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Part 3




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

Pinpoint Test - Supplemental Restraint System (SRS)

Pinpoint Test F: 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 driver/passenger air bag loop 1 and 2 circuits for the following faults:

- Resistance out of range
- Unexpected voltage
- Short to ground

The RCM analyzes the deployment loop resistance and uses this measurement in combination with an age correction factor to determine if a fault exists. The value displayed in the PID is the deployment loop resistance as measured by the RCM. If the value displayed is lower or higher than the desired range (refer to diagram below), the RCM can set a DTC. As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. The RCM fault trigger threshold may vary as the vehicle ages. Small variations in resistance can occur due to the effect of road vibrations on terminal fit and/or temperature changes. These variables can result in an intermittent fault. For this reason, the test will require the PID value to be within the desired range before the fault is considered repaired, regardless if the module is reporting an on-demand DTC at time of diagnosis. Following this direction will help make sure that minor changes in resistance do not create a repeat concern. This test will use a process of elimination to diagnose each part of the deployment loop circuit including:

- Wiring
- Connections
- Clockspring
- Driver air bag module
- Passenger air bag module
- RCM

Driver Air Bag





Passenger Air Bag









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
- Driver air bag module
- Passenger air bag module
- RCM



PINPOINT TEST F: 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: 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 making 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: Supplemental Restraint System (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.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

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F35 CHECK PASSENGER AIR BAG MODULE LOOP 1 CIRCUITS FOR A SHORT TO GROUND


- 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 the resistance between passenger air bag module:
- C256A-1, circuit CR103 (GY/BU), harness side and ground.
- C256A-2, circuit RR103 (VT/GN), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to F49.

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 CR103 (GY/BU) or RR103 (VT/GN). GO to F56.

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F36 CHECK PASSENGER AIR BAG MODULE LOOP 1 CIRCUITS FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Air Bag Module C256A and C256B.
- 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 air bag module:
- C256A-1, circuit CR103 (GY/BU), harness side and ground.
- C256A-2, circuit RR103 (VT/GN), 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 CR103 (GY/BU) or RR103 (VT/GN). GO to F56.

No
GO to F49.

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F37 CHECK THE PASSENGER AIR BAG MODULE LOOP 2 RESISTANCE (P_ABAGR2) PID


- Enter the following diagnostic mode on the scan tool: DataLogger - RCM.
- Enter the following diagnostic mode on the scan tool: P_ABAGR2 PID.
- Is the PID value between 1.4 and 3.5 ohms?

Yes
GO to F49.

No
GO to F38.

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F38 CHECK THE PASSENGER AIR BAG MODULE LOOP 2 RESISTANCE (P_ABAGR2) PID WHILE CARRYING OUT A HARNESS TEST


- NOTE: Do not remove the passenger air bag module from its mounted position at this time.
- With the passenger air bag in its mounted position, continue monitoring the P_ABAGR2 PID while carrying out a harness test of the passenger air bag module circuits and accessible connectors (including any in-line connectors), by wiggling connectors and flexing the wire harness.
- Does the PID value read between 1.4 and 3.5 ohms while carrying out the harness test?

Yes
DEPOWER the SRS and REPAIR the connector, terminals or wire harness as needed.

Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number

GO to F56.

No
For PID value less than 1.4 ohms, GO to F39.

For PID value greater than 3.5 ohms, GO to F41.

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F39 CHECK THE PASSENGER AIR BAG MODULE LOOP 2 FOR LOW RESISTANCE FAULT


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 Air Bag Module C256b.
- 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.
- 2293_16_OD
- 2293_17_OD
- DIAGNOSTIC TIP: When viewing 2293 on-demand fault PIDs with the passenger air bag module disconnected, open circuit faults would normally be retrieved on loop 1 and 2.
- Did the on-demand fault PID change from indicating a low resistance to an open circuit fault?

Yes
GO to F47.

No
GO to F40.

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F40 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 the resistance between RCM C310A pins 13 and 14, component side.




- Is the resistance greater than 10,000 ohms?

Yes
REPAIR circuits CR104 (YE/GY) and RR104 (WH/BU). GO to F56.

No
GO to F49.

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F41 CHECK PASSENGER AIR BAG MODULE LOOP 2 FOR AN 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 Air Bag Module C256b.
- Connect a fused jumper wire between passenger air bag module C256B-1, circuit CR104 (YE/GY), harness side and C256B-2, circuit RR104 (WH/BU), 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.
- 2293_16_OD
- 2293_17_OD
- DIAGNOSTIC TIP: When viewing 2293 on-demand fault PIDs with the passenger air bag module loop 2 circuits shorted together, a low resistance fault would normally be retrieved on loop 2. Loop 1 will show an open circuit fault due to the passenger air bag module being disconnected.
- Did the on-demand fault PID change from indicating an open circuit to a low resistance fault?

Yes
GO to F47.

No
GO to F42.

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F42 CHECK PASSENGER AIR BAG MODULE LOOP 2 CIRCUITS FOR AN OPEN


- 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 passenger air bag module C256b.
- Disconnect: RCM C310A and C310B.
- Measure resistance between RCM C310A, harness side and passenger air bag module C256b, harness side using the following chart.










- Are the resistances less than 0.5 ohm?

Yes
GO to F49.

No
REPAIR circuit CR104 (YE/GY) or RR104 (WH/BU). GO to F56.

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F43 CHECK THE PASSENGER AIR BAG MODULE LOOP 2 CIRCUITS FOR A SHORT TO GROUND


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 Air Bag Module C256B.
- 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.
- 2293_17_OD
- 2293_19_OD
- DIAGNOSTIC TIP: When viewing 2293 on-demand fault PIDs with the passenger air bag module disconnected, open circuit faults would normally be retrieved on loop 1 and 2.
- Did the on-demand fault PID change from indicating a short to ground to an open circuit fault?

Yes
GO to F47.

No
GO to F44.

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F44 CHECK PASSENGER AIR BAG MODULE LOOP 2 CIRCUITS FOR A SHORT TO GROUND


- 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 the resistance between passenger air bag module:
- C256B-1, circuit CR104 (YE/GY), harness side and ground.
- C256B-2, circuit RR104 (WH/BU), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to F49.

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 CR104 (YE/GY) or RR104 (WH/BU). GO to F56.

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F45 CHECK PASSENGER AIR BAG MODULE LOOP 2 CIRCUITS FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Air Bag Module C256b.
- 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 air bag module:
- C256B-1, circuit CR104 (YE/GY), harness side and ground.
- C256B-2, circuit RR104 (WH/BU), 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 CR104 (YE/GY) or RR104 (WH/BU). GO to F56.

No
GO to F49.

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