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Home >> Lincoln >> 2009 >> Town Car V8-4.6L >> Repair and Diagnosis >> Restraints and Safety Systems >> Air Bag Systems >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test N: DTC B2296 >> N16-N30

N16-N30




N16 CHECK CIRCUITS 1264 (BN) AND 1263 (WH) FOR A SHORT TO VOLTAGE BETWEEN THE PASSENGER SIDE IMPACT SENSOR AND RCM


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Side Impact Sensor C304.
- Disconnect: RCM C310a and C310b.
- Repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Ignition ON.
- Measure the voltage between passenger side impact sensor:
- C304-2, circuit 1264 (BN), harness side and ground.
- C304-1, circuit 1263 (WH), harness side and ground.




- Is voltage present on either circuit?

Yes
REPAIR circuit 1264 (BN) or 1263 (WH). GO to N44.

No
GO to N21.

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N17 CHECK CIRCUITS 1264 (BN) AND 1263 (WH) FOR A SHORT TO GROUND BETWEEN THE PASSENGER SIDE IMPACT SENSOR AND RCM


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Side Impact Sensor C304.
- Disconnect: RCM C310a and C310b.
- Measure the resistance between passenger side impact sensor:
- C304-2, circuit 1264 (BN), harness side and ground.
- C304-1, circuit 1263 (WH), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to N21.

No
REPAIR circuit 1264 (BN) or 1263 (WH). GO to N44.

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N18 CHECK CIRCUIT 1264 (BN) FOR AN OPEN BETWEEN THE RCM AND PASSENGER SIDE IMPACT SENSOR


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Side Impact Sensor C304.
- Disconnect: RCM C310a and C310b.
- Measure the resistance between RCM C310b-30, circuit 1264 (BN), harness side and passenger side impact sensor C304-2, circuit 1264 (BN), harness side.




- Is the resistance less than 0.5 ohm?

Yes
GO to N19.

No
REPAIR circuit 1264 (BN). GO to N44.

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N19 CHECK CIRCUIT 1263 (WH) FOR AN OPEN BETWEEN THE RCM AND PASSENGER SIDE IMPACT SENSOR


- Measure the resistance between RCM C310b-29, circuit 1263 (WH), harness side and passenger side impact sensor C304-1, circuit 1263 (WH), harness side.




- Is the resistance less than 0.5 ohm?

Yes
GO to N20.

No
REPAIR circuit 1263 (WH). GO to N44.

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N20 CHECK FOR A SHORT BETWEEN CIRCUITS 1264 (BN) AND 1263 (WH) BETWEEN THE RCM AND PASSENGER SIDE IMPACT SENSOR


- Measure the resistance between passenger side impact sensor C304-2, circuit 1264 (BN), harness side and C304-1, circuit 1263 (WH), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to N21.

No
REPAIR short between circuits 1264 (BN) and 1263 (WH). GO to N44.

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N21 CHECK THE PASSENGER SIDE IMPACT SENSOR


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Connect: RCM C310a and C310b.
- Install a known good passenger side impact sensor. Refer to Side Impact Sensor Side Impact Sensor.
- Repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Enter the following diagnostic mode on the scan tool: Self-Test - RCM.
- Enter the following diagnostic mode on the scan tool: DataLogger - RCM - View and Record All B2296 Fault PIDs.
- Refer to PID list in Normal Operation to view B2296 fault PIDs.
- Were any on-demand fault PIDs the for passenger side impact sensor indicating a fault?

Yes
GO to N42.

No
Fault corrected. GO to N44.

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N22 INSPECT THE LH FRONT IMPACT SEVERITY SENSOR MOUNTING AND MOUNTING SURFACE


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Access the LH front impact severity sensor. Refer to Front Impact Severity Sensor Front Impact Severity Sensor.
- Inspect the LH front impact severity sensor for:
- a loose electrical connector.
- a loose sensor mounting nut.
- Remove the LH front impact severity sensor. Refer to Front Impact Severity Sensor Front Impact Severity Sensor.
- Visually inspect the LH front impact severity sensor, alignment tabs, electrical connector and mounting surface for damage, corrosion or dirt.
- Was a significant amount of corrosion or dirt found, was the LH front severity impact sensor attached to the mounting surface incorrectly or were the sensor bolts not fully seated and tightened correctly?

Yes
CLEAN and TIGHTEN bolts to the required specification or REPAIR the mounting surface as necessary. REINSTALL the LH front impact severity sensor. GO to N44.

No
GO to N23.

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N23 INSTALL THE LH FRONT IMPACT SEVERITY SENSOR AND CARRY OUT THE SELF-TEST


- Clean and repair the mounting surface as necessary.
- Clean the LH front impact severity sensor mounting bolts.
- Install the LH front impact severity sensor. Refer to Front Impact Severity Sensor Front Impact Severity Sensor.
- Repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Enter the following diagnostic mode on the scan tool: Self-Test - RCM.
- Enter the following diagnostic mode on the scan tool: DataLogger - RCM - View and Record All B2296 Fault PIDs.
- Refer to PID list in Normal Operation to view B2296 fault PIDs.
- Do any on-demand B2296 fault PIDs indicate a fault?

Yes
GO to N24.

No
Fault corrected. GO to N44.

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N24 CHECK THE LH FRONT IMPACT SEVERITY SENSOR GROUND CIRCUIT 618 (VT/LG) FOR HIGH RESISTANCE


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: LH Front Impact Severity Sensor C1465.
- Measure the resistance between the LH front impact severity sensor C1465-2, circuit 618 (VT/LG), harness side and driver front impact severity sensor case ground.
- Is the resistance less than 100 ohms?

Yes
GO to N31.

No
GO to N25.

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N25 CLEAN THE LH FRONT IMPACT SEVERITY SENSOR MOUNTING SURFACE AND CARRY OUT THE SELF-TEST


- Remove the LH front impact severity sensor. Refer to Front Impact Severity Sensor Front Impact Severity Sensor.
- Clean and repair the mounting surface as necessary.
- Clean the LH front impact severity sensor mounting bolts.
- Install the LH front impact severity sensor. Refer to Front Impact Severity Sensor Front Impact Severity Sensor.
- Repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Enter the following diagnostic mode on the scan tool: Self-Test - RCM.
- Enter the following diagnostic mode on the scan tool: DataLogger - RCM - View and Record All B2296 Fault PIDs.
- Refer to PID list in Normal Operation to view B2296 fault PIDs.
- Do any on-demand B2296 fault PIDs indicate a fault?

Yes
GO to N31.

No
Fault corrected. GO to N44.

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N26 CHECK CIRCUITS 617 (PK/OG) AND 618 (VT/LG) FOR A SHORT TO VOLTAGE BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: LH Front Impact Severity Sensor C1465.
- Disconnect: RCM C310a and C310b.
- Repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Ignition ON.
- Measure the voltage between LH front impact severity sensor:
- C1465-1, circuit 617 (PK/OG), harness side and ground.
- C1465-2, circuit 618 (VT/LG), harness side and ground.




- Is voltage present on either circuit?

Yes
REPAIR circuit 617 (PK/OG) or 618 (VT/LG). GO to N44.

No
GO to N31.

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N27 CHECK CIRCUITS 617 (PK/OG) AND 618 (VT/LG) FOR A SHORT TO GROUND BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: LH Front Impact Severity Sensor C1465.
- Disconnect: RCM C310a and C310b.
- Measure the resistance between LH front impact severity sensor:
- C1465-1, circuit 617 (PK/OG), harness side and ground.
- C1465-2, circuit 618 (VT/LG), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to N31.

No
REPAIR circuits 617 (PK/OG) or 618 (VT/LG). GO to N44.

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N28 CHECK CIRCUIT 617 (PK/OG) FOR AN OPEN BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: LH Front Impact Severity Sensor C1465.
- Disconnect: RCM C310a and C310b.
- Measure the resistance between RCM C310b-19, circuit 617 (PK/OG), harness side and LH front impact severity sensor C1465-1, circuit 617 (PK/OG), harness side.




- Is the resistance less than 0.5 ohm?

Yes
GO to N29.

No
REPAIR circuit 617 (PK/OG). GO to N44.

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N29 CHECK CIRCUIT 618 (VT/LG) FOR AN OPEN BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR


- Measure the resistance between RCM C310b-20, circuit 618 (VT/LG), harness side and LH front impact severity sensor
C1465-2, circuit 618 (VT/LG), harness side.




- Is the resistance less than 0.5 ohm?

Yes
GO to N30.

No
REPAIR circuit 618 (VT/LG). GO to N44.

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N30 CHECK FOR A SHORT BETWEEN CIRCUITS 617 (PK/OG) AND 618 (VT/LG) BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR


- Measure the resistance between LH front impact severity sensor C1465-1, circuit 617 (PK/OG), harness side and LH front impact severity sensor C1465-2, circuit 618 (VT/LG), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to N31.

No
REPAIR circuits 617 (PK/OG) and 618 (VT/LG). GO to N44.

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