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Home >> Mercury >> 2009 >> Sable AWD V6-3.5L >> Repair and Diagnosis >> Restraints and Safety Systems >> Air Bag Systems >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test I: LFC 24/25 DTC B2294 >> I15-I28

I15-I28





Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)

Pinpoint Tests

Pinpoint Test I: LFC 24/25 DTC B2294

Refer to Wiring Diagram Set 46, Supplemental Restraint System for schematic and connector information. Diagrams By Number

Normal Operation

The Restraints Control Module (RCM) continuously monitors the driver and passenger safety canopy module circuits (loop) for an acceptable resistance range, unacceptable voltage and shorts to ground. The RCM will set on-demand and store DTC B2294 in memory if any of these conditions are detected to be outside of their respectful range. If the RCM detects a fault, it will send a message to the Instrument Cluster (IC) module to flash a Lamp Fault Code (LFC) 24 or 25 on the air bag warning indicator.

As the RCM continuously monitors safety canopy module circuits for resistance, it expects a normal resistance between 1.50 and 3.04 ohms.

If a loop resistance is between 1.04 and 1.50 ohms or between 3.04 and 3.72 ohms, there exists a strong potential for an intermittent fault, a DTC may or may not set. The RCM will also set an on-demand DTC if the loop resistance is less than 1.04 ohm or greater than 3.72 ohms.

NOTE: When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.





a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2294. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2294.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Safety canopy module
- RCM



PINPOINT TEST I: LFC 24/25 DTC B2294

WARNING: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the Safety Canopy(R) and cause serious personal injury or death.

WARNING: Never probe the electrical connectors on air bag, Safety Canopy(R) or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification

NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

NOTE: SRS components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.

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I15 CHECK FOR A SHORT BETWEEN CIRCUITS CR111 (BN/WH) AND RR111 (YE/VT)


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- For Taurus and Sable, measure the resistance between passenger safety canopy module C9032-1, circuit CR111 (BN/WH), harness side and C9032-2, circuit RR111 (YE/VT), harness side.




- For Taurus X, measure the resistance between passenger safety canopy module C9019-1, circuit CR111 (BN/WH), harness side and C9019-3, circuit RR111 (YE/VT), harness side.




- Is resistance greater than 10,000 ohms?

Yes
GO to I23.

No
GO to I16.

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I16 CHECK THE RCM FOR LOW RESISTANCE


- Disconnect: RCM C310a and C310b.
- Measure the resistance between RCM C310b pin 1, component side, and C310b pin 2, component side.




- Is resistance greater than 10,000 ohms?

Yes
REPAIR circuits CR111 (BN/WH) and RR111 (YE/VT). GO to I28.

No
GO to I23.

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I17 CHECK THE PASSENGER SAFETY CANOPY MODULE CIRCUIT FAULT PIDs (2294_25_OD AND 2294_24_OD) FOR AN OPEN AND LOW RESISTANCE


NOTE: This pinpoint test step will attempt to change the fault reported by the RCM by inducing a different fault condition. If the fault reported changes, this indicates the RCM is functioning correctly and is not the source of the fault.

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Safety Canopy C9019 (Taurus X) C9032 (Taurus and Sable).
- For Taurus and Sable, connect a fused jumper wire between passenger safety canopy C9019-1, circuit CR111 (BN/WH), harness side and C9019-2, circuit RR111 (YE/VT), harness side.
- For Taurus X, connect a fused jumper wire between passenger safety canopy C9032-1, circuit CR111 (BN/WH), harness side and C9032-3, circuit RR111 (YE/VT), harness side.
- 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.
- 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 The Following Fault PIDs.
- 2294_24_OD (A - B or A - C Pillar Curtain Circuit Resistance Low, Passenger Side)
- 2294_25_OD (A - B or A - C Pillar Curtain Circuit Open, Passenger Side)
- DIAGNOSTIC TIP: When viewing DTC B2294 on-demand fault PIDs with the passenger safety canopy circuits shorted together, a low resistance fault would normally be retrieved.
- Did the passenger safety canopy on-demand fault PIDs change from indicating an open circuit to a low resistance fault?

Yes
GO to I22.

No
GO to I18.

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I18 CHECK CIRCUITS CR111 (BN/WH) AND RR111 (YE/VT) FOR AN OPEN BETWEEN THE RCM AND PASSENGER SAFETY CANOPY MODULE


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Remove the fused jumper wire from the passenger safety canopy electrical connector.
- Disconnect: RCM C310a and C310b.
- For Taurus and Sable, measure the resistance between RCM C310b, harness side; and passenger safety canopy module C9032, harness side using the following chart.









- For Taurus X, measure the resistance between RCM C310b, harness side; and passenger safety canopy module C9032, harness side using the following chart.









- Are resistances less than 0.5 ohm?

Yes
GO to I23.

No
REPAIR circuit CR111 (BN/WH) or RR111 (YE/VT). GO to I28.

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I19 CHECK THE PASSENGER SAFETY CANOPY MODULE CIRCUIT FAULT PIDs (2294_26_OD AND 2294_25_OD) FOR A SHORT TO GROUND AND OPEN


NOTE: This pinpoint test step will attempt to change the fault reported by the RCM by inducing a different fault condition. If the fault reported changes, this indicates the RCM is functioning correctly and is not the source of the fault.

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Safety Canopy C9019 (Taurus X) C9032 (Taurus and Sable).
- 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.
- 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 The Following Fault PIDs.
- 2294_25_OD (A - B or A - C Pillar Curtain Circuit Open, Passenger Side)
- 2294_26_OD (A - B or A - C Pillar Curtain Circuit Short to Ground, Passenger Side)
- DIAGNOSTIC TIP: When viewing DTC B2294 on-demand fault PIDs with the passenger safety canopy disconnected, an open circuit fault would normally be retrieved.
- Did the passenger safety canopy on-demand fault PIDs change from indicating a short to ground to an open circuit fault?

Yes
GO to I22.

No
GO to I20.

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I20 CHECK CIRCUITS CR111 (BN/WH) AND RR111 (YE/VT) FOR A SHORT TO GROUND BETWEEN THE RCM AND PASSENGER SAFETY CANOPY MODULE


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: RCM C310a and C310b.
- For Taurus and Sable, measure the resistance between passenger safety canopy:
- C9032-1, circuit CR111 (BN/WH), harness side and ground.
- C9032-2, circuit RR111 (YE/VT), harness side and ground.




- For Taurus X, measure the resistance between passenger safety canopy:
- C9019-1, circuit CR111 (BN/WH), harness side and ground.
- C9019-3, circuit RR111 (YE/VT), harness side and ground.




- Are resistances greater than 10,000 ohms?

Yes
GO to I23.

No
Due to the shorting bar feature in the RCM electrical connector, the fault can exist in either circuit. Do not remove or defeat the shorting bar.

REPAIR circuit CR111 (BN/WH) or RR111 (YE/VT). GO to I28.

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I21 CHECK CIRCUITS CR111 (BN/WH) AND RR111 (YE/VT) FOR A SHORT TO VOLTAGE BETWEEN THE RCM AND PASSENGER SAFETY CANOPY MODULE


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Safety Canopy C9019 (Taurus X) C9032 (Taurus and Sable).
- 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.
- For Taurus and Sable, measure the voltage between passenger safety canopy:
- C9032-1, circuit CR111 (BN/WH), harness side and ground.
- C9032-2, circuit RR111 (YE/VT), harness side and ground.




- For Taurus X, measure the voltage between passenger safety canopy:
- C9019-1, circuit CR111 (BN/WH), harness side and ground.
- C9019-3, circuit RR111 (YE/VT), harness side and ground.




- Is voltage present on either circuit?

Yes
Due to the shorting bar feature in the RCM electrical connector, the fault can exist in either circuit. Do not remove or defeat the shorting bar.

REPAIR circuit CR111 (BN/WH) or RR111 (YE/VT). GO to I28.

No
GO to I23.

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I22 CONFIRM THE SAFETY CANOPY MODULE FAULT


NOTE: Make sure all restraint system components, sensor electrical connectors and the RCM electrical connectors are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Connect: Affected Safety Canopy C9018/C9031 (Driver) C9019/C9032 (Passenger).
- Connect: 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.
- 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 B2294 Fault PIDs.
- Refer to PID list in Normal Operation to view B2294 fault PIDs.
- Does the original RCM on-demand B2294 fault PID indicate a fault?

Yes
INSTALL a new driver or passenger safety canopy. REFER to Safety Canopy Module - Taurus X Safety Canopy Module or Safety Canopy Module - Taurus, Sable Safety Canopy Module. GO to I28.

No
In the process of diagnosing the fault, the fault condition has become intermittent. Using the fault PIDs recorded, GO to the appropriate pinpoint test step and CHECK for causes of the intermittent fault in the areas previously worked in, particularly the pins and terminals of electrical connectors that were disconnected.

For 2294_28_CM (A - B or A - C Pillar Curtain Circuit Resistance Low, Driver Side), 2294_24_CM (A - B or A - C Pillar Curtain Circuit Resistance Low, Passenger Side), 2294_29_CM (A - B or A - C Pillar
Curtain Circuit Open, Driver Side) or 2294_25_CM (A - B or A - C Pillar Curtain Circuit Open, Passenger Side), GO to I24.

For 2294_30_CM (A - B or A - C Pillar Curtain Circuit Short to Ground, Driver Side) or 2294_26_CM (A - B or A - C Pillar Curtain Circuit Short to Ground, Passenger Side), GO to I26.

For 2294_31_CM (A - B or A - C Pillar Curtain Circuit Short to Battery, Driver Side) or 2294_27_CM (A - B or A - C Pillar Curtain Circuit Short to Battery, Passenger Side), GO to I27.

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I23 CONFIRM THE RCM FAULT


NOTE: Make sure all restraint system components, sensor electrical connectors and the RCM electrical connectors are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.

- Ignition OFF.
- If previously directed to disconnect any SRS component(s):
- depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- connect all previously disconnected restraint system component(s), including 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.
- 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 B2294 Fault PIDs.
- Refer to PID list in Normal Operation to view B2294 fault PIDs.
- Does the original RCM on-demand B2294 fault PID indicate a fault?

Yes
INSTALL a new RCM. REFER to Restraints Control Module (RCM) Service and Repair. GO to I28.

No
In the process of diagnosing the fault, the fault condition has become intermittent. Using the fault PIDs recorded, GO to the appropriate pinpoint test step and CHECK for causes of the intermittent fault in the areas previously worked in, particularly the pins and terminals of electrical connectors that were disconnected.

For 2294_28_CM (A - B or A - C Pillar Curtain Circuit Resistance Low, Driver Side), 2294_24_CM (A - B or A - C Pillar Curtain Circuit Resistance Low, Passenger Side), 2294_29_CM (A - B or A - C Pillar
Curtain Circuit Open, Driver Side) or 2294_25_CM (A - B or A - C Pillar Curtain Circuit Open, Passenger Side), GO to I24.

For 2294_30_CM (A - B or A - C Pillar Curtain Circuit Short to Ground, Driver Side) or 2294_26_CM (A - B or A - C Pillar Curtain Circuit Short to Ground, Passenger Side), GO to I26.

For 2294_31_CM (A - B or A - C Pillar Curtain Circuit Short to Battery, Driver Side) or 2294_27_CM (A - B or A - C Pillar Curtain Circuit Short to Battery, Passenger Side), GO to I27.

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I24 CHECK SAFETY CANOPY MODULE CIRCUIT FAULT PIDs FOR AN INTERMITTENT LOW RESISTANCE OR OPEN


- Enter the following diagnostic mode on the scan tool: DataLogger - RCM - View and Record All B2294 Fault PIDs.
- Refer to PID list in Normal Operation to view B2294 fault PIDs.
- If the fault PID was reported for the driver safety canopy, monitor the DCURTL1 (Curtain Airbag Driver Loop No.1 Resistance) resistance PID on the scan tool.
- If the fault PID was reported for the passenger safety canopy, monitor the PCURTL1 (Curtain Airbag Passenger Loop No.1 Resistance) resistance PID on the scan tool.
- NOTE: A resistance PIDs that reads between 1.04 and 1.50 ohms or between 3.04 and 3.72 ohms may or may not set an on-demand DTC, yet indicates a strong potential of an intermittent fault condition. Make sure to thoroughly check wire harness(es), connectors and terminals as they are the likely source of the fault condition.
- Attempt to recreate the fault by wiggling connectors (including any in-line connectors) and flexing the wire harness.
- Does any RCM on-demand B2294 fault PID indicate a fault is present or is any safety canopy resistance PID less than 1.50 ohms or greater than 3.04 ohms?

Yes
DEPOWER the SRS and REPAIR as necessary. Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number
GO to I28.

No
GO to I25.

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I25 CHECK THE HARNESS AND CONNECTORS


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect the affected safety canopy module C9018/C9031 (driver) or C9019/C9032 (passenger):
- inspect connector(s) (including any in-line connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
- inspect wire harness for any damage, pinched, cut or pierced wires.
- Were any concerns found?

Yes
REPAIR as necessary. Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number
GO to I28.

No
The fault is not present and cannot be recreated at this time.

CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test. REPAIR any intermittent wiring, terminal or connector concerns found. GO to I28.

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I26 CHECK SAFETY CANOPY MODULE CIRCUIT FAULT PIDs FOR AN INTERMITTENT A SHORT TO GROUND


- Enter the following diagnostic mode on the scan tool: DataLogger - RCM - PID.
- If the fault PID was reported for the driver safety canopy, monitor the 2294_30_OD (A - B or A - C Pillar Curtain Circuit Short to Ground, Driver Side) fault PID on the scan tool.
- If the fault PID was reported for the passenger safety canopy, monitor the 2294_26_OD (A - B or A - C Pillar Curtain Circuit Short to Ground, Passenger Side) fault PID on the scan tool.
- DIAGNOSTIC TIP: When monitoring fault PIDs with the scan tool, it may take up to a 2-second delay for the scan tool display to update.
- Attempt to recreate the fault by wiggling connectors (including any in-line connectors) and flexing the wire harness.
- Does any RCM on-demand B2294 fault PID indicate a fault is present?

Yes
DEPOWER the SRS and REPAIR as necessary. Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number
GO to I28.

No
The fault is not present and cannot be recreated at this time.

CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test. REPAIR any intermittent wiring, terminal or connector concerns found. GO to I28.

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I27 CHECK SAFETY CANOPY MODULE CIRCUIT FAULT PIDs FOR AN INTERMITTENT SHORT TO BATTERY


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- If the fault PID was reported for the driver safety canopy, disconnect the driver safety canopy module C9018/C9031.
- If the fault PID was reported for the passenger safety canopy, disconnect the passenger safety canopy module C9019/C9032.
- 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.
- DIAGNOSTIC TIP: When monitoring fault PIDs with the scan tool, it may take up to a 2-second delay for the scan tool display to update.
- Monitor the 2294_31_OD (A - B or A - C Pillar Curtain Circuit Short to Battery, Driver Side) or 2294_27_OD (A - B or A - C Pillar Curtain Circuit Short to Battery, Passenger Side) fault PIDs on the scan tool.
- Attempt to recreate the fault by wiggling connectors (including any in-line connectors) and flexing the wire harness.
- Does any RCM on-demand B2294 fault PID indicate a fault is present?

Yes
DEPOWER the SRS and REPAIR as necessary. Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number
GO to I28.

No
The fault is not present and cannot be recreated at this time.

CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test. REPAIR any intermittent wiring, terminal or connector concerns found. GO to I28.

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I28 CHECK FOR ADDITIONAL SRS DTCs


- Ignition OFF.
- WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
- Reconnect all SRS components (if previously disconnected).
- If previously directed to depower the SRS, repower the SRS. Do notprove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - Restraints.
- Are any RCM and/or OCSM DTCs retrieved indicating a fault?

Yes
Do not clear any DTCs until all DTCs have been resolved. GO to the DTC Charts for pinpoint test direction. [1][2]Diagnostic Trouble Code Descriptions

No
CLEAR all RCM and OCSM DTCs. PROVE OUT the SRS. Repair is complete. RETURN the vehicle to the customer.

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