Circuit Description
Battery positive voltage (B+) is supplied to the SDM when the ignition switch is in the ON position via CKT 1139. The SDM monitors this voltage to determine if it is within a valid operating range.
Conditions for Setting the DTC
The ignition positive voltage level falls below 9 volts for approximately 1.2 seconds or more.
Action Taken When the DTC Sets
| • | Stores a DTC B1327 in the SDM memory. |
| • | The SDM will not respond to any manual or memory inputs when the voltage is less than 9 volts |
| • | No driver warning message will be displayed for this DTC. |
Conditions for Clearing the DTC
| • | The ignition positive voltage (B+) level rises above 9.5 volts for approximately 1.2 seconds. |
| • | Use the On-Boards clearing DTCs feature. |
| • | Use a scan tool. |
Diagnostic Aids
The SDM will not check for low ignition positive voltage during and for 2 seconds following the engine START mode. This ensures that DTC B1327 will not erroneously set.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
Perform the entire SIR Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Checks that DTC was not set erroneously.
-
Determines whether the malfunction is in the charging system or the SDM.
-
Clear all DTCs after the repair procedure is complete.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the SIR Diagnostic System Check performed? | -- | |||
Is Ignition 1 greater than the specified value? | 9 V | |||
Is the voltage less than the specified value? | 9 V | Go to Charging System Check in Engine Electrical | ||
4 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the SDM replacement complete? | -- | -- | |
Are all DTCs cleared? | -- | -- |
