• | Perform the Diagnostic System Check - Vehicle prior to using the 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 | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Ignition 1 | B1370 06 | B1370 06 | B1370 01 | B1370 06 |
The inflatable restraint sensing and diagnostic module (SDM) monitors the ignition 1 signal from the ignition switch. When the vehicle ignition switch is placed in the RUN or CRANK position, the switch supplies voltage to the SDM ignition 1 input terminal. If an open, short to voltage, or short to ground in this SDM ignition 1 circuit is detected, then DTC B1370 will set.
Ignition voltage is between 9-16 volts.
The following conditions exist for at least 10 seconds.
The SDM detects a short to battery in the ignition 1 voltage circuit when the switch is in the OFF position.
The SDM detects a short to ground or an open in the ignition 1 voltage circuit when the ignition switch is in RUN or CRANK.
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
• | The SDM determines its power mode only from the GMLAN power mode messages and discards the ignition 1 input for the remainder of the ignition cycle. |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 255 malfunction-free ignition cycles have occurred. |
SIR System Description and Operation
Control Module References for scan tool information
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected.
• SDM • SDM wiring harness
⇒ | If greater then the specified range, test the circuit for an open/high resistance. |
⇒ | If less than the specified value, test the circuit for a short to ground. |
⇒ | If greater then the specified range, test the circuit for a short to voltage. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for SDM replacement, setup, and programming |