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| • | 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 provide an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Driver Seat Belt Anchor Pretensioner Low Control | B001A 02, B001A 0E | B001A 0D | B001A 04 | B001A 01 | -- |
Driver Seat Belt Anchor Pretensioner High Control | B001A 02, B001A 0E | B001A 0D | B001A 04 | B001A 01 | -- |
Passenger Seat Belt Anchor Pretensioner Low Control | B001B 02, B001B 0E | B001B 0D | B001B 04 | B001B 01 | -- |
Passenger Seat Belt Anchor Pretensioner High Control | B001B 02, B001B 0E | B001B 0D | B001B 04 | B001B 01 | -- |
During a side or frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the appropriate seat belt anchor pretensioner. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage.
A shorting bar used within the seat belt anchor pretensioner connector will short together both seat belt anchor pretensioner high and low control circuits when the connector is disconnected; this will help to prevent unwanted deployment of the pretensioner during servicing.
Ignition voltage is between 9-16 V.
The seat belt anchor pretensioner control circuit is short circuited to voltage for 120 milliseconds.
The seat belt anchor pretensioner control circuit is short circuited to ground for 120 milliseconds.
The seat belt anchor pretensioner control circuit is open for 120 milliseconds.
The seat belt anchor pretensioner deployment loop resistance is more than 4.2 Ω for 120 milliseconds.
The seat belt anchor pretensioner deployment loop resistance is less than 1.7 Ω for 120 milliseconds.
| • | The SDM requests the instrument cluster to illuminate the AIR BAG indicator. |
| • | The SDM will store a DTC, however if an event occurs the system will still attempt deployments. |
| • | The condition for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Note: The following diagnostic aids apply for both current and history DTCs.
An incorrectly installed CPA or incorrectly seated connector can cause a shorting bar to short both control circuits together. Check the connectors and CPAs if a DTC with symptom byte 02 or 0E is set, to ensure that the shorting bars are not causing the circuits to be shorted together. Shorting bars locations are listed below:
| • | Inline connectors - on the seat belt anchor pretensioner side of the harness connector |
| • | Harness side of the SDM connector |
Terminal fretting, an incorrectly installed CPA, or incorrectly seated connector can cause an open/high resistance condition. Check the circuit terminals for fretting, incorrectly installed CPAs, or incorrectly seated connectors if a DTC with symptom byte 04 or 0D is set.
If the seat belt anchor pretensioner has deployed under unexpected conditions and/or DTC with symptom byte 01 is set, check both control circuits for a short to voltage.
SIR System Description and Operation
Control Module References for scan tool information
Refer to SIR Service Precautions
Note: 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 anchor pre-tensioner • SDM • Seat belt anchor pre-tensioner wiring harness connector • SDM wiring harness connector
Note: The connector and connector position assurance (CPA) may seat independently of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.| • | F113 Seat belt anchor pretensioner |
| • | Any inline harness |
| • | K36 SDM |
If less than 2.1 or greater than 4.0 Ω
Refer to Circuit/System Testing.
If there are spikes or dropouts, perform the following
| • | Inspect each connector terminal and harness for damage or corrosion and repair as necessary |
| • | Apply Nyogel lubricant 760G to each connector terminal |
| • | Insure each connector and CPA is correctly seated. |
If within 2.1 and 4.0 Ω without any spikes or dropouts
Note: Refer to SIR Service Precautions .
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 anchor pre-tensioner |
| • | SDM |
| • | Seat belt anchor pre-tensioner wiring harness connector |
| • | SDM wiring harness connector |
Note: The connector and connector position assurance (CPA) may seat independently of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.| • | F113 Driver seat belt anchor pretensioner terminal 1 and 2 |
| • | F113 Passenger seat belt anchor pretensioner terminal 1 and 2 |
If 25 Ω or less
| 2.1. | Disconnect the harness connector at the K36 SDM. |
| 2.2. | Test for infinite resistance between the two control circuits. |
If less than infinite resistance, repair the short between the two circuits.
If infinite resistance, replace the K36 SDM.
If greater than 25 Ω
| • | F113 seat belt anchor pretensioner control circuit terminal 1 |
| • | F113 seat belt anchor pretensioner control circuit terminal 2 |
If 11 V or greater
| 4.1. | Ignition OFF, disconnect the harness connector at the K36 SDM, ignition ON. |
| 4.2. | Test for less than 1 V between the control circuit and ground. |
If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the K36 SDM.
If less than 11 V
| • | F113 seat belt anchor pretensioner control circuit terminal 1 |
| • | F113 seat belt anchor pretensioner control circuit terminal 2 |
If 25 Ω or less
| 6.1. | Disconnect the harness connector at the K36 SDM. |
| 6.2. | Test for infinite resistance between the control circuit and ground. |
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the K36 SDM.
If greater than 25 Ω
| • | F113 Driver seat belt anchor pretensioner terminal 1 and 2 |
| • | F113 Passenger seat belt anchor pretensioner terminal 1 and 2 |
If 2 Ω or greater
| 8.1. | Ignition OFF, disconnect the harness connector at the K36 SDM. |
| 8.2. | Test for less than 2 Ω in each control circuit end to end. |
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, replace the K36 SDM.
If less than 2 Ω
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, programming and setup |
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