DTC B15DF or B15E3

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 B15DF Co-Driver Thorax Module High Control DTC B15E3 Driver Thorax Module High Control Diagnostic Fault Information

Circuit	Circuit Functio	Short to n Ground	Open/H Resista	Open igh Circuit nce	Low Resista	Short to ncVeoltage	Signal Performa
4956	Control	B15DF 11	B15DF 1B	B15DF 13	B15DF 1A	B15DF 12	—
4957	Control	B15DF 11	B15DF 1B	B15DF 13	B15DF 1A	B15DF 12	—
4962	Control	B15E3 11	B15E3 1B	B15E3 13	B15E3 1A	B15E3 12	—
4963	Control	B15E3 11	B15E3 1B	B15E3 13	B15E3 1A	B15E3 12	—

Circuit/System Description For an overview of the component/system, refer to: Supplemental Inflatable Restraint System Description and Operation The F106P Front Seat Outboard Seat Back Airbag- Passenger and F106D Front Seat Outboard Seat Back Airbag — Driver, are single stage inflators located within the passenger and driver seats respectively. The F106 Seat Side Airbags contain a housing, inflating device, a canister of gas generating material and, in some cases, stored compressed gas. The deployment loop has a high control circuit that will supply voltage to deploy the airbag and a low control that will supply ground to deploy the airbag. The F106P Front Seat Outboard Seat Back Airbag- Passenger uses circuit 4956 as high control and circuit 4957 as low control. The F106D Front Seat Outboard Seat Back Airbag — Driver uses circuit 4962 as high control and circuit 4963 as low control. Based on inputs from the impact sensors, the K36 Restraints Control Module will command deployment of the F106P Side Seat Airbags by simultaneously applying voltage to the high control circuit, and ground to the low control circuit . Conditions for Running the DTC Ignition voltage is between 9–16 V. Conditions for Setting the DTC B15DF 12 Circuit 4956 or circuit 4957 is shorted to voltage for 2 seconds. B15E3 12 Circuit 4962 or circuit 4963 is shorted to voltage for 2 seconds. B15DF 11 Circuit 4956 or circuit 4957 is shorted to ground for 2 seconds. B15E3 11 Circuit 4962 or circuit 4963 is shorted to ground for 2 seconds. B15DF 13 Circuit 4956 or circuit 4957 is open for 2 seconds. B15E3 13 Circuit 4962 or circuit 4963 is open for 2 seconds. B15DF 1B Circuit 4956 or circuit 4957 resistance is greater than 4.2 Ω for 2 seconds. B15E3 1B Circuit 4962 or circuit 4963 resistance is greater than 4.2 Ω for 2 seconds. B15DF 1A Circuit 4956 or circuit 4957 resistance is less than 1.4 Ω for 2 seconds. B15E3 1A Circuit 4962 or circuit 4963 resistance is less than 1.4 Ω for 2 seconds. Action Taken When the DTC Sets The Restraints Control module requests the instrument cluster to illuminate the Airbag indicator. The Restraints Control module will store a DTC, however if an event occurs the system will still attempt deployments. Conditions for Clearing the DTC The condition for setting the DTC no longer exists. A history DTC will clear once 100 malfunction-free ignition cycles have occurred. Diagnostic Aid

Note

The following diagnostic aids apply for both current and history DTCs. 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. 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 parameters stay consistently between 2.1 and 4.0 Ω: F106P Seat Side Airbag — Passenger F106D Seat Side Airbag — Driver ⇒ If less than 2.1 Ω or greater than 4.0 Ω Refer to Circuit/System Testing. ⇓ If between 2.1–4.0 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. Seat side airbag Restraints Control module All wiring harness connectors 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, scan tool disconnected.
2. Verify the SIR system is disabled.
3. Disconnect the harness connector at the appropriate F106 Seat Side Airbag.
4. Test for greater than 25 Ω between the control circuit terminals 1 and 2. ⇒ If 25 Ω or less 4.1. Disconnect the X2 harness connector at the K36 Restraints Control Module. 4.2. Verify the appropriate circuits are not shorted together. DTC B15DF = Circuit 4956 and Circuit 4957 DTC B15E3 = Circuit 4962 and Circuit 4963 ⇒ If less than infinite resistance, repair the short between the 2 circuits. ⇓ If a short between the circuits is not found 4.3. Replace the K36 Restraints Control Module. ⇓ If greater than 25 Ω
5. Ignition ON.
6. Verify the SIR system is disabled.
7. Test for less than 11 V between each control circuit terminal 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 B15DF = Circuit 4956 and Circuit 4957 DTC B15E3 = Circuit 4962 and Circuit 4963 ⇒ 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 the SIR system is disabled.
10. Test for greater than 25 Ω between each control circuit terminal 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 B15DF = Circuit 4956 and Circuit 4957 DTC B15E3 = Circuit 4962 and Circuit 4963 ⇒ 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. Verify the SIR system is disabled.
12. Install a 3 A fused jumper wire between the control circuit terminal 1 and terminal 2, ignition ON.
13. Verify the appropriate scan tool Deployment Loop Resistance parameter is less than 2 Ω. ⇒ If 2 Ω or greater 13.1. Verify the SIR system is disabled. 13.2. Test the following circuits for an open/high resistance: DTC B15DF = Circuit 4956 and Circuit 4957 DTC B15E3 = Circuit 4962 and Circuit 4963 ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found 13.3. Replace the K36 Restraints Control Module. ⇓ If less than 2 Ω
14. Ignition OFF, connect the harness connector at the F106 Seat Side Airbag, press in the CPA (if equipped) until an audible and/or tactile click is heard.
15. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
16. Verify DTC B15DF or B15E3 is not set. ⇒ If DTC B15DF or B15E3 is set Test or replace the appropriate F106 Seat Side Airbag. ⇓ If DTC B15DF or B15E3 is not set
17. A fault is not currently present and may be an intermittent condition. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Front Seat Outboard Seat Back Airbag Replacement Control Module References for Restraints Control module replacement, programming, and setup SIR/SRS Wiring Repairs