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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 provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Driver Seat Side Air Bag High Control | B0014 02, B0014 0E | B0014 0D | B0014 04, B0014 0D | B0014 01 | -- |
Driver Seat Side Air Bag Low Control | B0014 02, B0014 0E | B0014 0D | B0014 04, B0014 0D | B0014 01 | -- |
Passenger Seat Side Air Bag High Control | B0021 02, B0021 0E | B0021 0D | B0021 04, B0021 0D | B0021 01 | -- |
Passenger Seat Side Air Bag Low Control | B0021 02, B0021 0E | B0021 0D | B0021 04, B0021 0D | B0021 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 an air bag. There are 2 shorting bars used within the connector that will short together the control circuits, when the connector is disconnected. This will help to prevent unwanted deployment of the air bag or retractor pretensioner during servicing.
Ignition voltage is between 9-16 V.
The air bag control circuit is shorted to voltage for 2 seconds.
The air bag control circuit is shorted to ground for 2 seconds.
The air bag control circuit is open for 2 seconds.
The air bag deployment loop resistance is greater than 4.2 Ω for 2 seconds.
The air bag deployment loop resistance is less than 1.4 Ω for 2 seconds.
| • | 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 the shorting bars are not causing the circuits to be shorted together. Shorting bars are used in the locations listed below:
| • | Left and right seat side air bags |
| • | Left and right roof rail air bags |
| • | Inline connectors - on the side of the harness connector |
| • | Harness side of the SDM connector |
Terminal fretting or 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 04 or 0D is set. DTCs of deployment loops which are in the seat can occur because of stress or damage to the harness due to seat movement. Move the seat to the full extend of travel while using the scan tool to observe deployment type loop parameters.
If the retractor pretensioner, passenger instrument panel air bags, roof rail air bags, or seat side air bag has inflated 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
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 retractor pretensioner |
| • | Passenger instrument panel air bag |
| • | Side air bag |
| • | Roof rail air bag |
| • | SDM |
| • | All wiring harness connectors |
| • | 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.
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.| • | F106 side air bag |
| • | 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
If 25 Ω or less
| 2.1. | Disconnect the X2 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
| • | Control circuit terminal 1 |
| • | Control circuit terminal 2 |
If 11 V or greater
| 4.1. | Ignition OFF, disconnect the X2 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
| • | Control circuit terminal 1 |
| • | Control circuit terminal 2 |
If 25 Ω or less
| 6.1. | Disconnect the X2 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
If 2 Ω or greater
| 8.1. | Ignition OFF, disconnect the X2 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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