DTC B0001 or B0002

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC B0001 Steering Wheel Module Stage 1 High Control DTC B0002 Steering Wheel Module Stage 2 High Control Diagnostic Fault Information

Circuit	Circuit Functio	Short to n Ground	Low Resista	High ncReesista	Open ncCeircuit	Short to Voltage	Signal Performa
3021	Control	B0001 11	B0001 1A	B0001 1B	B0001 13	B0001 12	—
3020	Control	B0001 11	B0001 1A	B0001 1B	B0001 13	B0001 12	—
3023	Control	B0002 11	B0002 1A	B0002 1B	B0001 13	B0002 12	—
3022	Control	B0002 11	B0002 1A	B0002 1B	B0001 13	B0002 12	—

Circuit/System Description The F107 Steering Wheel Airbag is a dual-stage inflator located in the steering wheel. The F107  Steering Wheel Airbag contains a housing, inflatable Airbag, an initiating device, a canister of gas generating material and, in some cases, stored compressed gas. The F107 Steering Wheel Airbag uses two discrete deployment loops to supply current and deploy each state of the Airbag. Each deployment loop has a high control circuit that will supply voltage to deploy the Airbag and a low control circuit that will supply ground to deploy the Airbag. Stage 1 uses circuit 3021 as a high control and circuit 3020 as a low control. Stage 2 uses circuit 3023 as a high control and circuit  3022 as a low control. Based on inputs from the impact sensors, the K36 Restraints Control Module will command deployment of Stage 1 or Stage 2 of the F107 Steering Wheel Airbag depending on crash specifics. To deploy the F107 Steering Wheel Airbag, the K36 Restraints Control Module will simultaneously apply voltage to the high control circuit and ground to the low control circuit. The X85 Steering Wheel Airbag Coil contains a coil of ribbon cable that allows multiple full rotations of the steering wheel while maintaining continuity of the control circuits. Conditions for Running the DTC Ignition ON Ignition voltage is between 9–16 V Conditions for Setting the DTC B0001 11 Circuit 3021 or circuit 3020 is shorted to ground for 2 s. B0002 11 Circuit 3023 or circuit 3022 is shorted to ground for 2 s. B0001 12 Circuit 3021 or circuit 3020 is shorted to voltage for 2 s. B0002 12 Circuit 3023 or circuit 3022 is shorted to voltage for 2 s. B0001 13 Circuit 3021 or circuit 3020 is open for 2 s. B0002 13 Circuit 3023 or circuit 3022 is open for 2 s. B0001 1A Circuit 3021 or circuit 3020 resistance is less than 1.7 Ω for 2 s. B0002 1A Circuit 3023 or circuit 3022 resistance is less than 1.7 Ω for 2 s. B0001 1B Circuit 3021 or circuit 3020 resistance is greater than 4.4 Ω for 2 s. B0002 1B Circuit 3023 or circuit 3022 resistance is greater than 4.4 Ω for 2 s. Action Taken When the DTC Sets Airbag Indicator ON. The inflatable restraint sensing and diagnostic module will store a DTC, however if an event occurs the system will still attempt deployment. Conditions for Clearing the DTC A current DTC will clear when the diagnostic runs and passes. A history DTC will clear after 100 consecutive malfunction-free ignition cycles. Diagnostic Aid

Note

Verify the proper Steering Wheel Airbag installation procedure is followed by referring to Steering Wheel Airbag Replacement The following diagnostic aids apply for both current and history DTCs. Always test the harness side when circuit testing deployment loops. Never test a component on a deployment loop with the DVOM. Refer to SIR Disabling and Enabling. Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with a reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections. A worn steering wheel Airbag coil can cause a repeated history DTC to set. To verify this condition, refer to Circuit/System Testing. An incorrectly seated connector can cause an open/high resistance condition. Check the circuit terminals for fretting or incorrectly seated connector if a DTC with symptom byte 1B is set. Reference Information Schematic Reference SIR Schematics Connector End View Reference Master Electrical Component List Description and Operation Supplemental Inflatable Restraint System Description and Operation Electrical Information Reference Circuit Testing Testing for Intermittent Conditions and Poor Connections Wiring Repairs Connector Repairs Scan Tool Reference Control Module References for scan tool information Special Tools EL-38125-580 Terminal Release Tool Kit Circuit/System Verification

Note

The condition may be intermittent and require driving the vehicle, then reviewing the snapshot to verify resistance parameters do not drop out or spike. Refer to Testing for Intermittent Conditions and Poor Connections

1. Verify the appropriate scan tool Deployment Loop Resistance parameter stays consistently between 2.1 and 4.0 Ω without any spikes or dropouts while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction. ⇒ If less than 2.1 or greater than 4.0 Ω Refer to Circuit/System Testing. ⇓ If within 2.1 and 4.0 Ω without any spikes or dropouts
2. A fault is not currently present and may be an intermittent condition. Circuit/System Testing

Note

Refer to SIR Service Precautions. Refer to SIR Disabling and Enabling. Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector. Steering Wheel Airbag Steering wheel Airbag coil Restraints Control Module Airbag wiring harness connector Restraints Control Module wiring harness connector The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click.

1. Ignition OFF.
2. Verify SIR system is disabled.
3. Disconnect the appropriate connector at the F107 Steering Wheel Airbag: DTC B0001 = X1 DTC B0002 = X2
4. Test for greater than 25 Ω between control circuit terminal 1 and control circuit terminal 2. ⇒ If 25 Ω or less 4.1. Verify the appropriate circuits are not shorted together: DTC B0001 = Circuit 3021 and circuit 3020 DTC B0002 = Circuit 3023 and circuit 3022 ⇒ If a short between the circuit is found, repair the fault on the circuit. ⇓ If a short between the circuits is not found 4.2. Replace the K36 Restraints Control Module. ⇓ If greater than 25 Ω
5. Ignition ON.
6. Verify SIR system is disabled.
7. Test for less than 11 V between the control circuit terminals listed below and ground: Control circuit terminal 1 Control circuit terminal 2 ⇒ If 11 V or greater 7.1. Test the following circuits for a short to voltage: DTC B0001 = Circuit 3021 and circuit 3020 DTC B0002 = Circuit 3023 and circuit 3022 ⇒ If a short to voltage is found, repair the fault on the circuit. ⇓ If a short to voltage is not found 7.2. Replace the K36 Restraints Control Module. ⇓ If less than 11 V
8. Ignition OFF.
9. Verify SIR system is disabled.
10. Test for greater than 25 Ω between the control circuit terminals listed below and ground: Control circuit terminal 1 Control circuit terminal 2 ⇒ If 25 Ω or less 10.1. Test the following circuits for a short to ground: DTC B0001 = Circuit 3021 and circuit 3020 DTC B0002 = Circuit 3023 and circuit 3022 ⇒ If a short to ground is found, repair the fault on the circuit. ⇓ If a short to ground is not found 10.2. Replace the K36 Restraints Control Module. ⇓ If greater than 25 Ω
11. Ignition OFF.
12. Verify SIR system is disabled.
13. Install a 3 A fused jumper wire between control circuit terminal 1 and control circuit terminal 2, ignition ON.
14. Verify the appropriate scan tool Deployment Loop Resistance parameter is consistently less than 2 Ω while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction. ⇒ If the reading is erratic while turning the steering wheel Replace the X85 Steering Wheel Airbag Coil. ⇒ If 2 Ω or greater 14.1. Ignition OFF. 14.2. Verify SIR system is disabled. 14.3. Test the following circuits for an open/high resistance: DTC B0001 = Circuit 3021 and circuit 3020 DTC B0002 = Circuit 3023 and circuit 3022 ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found 14.4. Replace the K36 Restraints Control Module. ⇓ If less than 2 Ω
15. Ignition OFF, connect the harness connector at the F107 Steering Wheel Airbag and press in the CPA (if equipped) until an audible and/or tactile click is heard.
16. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
17. Verify DTC B0001 or B0002 is not set. ⇒ If DTC B0001 or B0002 is set Replace the F107 Steering Wheel Airbag. ⇓ If DTC B0001 or B0002 is not set
18. A fault is not currently present and may be an intermittent condition. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Steering Wheel Airbag Replacement Steering Wheel Airbag Coil Replacement Control Module References for control module replacement, programming, and setup