• | 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 | Low Resistance | High Resistance | Open | Short to Voltage |
---|---|---|---|---|---|
Seat Belt Pretensioner - Driver - High Control | B0015 02 | B0015 0E | B0015 0D | B0015 04 | B0015 01 |
Seat Belt Pretensioner - Driver - Low Control | B0015 02 | B0015 0E | B0015 0D | B0015 04 | B0015 01 |
Left Front Roof Rail Module High Control | B0016 02 | B0016 0E | B0016 0D | B0016 04 | B0016 01 |
Left Front Roof Rail Module Low Control | B0016 02 | B0016 0E | B0016 0D | B0016 04 | B0016 01 |
I/P Module - Stage 1 - High Control | B0019 02 | B0019 0E | B0019 0D | B0019 04 | B0019 01 |
I/P Module - Stage 1 - Low Control | B0019 02 | B0019 0E | B0019 0D | B0019 04 | B0019 01 |
I/P Module - Stage 2 - High Control | B0020 02 | B0020 0E | B0020 0D | B0020 04 | B0020 01 |
I/P Module - Stage 2 - Low Control | B0020 02 | B0020 0E | B0020 0D | B0020 04 | B0020 01 |
Seat Belt Pretensioner - Passenger - High Control | B0022 02 | B0022 0E | B0022 0D | B0022 04 | B0022 01 |
Seat Belt Pretensioner - Passenger - Low Control | B0022 02 | B0022 0E | B0022 0D | B0022 04 | B0022 01 |
Right Front Roof Rail Module High Control | B0023 02 | B0023 0E | B0023 0D | B0023 04 | B0023 01 |
Right Front Roof Rail Module Low Control | B0023 02 | B0023 0E | B0023 0D | B0023 04 | B0023 01 |
Left Rear Roof Rail Module High Control | B0033 02 | B0033 0E | B0033 0D | B0033 04 | B0033 01 |
Left Rear Roof Rail Module Low Control | B0033 02 | B0033 0E | B0033 0D | B0033 04 | B0033 01 |
Right Rear Roof Rail Module High Control | B0040 02 | B0040 0E | B0040 0D | B0040 04 | B0040 01 |
Right Rear Roof Rail Module Low Control | B0040 02 | B0040 0E | B0040 0D | B0040 04 | B0040 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 air bag module. There are 2 shorting bars used within the module connector which will short together both high and low circuits, when the connector is disconnected. This will prevent unwanted deployment of the inflator module during servicing.
Ignition voltage is between 9-16 volts.
The air bag module high and/or low circuit is shorted to voltage for 120 milliseconds.
The air bag module high and/or low circuit is shorted to ground for 120 milliseconds.
The air bag module high and/or low circuit is open for 120 milliseconds.
The air bag module deployment loop resistance is greater than 3.9 ohms for 120 milliseconds.
The air bag module deployment loop resistance is less than 1.1 ohms for 120 milliseconds.
• | The SDM requests the instrument panel cluster (IPC) 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 fault-free ignition cycles have occurred. |
• | When a harness connector is disconnected, the high control and low control circuits are shorted together by the integral shorting bar. This should be taken into account when testing for faults on these circuits. |
• | This DTC usually indicates a poor connection or a wiring malfunction between the SDM and the deployment loop. |
SIR System Description and Operation
Control Module References for scan tool information
J 38715-A Driver and Passenger SIR Load Tool
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
• Pretensioner • Air bag module • SDM module • Air bag wiring harness connector • SDM wiring harness connector
⇒ | If the above condition is not found, make the appropriate repair. |
⇒ | If the DTC is not set or is set as history, cycle ignition OFF, disconnect the adapter and J 38715-A , reconnect the harness connector at the inflator restraint module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the inflator restraint module. |
• | I/P Module - Stage 1 terminal A1 |
• | I/P Module - Stage 2 terminal B1 |
• | Left Front Roof Rail Module terminal B |
• | Right Front Roof Rail Module terminal B |
• | Left Rear Roof Rail Module terminal 2 |
• | Right Rear Roof Rail Module terminal 2 |
• | Seat Belt Pretensioner - Left terminal B |
• | Seat Belt Pretensioner - Right terminal B |
⇒ | If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the SDM. |
• | I/P Module - Stage 1 terminal A2 |
• | I/P Module - Stage 2 terminal B2 |
• | Left Front Roof Rail Module terminal A |
• | Right Front Roof Rail Module terminal A |
• | Left Rear Roof Rail Module terminal 1 |
• | Right Rear Roof Rail Module terminal 1 |
• | Seat Belt Pretensioner - Left terminal A |
• | Seat Belt Pretensioner - Right terminal A |
⇒ | If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the SDM. |
• | I/P Module - Stage 1 terminal A1 |
• | I/P Module - Stage 2 terminal B1 |
• | Left Front Roof Rail Module terminal B |
• | Right Front Roof Rail Module terminal B |
• | Left Rear Roof Rail Module terminal 2 |
• | Right Rear Roof Rail Module terminal 2 |
• | Seat Belt Pretensioner - Left terminal B |
• | Seat Belt Pretensioner - Right terminal B |
⇒ | If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the SDM. |
• | I/P Module - Stage 1 terminal A2 |
• | I/P Module - Stage 2 terminal B2 |
• | Left Front Roof Rail Module terminal A |
• | Right Front Roof Rail Module terminal A |
• | Left Rear Roof Rail Module terminal 1 |
• | Right Rear Roof Rail Module terminal 1 |
• | Seat Belt Pretensioner - Left terminal A |
• | Seat Belt Pretensioner - Right terminal A |
⇒ | If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the SDM. |
• | I/P Module - Stage 1 terminal A1 and SDM terminal 10 |
• | I/P Module - Stage 2 terminal B1 and SDM terminal 6 |
• | Left Front Roof Rail Module terminal B and SDM terminal 13 |
• | Right Front Roof Rail Module terminal B and SDM terminal 14 |
• | Left Rear Roof Rail Module terminal 2 and SDM terminal 21 |
• | Right Rear Roof Rail Module terminal 2 and SDM terminal 22 |
• | Seat Belt Pretensioner - Left terminal B and SDM terminal 17 |
• | Seat Belt Pretensioner - Right terminal B and SDM terminal 18 |
⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
• | I/P Module - Stage 1 terminal A2 and SDM terminal 11 |
• | I/P Module - Stage 2 terminal B2 and SDM terminal 7 |
• | Left Front Roof Rail Module terminal A and SDM terminal 12 |
• | Right Front Roof Rail Module terminal A and SDM terminal 15 |
• | Left Rear Roof Rail Module terminal 1 and SDM terminal 20 |
• | Right Rear Roof Rail Module terminal 1 and SDM terminal 23 |
• | Seat Belt Pretensioner - Left terminal A and SDM terminal 16 |
• | Seat Belt Pretensioner - Right terminal A and SDM terminal 19 |
⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for SDM replacement, setup, and programming |