• | 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 | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Rollover Sensor Ignition | B3855 | B3855 | -- | -- |
Rollover Sensor Serial Data Link | B3855 | B3855 | B3855 | B3855 |
Rollover Sensor Ground | -- | B3855 | B3855 | -- |
The inflatable restraint vehicle rollover sensor utilizes battery power supply and a bidirectional interface circuit. The rollover sensor modulates current on the interface to send ID, State of Health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). When the ignition is turned on the rollover sensor responds by performing internal diagnostics and sending an ID to the SDM. The rollover sensor continually communicates status messages to the SDM, which determines if a fault is present in the rollover sensor circuit.
Ignition voltage is between 9-16 volts.
• | A valid ID message is not received within 5 seconds of the rollover sensor being powered up. |
• | A status message is not received. |
• | The SDM has received a NOK message from the rollover sensor. |
• | A ROS internal fault exists for a 127 ignition cycles. |
When the SDM has received an ID message from the rollover sensor that does not match the ID stored in the SDM memory.
The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
• | The DTC will clear when the condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 250 malfunction-free ignition cycles have occurred. |
SIR System Description and Operation
Control Module References for scan tool information
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
⇒ | If greater than the specified range, test the serial data circuit for a short to voltage. |
⇒ | If less than the specified value, test the serial data circuit for a short to ground. |
⇒ | If less than the specified value, test the serial data link for an open/high resistance. |
⇒ | If the DTC resets as current, replace the SDM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for SDM replacement, setup, and programming |