DTC B007E or B007F

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 B007E Driver Seat Belt Retractor DTC B007F Co-Driver Seat Belt Retractor For symptom byte information refer to Symptom Byte List. Diagnostic Fault Information

Circuit	Circuit Function	Short to Ground	Low Resistan	Open/Hi cReesistan	Short gh to ce Voltage	Signal Performanc
3477	Control	B007E 11	B007E 1A	B007E 13, B007E 1B	B007E 12	—
3478	Control	B007E 11	B007E 1A	B007E 13, B007E 1B	B007E 12	—
3475	Control	B007F 11	B007F 1A	B007F 13, B007F 1B	B007F 12	—
3476	Control	B007F 11	B007F 1A	B007F 13, B007F 1B	B007F 12	—

Circuit/System Description For an overview of the component/system, refer to: Supplemental Inflatable Restraint System Description and Operation The F112D Seat Belt Retractor — Driver and F112P Seat Belt Retractor — Passenger are pyrotechnic units that contain an ignitor, which, when supplied with voltage, ignites the propellant in the gas generator. The F112 Seat Belt Retractors are respectively located on the driver and passenger center pillars. The deployment loop has a high control circuit that will supply voltage to deploy the pretensioner and a low control that will supply ground to deploy the pretensioner. The F112D Seat Belt Retractor — Driver uses circuit 3477 as high control and circuit 3478 as low control. The F112P Seat Belt Retractor — Passenger uses circuit 3475 as high control and circuit  3476 as low control. Based on inputs from the impact sensors, the K36 Restraints Control Module will command deployment of the F112 Seat Belt Retractors by simultaneously applying voltage to the high control circuit, and ground to the low control circuit Conditions for Setting the DTC B007E 11 Circuit 3477 or circuit 3478 is shorted to ground for 2 s B007F 11 Circuit 3475 or circuit 3476 is shorted to ground for 2 s B007E 12 Circuit 3477 or circuit 3478 is shorted to voltage for 2 s B007F 12 Circuit 3475 or circuit 3476 is shorted to voltage for 2 s B007E 13 Circuit 3477 or circuit 3478 is open for 2 s B007F 13 Circuit 3475 or circuit 3476 is open for 2 s B007E 1B Circuit 3477 or circuit 3478 resistance is greater than 4.2 Ω for 2 s B007F 1B Circuit 3475 or circuit 3476 resistance is greater than 4.2 Ω for 2 s B007E 1A Circuit 3477 or circuit 3478 resistance is less than 1.4 Ω for 2 s B007F 1A Circuit 3475 or circuit 3476 resistance is less than 1.4 Ω for 2 s Action Taken When the DTC Sets Airbag Indicator ON. 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: F112D Seat Belt Retractor — Driver F112P Seat Belt Retractor — Passenger ⇒ 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. Always test the harness side when circuit testing deployment loops. Never test a component on a deployment loop with the DVOM. 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 Belt Retractor – Restraints Control module – Seat Belt Retractor 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 the SIR system is disabled.
3. Disconnect the harness connector at the appropriate F112 Seat Belt Retractor.
4. Test for greater than 25 Ω between the control circuit terminals 1 and circuit terminal 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 B007E = Circuit 3477 and circuit 3478 DTC B007F = Circuit 3475 and circuit 3476 ⇒ If a short between the circuit is found, repair the fault on the circuit. ⇓ 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 B007E = Circuit 3477 and circuit 3478 DTC B00013 = Circuit 3475 and circuit 3476 ⇒ 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 B007E = Circuit 3477 and circuit 3478 DTC B000213 = Circuit 3475 and circuit 3476 ⇒ 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. Install a 3 A fused jumper wire between the control circuit terminals 1 and 2, ignition ON.
12. Verify the scan tool Deployment Loop Resistance parameter is less than 2 Ω. ⇒ If 2 Ω or greater 12.1. Verify the SIR system is disabled. 12.2. Test the following circuits for an open/high resistance: DTC B007E = Circuit 3477 and circuit 3478 DTC B007F = Circuit 3475 and circuit 3476 ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found 12.3. Replace the K36 Restraints Control Module. ⇓ If less than 2 Ω
13. Ignition OFF, connect the harness connector at the appropriate F112 Seat Belt Retractor, press in the CPA (if equipped) until an audible and/or tactile click is heard.
14. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
15. Verify DTC B007E or B007F is not set. ⇒ If DTC B007E or B007F is set Replace the appropriate F112 Seat Belt Retractor. ⇓ If DTC B007E or B007F is not set
16. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Front Seat Belt Retractor Replacement for Seat Belt Retractor replacement Control Module References for Restraints Control module replacement, programming and setup SIR/SRS Wiring Repairs