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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 |
|---|---|---|---|---|---|
High Control | B0019 02, B0019 0E | B0019 0D | B0019 04, B0019 0D | B0019 01 | - |
Low Control | B0019 02, B0019 0E | B0019 0D | B0019 04, B0019 0D | B0019 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 or pretensioner. There is a shorting bar which will short together the control circuits, when the connector is disconnected. This will help to prevent unwanted deployment of the air bag or 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 connector position assurance (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:
| • | Passenger instrument panel air bag |
| • | Inline harness connectors |
| • | Harness side of the SDM connector |
Terminal fretting or incorrectly seated connectors 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 extent of travel while using the scan tool to observe deployment type loop parameters.
If the pretensioner, passenger instrument panel 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 |
| • | Seat side air bag |
| • | Roof rail air bag |
| • | SDM |
| • | Seat belt retractor pretensioner wiring harness connector |
| • | Passenger instrument panel air bag wiring harness connector |
| • | Seat side air bag wiring harness connector |
| • | Roof rail air bag 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.
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.| • | F105 Passenger instrument panel air bag |
| • | Any inline harness connector |
| • | 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 X1 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
| • | X203 control circuit terminal 1 |
| • | X203 control circuit terminal 2 |
If 11 V or greater
| 4.1. | Ignition OFF. Disconnect the X1 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
| • | X203 control circuit terminal 1 |
| • | X203 control circuit terminal 2 |
If 25 Ω or less
| 5.1. | Disconnect the X1 harness connector at the K36 SDM. |
| 5.2. | 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 X1 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
| • | F105 Passenger instrument panel air bag control circuit terminal 1 X1 |
| • | F105 Passenger instrument panel air bag control circuit terminal 2 X1 |
If 11 V or greater
Repair the short to voltage on the circuit.
If less than 11 V
| • | F105 Passenger instrument panel air bag control circuit terminal 1 X1 |
| • | F105 Passenger instrument panel air bag control circuit terminal 2 X1 |
If 25 Ω or less
Repair the short to ground on the circuit.
If greater than 25 Ω
If greater than 2 Ω
Repair the open/high resistance in the circuit between the F105 passenger instrument panel air bag connector and the X203 inline harness connector.
If less than 2 Ω
Perform the Diagnostic Repair Verification after completing the repair.
| • | Control Module References for SDM replacement, programming and setup |
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