Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2009 >> Explorer Sport Trac 4WD V6-4.0L >> Repair and Diagnosis >> Restraints and Safety Systems >> Air Bag Systems >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test H: DTC B2293 >> H16-H29

H16-H29




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


Pinpoint Tests

Pinpoint Test H: DTC B2293

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 all front air bag module circuits (loop) for an acceptable resistance range, unacceptable voltage and shorts to ground. The RCM will set on-demand and store DTC B2293 in memory if any of these conditions are detected. If the RCM detects a fault on any of the front air bag circuits, it will store DTC B2293 in memory and send a message to the Instrument Cluster (IC) module to illuminate the air bag warning indicator.

As the RCM continuously monitors all front air bag module circuits for resistance, it expects a normal loop resistance between 1.31 to 4.29 ohms.

If any loop (loop 1, loop 2, canister vent and/or adaptive tether) resistance for the driver and/or passenger air bag is between 0.9 and 1.31 or between 4.29 and 5 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 0.9 ohm or greater than 5 ohms.









a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2293. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2293.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Clockspring
- Air bag module
- RCM



PINPOINT TEST H: DTC B2293

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: Always tighten the fasteners of the restraints control module (RCM) and impact sensor (if equipped) to the specified torque. Failure to do so may result in incorrect restraint system operation, which increases the risk of personal injury or death in a crash.

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.

-------------------------------------------------
H16 CHECK THE DRIVER AIR BAG MODULE LOOP 2 RESISTANCE PID (D_ABAGR2) WHILE CARRYING OUT A HARNESS TEST


- NOTE: Do not remove the driver air bag module from its mounted position at this time.
- With the driver air bag in its mounted position, continue monitoring the D_ABAGR2 (Driver Air Bag #2 Resistance) resistance PID while carrying out a harness test of the driver air bag circuits and accessible connectors (including any inline connectors), by wiggling and flexing the wire harness, connectors, tilting and rotating the steering wheel frequently.
- Does the resistance PID value read between 1.31 and 4.29 ohms while carrying out the harness test?

Yes
DEPOWER the SRS and REPAIR the connector, terminals or wire harness or INSTALL a new clockspring as needed.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number
GO to H88.

No
If the driver air bag module loop 2 resistance PID is less than 1.31 ohms, GO to H17.

If the driver air bag module loop 2 resistance PID is greater than 4.29 ohms, GO to H20.

-------------------------------------------------
H17 CHECK THE DRIVER AIR BAG MODULE LOOP 2 FAULT PIDs (2293_20_OD) AND (2293_21_OD) FOR A CHANGE IN FAULT STATUS


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.
- Remove the driver air bag module. Refer to Driver Air Bag Module Driver Air Bag Module.
- Repower the SRS. Do not prove out the system 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.
- 2293_20_OD (Air Bag Inflator Circuit Resistance Low - Loop No. 2, Front Driver Side)
- 2293_21_OD (Air Bag Circuit Open - Loop No. 2, Front Driver Side)
- DIAGNOSTIC TIP: When viewing DTC B2293 on-demand fault PIDs with the driver air bag module disconnected, open circuit faults would normally be retrieved for loop 1, loop 2 and canister vent.
- Did the driver air bag module loop 2 on-demand fault PIDs change from indicating a low resistance to an open circuit fault?

Yes
GO to H77.

No
GO to H18.

-------------------------------------------------

H18 CHECK THE DRIVER AIR BAG MODULE LOOP 2 FAULT PIDs (2293_20_OD) AND (2293_21_OD) FOR A CHANGE IN FAULT STATUS (CLOCKSPRING DISCONNECTED)


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.
- Disconnect: Clockspring C218a.
- 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.
- 2293_20_OD (Air Bag Inflator Circuit Resistance Low - Loop No. 2, Front Driver Side)
- 2293_21_OD (Air Bag Circuit Open - Loop No. 2, Front Driver Side)
- DIAGNOSTIC TIP: When viewing DTC B2293 on-demand fault PIDs with the driver air bag module/clockspring disconnected, open circuit faults would normally be retrieved for loop 1, loop 2 and canister vent.
- Did the driver air bag module loop 2 on-demand fault PIDs change from indicating a low resistance to an open circuit fault?

Yes
GO to H79.

No
GO to H19.

-------------------------------------------------
H19 CHECK THE RCM FOR LOW RESISTANCE


- 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.
- Measure resistance between RCM C310a pin 15 and C310a pin 16, component side.




- Is resistance greater than 10,000 ohms?

Yes
REPAIR circuits CR102 (BU) and RR102 (WH). GO to H88.

No
GO to H80.

-------------------------------------------------
H20 CHECK THE DRIVER AIR BAG MODULE LOOP 2 FAULT PIDs (2293_21_OD) AND (2293_20_OD) FOR A CHANGE IN FAULT STATUS


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.
- Remove the driver air bag module. Refer to Driver Air Bag Module Driver Air Bag Module.
- Connect a fused jumper wire between driver air bag module loop 2 C216b-1, harness side and C216b-2, harness side.
- Repower the SRS. Do not prove out the system 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.
- 2293_20_OD (Air Bag Inflator Circuit Resistance Low - Loop No. 2, Front Driver Side)
- 2293_21_OD (Air Bag Circuit Open - Loop No. 2, Front Driver Side)
- DIAGNOSTIC TIP: When viewing DTC B2293 on-demand fault PIDs with the driver air bag module loop 2 circuits shorted together, a low resistance fault would normally be retrieved for loop 2. Loop 1 and canister vent will show an open circuit fault.
- Did the driver air bag module loop 2 on-demand fault PIDs change from indicating an open circuit to a low resistance fault?

Yes
GO to H77.

No
GO to H21.

-------------------------------------------------
H21 CHECK THE DRIVER AIR BAG MODULE LOOP 2 FAULT PIDs (2293_21_OD) AND (2293_20_OD) FOR A CHANGE IN FAULT STATUS (CLOCKSPRING DISCONNECTED)


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.
- Remove the jumper wire from driver air bag module loop 2 C216b.
- Disconnect: Clockspring C218a.
- Connect a fused jumper wire between clockspring C218a-2, circuit CR102 (BU), harness side and clockspring C218a-10, circuit RR102 (WH), harness side.
- 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.
- 2293_20_OD (Air Bag Inflator Circuit Resistance Low - Loop No. 2, Front Driver Side)
- 2293_21_OD (Air Bag Circuit Open - Loop No. 2, Front Driver Side)
- DIAGNOSTIC TIP: When viewing DTC B2293 on-demand fault PIDs with the driver air bag module loop 2 circuits shorted together, a low resistance fault would normally be retrieved for loop 2. Loop 1 and canister vent will show an open circuit fault.
- Did the driver air bag module loop 2 on-demand fault PIDs change from indicating an open circuit to a low resistance fault?

Yes
GO to H79.

No
GO to H22.

-------------------------------------------------
H22 CHECK THE DRIVER AIR BAG MODULE LOOP 2 CIRCUITS FOR AN OPEN BETWEEN THE CLOCKSPRING AND RCM


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Remove the jumper wire from the clockspring C218a.
- Disconnect: RCM C310a and C310b.
- Measure resistance between RCM C310a, harness side and clockspring C218a, harness side using the following chart.









- Are resistances less than 0.5 ohm?

Yes
GO to H80.

No
REPAIR circuit CR102 (BU) or RR102 (WH). GO to H88.

-------------------------------------------------
H23 CHECK THE DRIVER AIR BAG MODULE LOOP 2 FAULT PIDs (2293_23_OD) AND (2293_21_OD) FOR A CHANGE IN FAULT STATUS


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.
- Remove the driver air bag module. Refer to Driver Air Bag Module Driver Air Bag Module.
- Repower the SRS. Do not prove out the system 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.
- 2293_21_OD (Air Bag Circuit Open - Loop No. 2, Front Driver Side)
- 2293_23_OD (Air Bag Circuit Short to Ground - Loop No. 2, Front Driver Side)
- DIAGNOSTIC TIP: When viewing DTC B2293 on-demand fault PIDs with the driver air bag module disconnected, open circuit faults would normally be retrieved for loop 1, loop 2 and canister vent.
- Did the driver air bag module loop 2 on-demand fault PIDs change from indicating a short to ground to an open circuit fault?

Yes
GO to H77.

No
GO to H24.

-------------------------------------------------
H24 CHECK THE DRIVER AIR BAG MODULE LOOP 2 FAULT PIDs (2293_23_OD) AND (2293_21_OD) FOR A CHANGE IN FAULT STATUS (CLOCKSPRING DISCONNECTED)


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.
- Disconnect: Clockspring C218a.
- 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.
- 2293_21_OD (Air Bag Circuit Open - Loop No. 2, Front Driver Side)
- 2293_23_OD (Air Bag Circuit Short to Ground - Loop No. 2, Front Driver Side)
- DIAGNOSTIC TIP: When viewing DTC B2293 on-demand fault PIDs with the driver air bag module disconnected, open circuit faults would normally be retrieved for loop 1 and loop 2.
- Did the driver air bag module loop 2 on-demand fault PIDs change from indicating a short to ground to an open circuit fault?

Yes
GO to H79.

No
GO to H25.

-------------------------------------------------
H25 CHECK DRIVER AIR BAG MODULE LOOP 2 CIRCUITS FOR A SHORT TO GROUND (CLOCKSPRING DISCONNECTED)


- 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.
- Measure resistance between clockspring:
- C218a-2, circuit CR102 (BU), harness side and ground.
- C218a-10, circuit RR102 (WH), harness side and ground.




- Are resistances greater than 10,000 ohms?

Yes
GO to H80.

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 CR102 (BU) or RR102 (WH). GO to H88.

-------------------------------------------------
H26 CHECK THE DRIVER AIR BAG MODULE LOOP 2 FAULT PIDs (2293_22_OD) AND (2293_21_OD) FOR A CHANGE IN FAULT STATUS (CLOCKSPRING DISCONNECTED)


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.
- Remove the driver air bag module. Refer to Driver Air Bag Module Driver Air Bag Module.
- Disconnect: Clockspring C218a.
- Repower the SRS. Do not prove out the system 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.
- 2293_21_OD (Air Bag Circuit Open - Loop No. 2, Front Driver Side)
- 2293_22_OD (Air Bag Circuit Short to Battery - Loop No. 2, Front Driver Side)
- DIAGNOSTIC TIP: When viewing DTC B2293 on-demand fault PIDs with the driver air bag module/clockspring disconnected, open circuit faults would normally be retrieved for loop 1 and loop 2.
- Did the driver air bag module loop 2 on-demand fault PIDs change from indicating a short to battery to an open circuit fault?

Yes
GO to H79.

No
GO to H27.

-------------------------------------------------
H27 CHECK DRIVER AIR BAG MODULE LOOP 2 CIRCUITS FOR A SHORT TO VOLTAGE (CLOCKSPRING DISCONNECTED)


- 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.
- Repower the SRS. Do not prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Ignition ON.
- Measure voltage between clockspring:
- C218a-2, circuit CR102 (BU), harness side and ground.
- C218a-10, circuit RR102 (WH), 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 CR102 (BU) or RR102 (WH). GO to H88.

No
GO to H80.

-------------------------------------------------
H28 CHECK THE DRIVER AIR BAG MODULE CANISTER VENT RESISTANCE PID (D_VENT)


- Enter the following diagnostic mode on the scan tool: DataLogger - RCM - PID.
- Enter the following diagnostic mode on the scan tool: D_VENT (Airbag Canister Vent Resistance, Driver Side) Resistance PID.
- Does the resistance PID value read between 1.31 and 4.29 ohms?

Yes
GO to H80.

No
GO to H29.

-------------------------------------------------
H29 CHECK THE DRIVER AIR BAG MODULE CANISTER VENT RESISTANCE PID (D_VENT) WHILE CARRYING OUT A HARNESS TEST


- NOTE: Do not remove the driver air bag module from its mounted position at this time.
- With the driver air bag in its mounted position, continue monitoring the D_VENT (Airbag Canister Vent Resistance, Driver Side) resistance PID while carrying out a harness test of the driver air bag circuits and accessible connectors (including any inline connectors) by wiggling and flexing the wire harness, connectors, tilting and rotating the steering wheel frequently.
- Does the resistance PID value read between 1.31 and 4.29 ohms while carrying out the harness test?

Yes
DEPOWER the SRS and REPAIR the connector, terminals or wire harness or INSTALL a new clockspring as needed. REFER to Clockspring Service and Repair.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number
GO to H88.

No
If the driver air bag module canister vent resistance PID is less than 1.31 ohms, GO to H30.

If the driver air bag module canister vent resistance PID is greater than 4.29 ohms, GO to H33.

-------------------------------------------------
pro multis · About Operation CHARM