U11A0
U11A0-00-LOST COMMUNICATION W/CENTER-PEDESTRIAN PROTECTION SATELLITE ACCELERATION SENSOR
Special Tools:
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The pedestrian protection impact sensors perform their own self test using power supplied by the Occupant Restraint Controller (ORC) then communicate this status back to the ORC module with periodic updates. The repair of this fault condition involves verifying the integrity of the wiring between the ORC module and the sensor. For ORC module Description information Occupant Restraint Controller - Description. For ORC module Operation information Occupant Restraint Controller - Operation.
- When Monitored:
The ORC module monitors communication with the Center Pedestrian Protection Acceleration sensor continuously.
- Set Condition:
This DTC sets when the ORC no longer receives notification of the status update from the center pedestrian protection satellite acceleration sensor. Once set, this DTC is latched for the entire ignition cycle. This code will set active if the loss of communication with the sensor has lasted for more then 2.5 seconds. This fault is latched for the full ignition cycle. The fault will go stored on the next key cycle upon the fault not setting for longer then 2.5 seconds.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Restraints System Pre-Diagnostic Procedure.
1.
NOTE: The use of a approved special tool or Digital Multimeter such as a Fluke Meter that will not apply more than 20 milliamperes to a circuit are the only measurement tools to be used.
NOTE: Probing of the circuit cavities at the ORC Module C1-A, C1-B, or C2-B body harness connectors is only to be done with a approved Miller Special Tools test lead from the Test Leads, Dedicated kit# 10159, test lead 10159-6. Or a comparable test lead to prevent vehicle wiring harness connector damage during diagnostic procedures. (10159)
DETERMINE ACTIVE OR STORED DTC
NOTE: Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read ORC DTCs.
Is the DTC active or stored?
ORC - ACTIVE DTC
- Go To 2
ORC - STORED DTC
- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. Restraints System Intermittent Condition Test.
2. CHECK FOR ADDITIONAL ACTIVE SATELLITE SENSOR DTCS
NOTE: The scan tool, (10159), and a DVOM are required to perform the following tests.
1. With the scan tool, read all active ORC DTCs.
Is DTC U11A0-00-LOST COMMUNICATION W/CENTER PEDESTRIAN PROTECTION SATELLITE ACCELERATION SENSOR also active?
Yes
- Go To 8
No
- Go To 3
3. CHECK (R174) CENTER PEDESTRIAN IMPACT SENSOR SIGNAL 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.
1. Disconnect the Center Pedestrian Impact Sensor harness connector.
2. Disconnect the ORC harness connectors.
NOTE: Check the connectors - Clean and repair as necessary.
3. Connect the appropriate test lead to the DVOM.
4. Measure the resistance of the (R174) Center Pedestrian Impact Sensor Signal circuit between the Center Impact Sensor harness connector and ground.
Is the resistance below 1.0 Ohm?
Yes
- Go To 4
No
- Repair or replace the (R174) Center Pedestrian Impact Sensor Signal circuit for an open. Then, Go To 4
4. CHECK (R175) CENTER PEDESTRIAN IMPACT SENSOR GROUND CIRCUIT FOR AN OPEN
NOTE: Check the connectors - Clean and repair as necessary.
1. Measure the resistance of the (R175) Left Front Impact Sensor Ground circuit between the Left Front Impact Sensor harness connector and ground.
Is the resistance below 1.0 Ohm?
Yes
- Go To 5
No
- Repair or replace the (R175) Center Pedestrian Impact Sensor ground circuit for an open.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
5. CHECK (R175) CENTER PEDESTRIAN IMPACT SENSOR GROUND CIRCUIT FOR A SHORT TO THE (R174) CENTER PEDESTRIAN IMPACT SENSOR SIGNAL CIRCUIT
NOTE: Check the connectors - Clean and repair as necessary.
1. Measure the resistance between the (R174) Center Pedestrian Impact Sensor Signal circuit and the (R175) Center Pedestrian Impact Sensor ground circuit at the Left Front Impact Sensor harness connector.
Is the resistance below 5K Ohms?
Yes
- Repair or replace the (R174) Center Pedestrian Impact Sensor Signal circuit for a short to the (R175) Center Pedestrian Impact Sensor ground circuit.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Go To 6
6. CHECK (R174) CENTER PEDESTRIAN IMPACT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance of the (R174) Center Pedestrian Impact Sensor Signal circuit between ground and the Center Pedestrian Impact Sensor harness connector.
Is the resistance below 6K Ohms?
Yes
- Repair or replace the (R174) Center Pedestrian Impact Sensor Signal circuit for a short to ground.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Go To 7
7. CHECK (R174) CENTER PEDESTRIAN IMPACT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE If equipped with the standard key ignition, use this ignition on warning.
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.
If equipped with the keyless ignition, use this ignition on warning.
WARNING: Disconnect the 12-volt battery wait two minutes before proceeding, remove the ORC fuses, connect the 12-volt battery, wait two minutes before proceeding. Cycle the ignition to the On position, then reconnect the ORC fuses. Wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Measure the voltage of the (R174) Center Pedestrian Impact Sensor Signal circuit between the Left Front Impact Sensor harness connector and ground.
Is there any voltage present?
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.
- Repair or replace the (R174) Center Pedestrian Impact Sensor Signal circuit for a short to voltage.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test. If DTC U11A0-00-LOST COMMUNICATION W/CENTER PEDESTRIAN PROTECTION SATELLITE ACCELERATION SENSOR is still active, Go To 9. Otherwise, test complete.
8. CHECK (R172) RIGHT PEDESTRIAN IMPACT SIGNAL CIRCUIT AND (R174) CENTER PEDESTRIAN IMPACT SENSOR SIGNAL CIRCUIT AND (R170) LEFT PEDESTRIAN IMPACT 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.
1. Disconnect the Center Pedestrian Impact Sensor Signal circuit harness connector.
2. Disconnect the Right Pedestrian Impact Sensor Signal circuit harness connector.
3. Disconnect the Left Pedestrian Impact Sensor Signal circuit harness connector.
4. Disconnect the ORC harness connectors.
NOTE: Check the connectors - Clean and repair as necessary.
5. Connect the appropriate test lead to the DVOM. If equipped with the standard key ignition, use this ignition on warning.
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.
If equipped with the keyless ignition, use this ignition on warning.
WARNING: Disconnect the 12-volt battery wait two minutes before proceeding, remove the ORC fuses, connect the 12-volt battery, wait two minutes before proceeding. Cycle the ignition to the On position, then reconnect the ORC fuses. Wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
6. Measure the voltage of the (R174) Center Pedestrian Impact Sensor Signal circuit between the cavity C2A - 13 and ground.
7. Measure the voltage of the (R170) Left Pedestrian Impact Sensor Signal circuit between the cavity C1B - 69 and ground.
8. Measure the voltage of the (R172) Right Pedestrian Impact Sensor Signal circuit between the cavity C1B - 68 and ground.
Is there any voltage present on either 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.
- Repair or replace the impact sensor circuit with voltage present for a short to voltage.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Go To 9
9. CHECK OPERATION OF CENTER PEDESTRIAN PROTECTION SATELLITE ACCELERATION SENSOR
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. Replace the Center Pedestrian Impact Sensor. Electronic Pedestrian Protection Impact Sensor - Removal
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. If equipped with the standard key ignition, use this ignition on warning.
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.
If equipped with the keyless ignition, use this ignition on warning.
WARNING: Disconnect the 12-volt battery wait two minutes before proceeding, remove the ORC fuses, connect the 12-volt battery, wait two minutes before proceeding. Cycle the ignition to the On position, then reconnect the ORC fuses. 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. With the scan tool, erase all codes in the ORC.
6. Perform ORC module reset. Access the Diagnostic Procedures menu from the ORC ECU Overview screen on the scan tool to perform this operation.
7. Wait one minute, and read active codes.
Did the active DTC U11AO-00-LOST COMMUNICATION W/CENTER PEDESTRIAN PROTECTION SATELLITE ACCELERATION SENSOR return?
Yes
- WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment. Failure to follow these instructions may result in possible serious or fatal injury.
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 ORC. Occupant Restraint Controller - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Repair is complete.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.