: Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read ORC DTCs.
Does the scan tool display active: B1B70-UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL?
Yes
- Go To 2
No
- Perform the RESTRAINT SYSTEM INTERMITTENT TEST. . See: Restraints and Safety Systems/Testing and Inspection/Initial Inspection
and Diagnostic Overview/Restraints System Intermittent Condition Test
2. CHECK THE (R79), (R81) FRONT LEFT IMPACT SENSOR SIGNAL AND GROUND CIRCUITS FOR A SHORT TO BATTERY
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 Front Left Impact Sensor connector.
2. Disconnect the ORC connector.
3. Connect the SRS Load Tool Adaptor 8443-24 to the Occupant Restraint Controller C2 connector.
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 173
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.
4. Measure the voltage of the (R79) Front Left Impact Sensor Signal circuit and (R81) Sensor Ground circuit at the Front Left Impact Sensor
connector and ground.
Is there any voltage present?
Yes
- Repair the (R79), (R81) Front Left Impact Sensor circuits for a short to battery.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 3
3. CHECK THE (R79) FRONT LEFT IMPACT 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.
1. Measure the resistance of the (R79) Front Left Impact Sensor Signal circuit between the Front Left Impact Sensor connector and ground.
Is the resistance below 100K Ohms?
Yes
- Repair the (R79) Front Left Impact Sensor Signal circuit for a short to ground.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 4
4. CHECK THE (R79), (R81) FRONT LEFT IMPACT SENSOR CIRCUITS FOR A SHORT TOGETHER
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 174
1. Measure the resistance between the (R79) Front Left Impact Sensor Signal and (R81) Sensor Ground circuits at the Front Left Impact Sensor
connector.
Is the resistance below 100K Ohms?
Yes
- Repair the (R79), (R81) Front Left Impact Sensor circuits shorted together.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Go To 5
5. CHECK THE (R81) FRONT LEFT IMPACT SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (R81) Front Left Impact Sensor Ground circuit between the Front Left Impact Sensor connector and the Load
Tool ORC Adaptor 8443A.
Is the resistance below 1 Ohm?
Yes
- Go To 6
No
- Repair the (R81) Front Left Impact Sensor 1 Ground circuit for an open or high resistance.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
6. CHECK THE (R79) FRONT LEFT IMPACT SENSOR CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 175
1. Measure the resistance of the (R79) Front Left Impact Sensor Ground circuit between the Front Left Impact Sensor connector and the 8443A
Load Tool ORC Adaptor.
Is the resistance below 1 Ohm?
Yes
- Go To 7
No
- Repair the (R79) Front Left Impact Sensor Signal circuit for an open or high resistance.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
7. CHECK OPERATION OF THE FRONT LEFT IMPACT SENSOR
1. Replace the Front Left Impact Sensor.
2. Reconnect the vehicle body harness to the impact sensor.
3. 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 and wait two minutes before proceeding. Failure to follow these
instructions may result in possible serious or fatal injury.
4. Connect the scan tool to the Data Link Connector - use the most current software available.
5. Use the scan tool and erase the stored codes in all airbag system modules.
6. Turn the Ignition Off, and wait 15 seconds before turning the Ignition On.
7. Wait one minute, and read active codes and if there are none present read the stored codes.
Did the active Front Left Impact Sensor DTC return?
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 Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to follow these
instructions may result in possible serious or fatal injury.
- Replace the Occupant Restraint Controller.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
No
- Repair is complete.
- Perform the ORC VERIFICATION TEST. See: Verification Tests/Occupant Restraint Controller (ORC) Verification Test.
