Part 2
Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
Pinpoint Test C: DTCs B0002:11, B0002:12, B0002:13 and B0002:1A
Refer to Wiring Diagram Set 46, Supplemental Restraint System for schematic and connector information [1][2]Diagrams By Number.
Normal Operation
The Restraints Control Module (RCM) continuously monitors the driver air bag module stage 2 and circuits for the following faults:
- Resistance out of range
- Unexpected voltage
- Short to ground
- Faulted driver air bag module
If a fault is detected, the RCM (Restraints Control Module) will store DTC B0002:11, B0002:12, B0002:13 or B0002:1A in memory and send a message to the Instrument Panel Cluster (IPC) to illuminate the air bag warning indicator.
The RCM (Restraints Control Module) analyzes the deployment loop resistance to determine if a fault exists. The value displayed in the PID is the deployment loop resistance as measured by the RCM (Restraints Control Module). If the value displayed is lower or higher than the desired range (refer to diagram below), the RCM (Restraints Control Module) can set a DTC. As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. Small variations in resistance can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and harness movement and can cause an increase in resistance due to wire strain. These variables can result in an intermittent fault. For this reason, the test requires 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 uses a process of elimination to diagnose each part of the deployment loop circuit including:
- Wiring
- Connections
- Clockspring
- Driver air bag module
- RCM (Restraints Control Module)
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Clockspring
- Driver air bag module
- RCM (Restraints Control Module)
C15 CHECK THE DRIVER AIR BAG STAGE 2 CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: RCM (Restraints Control Module) C2041A and C2041B.
- Repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint System) 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 clockspring:
- C2274-2, circuit CR102 (BU), harness side and ground.
- C2274-10, circuit RR102 (WH), harness side and ground.
Is voltage present on either circuit?
Yes
REPAIR circuit CR102 (BU) or RR102 (WH).
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information [1][2]Diagrams By Number.
GO to C23.
No
GO to C18.
C16 CONFIRM THE DRIVER AIR BAG MODULE FAULT
NOTE: Make sure all restraint system components and the RCM (Restraints Control Module) electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.
- Ignition OFF.
- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- If installed previously, remove the fused jumper wire from the driver air bag electrical connector.
- Install the driver air bag module. Refer to Driver Air Bag Module .
- Repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint 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 (Restraints Control Module).
Was the original DTC retrieved on-demand during self-test?
Yes
INSTALL a new driver air bag module. REFER to Driver Air Bag Module . GO to C23.
No
In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test.
For DTC B0002:13 or B0002:1A, GO to C19.
For DTC B0002:11, GO to C20.
For DTC B0002:12, GO to C21.
C17 CONFIRM THE CLOCKSPRING FAULT
NOTE: Make sure all restraint system components and the RCM (Restraints Control Module) electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.
- Ignition OFF.
- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Connect: Clockspring C2274.
- If installed previously, remove the fused jumper wire from the air bag electrical connector.
- Install the driver air bag module. Refer to Driver Air Bag Module .
- Repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint 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 (Restraints Control Module).
Was the original DTC retrieved on-demand during self-test?
Yes
INSTALL a new clockspring. REFER to Clockspring . GO to C23.
No
In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test.
For DTC B0002:13 or B0002:1A, GO to C19.
For DTC B0002:11, GO to C20.
For DTC B0002:12, GO to C21.
C18 CONFIRM THE RCM (Restraints Control Module) FAULT
NOTE: Make sure all restraint system components and the RCM (Restraints Control Module) electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.
- Ignition OFF.
- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Prior to reconnecting any previously disconnected SRS (Supplemental Restraint System) component:
- inspect connector(s) (including any in-line connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
- inspect wire harness for any damage, pinched, cut or pierced wires.
- inspect RCM (Restraints Control Module) C2041A and C2041B Connector Position Assurance (CPA) lever/lock for correct operation. Refer to Restraints Control Module (RCM) .
- repair any concerns found.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information [1][2]Diagrams By Number.
- If installed previously, remove the fused jumper wire from the driver air bag electrical connector.
- If previously removed, install the driver air bag module. Refer to Driver Air Bag Module .
- Connect: Clockspring C2274 (if previously disconnected).
- Connect: RCM (Restraints Control Module) C2041A and C2041B.
- Repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint 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 (Restraints Control Module).
Was the original DTC retrieved on-demand during self-test?
Yes
INSTALL a new RCM (Restraints Control Module). REFER to Restraints Control Module (RCM) . GO to C23.
No
In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test.
For DTC B0002:13 or B0002:1A, GO to C19.
For DTC B0002:11, GO to C20.
For DTC B0002:12, GO to C21.
C19 CHECK THE DRIVER FRONTAL STAGE 2 DEPLOYMENT CONTROL RESISTANCE (DEPLOY_01_R) PID FOR AN INTERMITTENT LOW RESISTANCE OR OPEN CIRCUIT FAULT
- Enter the following diagnostic mode on the scan tool: DataLogger- RCM (Restraints Control Module).
- DEPLOY_01_R PID
- Attempt to recreate the fault by wiggling connectors (including any in-line connectors) and flexing the wire harness, tilting and rotating the steering wheel frequently.
Does the PID value read between 2 and 3.68 ohms?
Yes
The fault is not present and cannot be recreated at this time. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test.GO to C22.
No
DEPOWER the SRS (Supplemental Restraint System) and REPAIR as necessary.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information [1][2]Diagrams By Number.
GO to C23.
C20 CHECK THE DRIVER FRONTAL STAGE 2 DEPLOYMENT CONTROL FOR AN INTERMITTENT SHORT TO GROUND FAULT
- Ignition ON.
- Attempt to recreate the fault by wiggling connectors (including any in-line connectors) and flexing the wire harness, tilting and rotating the steering wheel frequently.
- Enter the following diagnostic mode on the scan tool: Self Test- RCM (Restraints Control Module).
Was DTC B0002:11 retrieved on-demand during self-test?
Yes
DEPOWER the SRS (Supplemental Restraint System) and REPAIR as necessary.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information [1][2]Diagrams By Number.
GO to C23.
No
The fault is not present and cannot be recreated at this time. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test.GO to C22.
C21 CHECK THE DRIVER FRONTAL STAGE 2 DEPLOYMENT CONTROL FOR AN INTERMITTENT SHORT TO BATTERY FAULT
- Ignition OFF.
- Depower the SRS (Supplemental Restraint System). 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 .
- Repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint System) at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Ignition ON.
- Attempt to recreate the fault by wiggling connectors (including any in-line connectors) and flexing the wire harness, tilting and rotating the steering wheel frequently.
- Enter the following diagnostic mode on the scan tool: Self Test- RCM (Restraints Control Module).
Was DTC B0002:12 retrieved on-demand during self-test?
Yes
DEPOWER the SRS (Supplemental Restraint System) and REPAIR as necessary.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information [1][2]Diagrams By Number.
GO to C23.
No
The fault is not present and cannot be recreated at this time. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test.GO to C22.
C22 CHECK THE HARNESS AND CONNECTORS
- Ignition OFF.
- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Remove the driver air bag module.
- 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.
- Inspect RCM (Restraints Control Module) C2041A and C2041B CPA (Connector Position Assurance) lever/lock for correct operation. Refer to Restraints Control Module (RCM) .
Were any concerns found?
Yes
REPAIR as necessary.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information [1][2]Diagrams By Number.
GO to C23.
No
The fault is not present and cannot be recreated at this time. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test.GO to C23.
C23 CHECK FOR ADDITIONAL SRS (Supplemental Restraint System) 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 (Supplemental Restraint System) components (if previously disconnected).
- If previously directed to depower the SRS (Supplemental Restraint System) , repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint 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- Restraints.
NOTE: When selecting Restraints from the Self Test menu, DTCs will be retrieved from the RCM (Restraints Control Module) and OCSM (Occupant Classification System Module).
Are any RCM (Restraints Control Module) and/or OCSM (Occupant Classification System Module) DTCs retrieved on-demand during self-test?
Yes
Do not clear any DTCs until all DTCs have been resolved. GO to the DTC Charts for pinpoint test direction Air Bag Systems.
No
CLEAR all RCM (Restraints Control Module) and OCSM (Occupant Classification System Module) CMDTCs (Continuous Memory Diagnostic Trouble Codes). PROVE OUT the SRS (Supplemental Restraint System). The repair is complete. RETURN the vehicle to the customer.