Diagnostic Instructions
DTC Descriptors
DTC B1370 06: Device Ignition 1 Circuit Short to Ground or Open
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) monitors the ignition 1 voltage circuit from the IGN MAIN PCB relay. The SDM also compares the ignition 1 voltage input to the power mode message communicated over the vehicle bus.
When the vehicle ignition switch is placed in the RUN or CRANK position, voltage is applied to the SDM ignition 1 voltage circuit. If a fault is detected in the SDM ignition 1 voltage circuit, then DTC B1370 will set.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
The following conditions exist for at least 10 seconds.
B1370 06
| • | 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 sees that the vehicle power mode message is Run/Crank but does not detect the Run/Crank voltage on the ignition 1 voltage input. |
| • | An open circuit on the in the run/crank relay coil control circuit of the IGN MAIN PCB relay. |
Action Taken When the DTC Sets
| • | The SDM stores DTC to memory. |
| • | The SDM determines its power mode only from the serial data power mode messages and ignores the ignition 1 input for the remainder of the ignition cycle. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
SIR Connector End Views
Electrical Information Reference
Circuit/System Testing
Important: Refer to
SIR Service Precautions
Important: When removing connectors inspect for damage, corrosion or poor connection. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
| • | The SDM wiring harness connector |
- Ignition OFF, disconnect the harness connector at the SDM.
- Connect a test lamp between the ignition 1 voltage circuit terminal 32 and ground.
- Ignition ON, the test lamp should illuminate.
| ⇒ | If the test lamp does not illuminate, test the ignition 1 voltage circuit an open/high resistance or short to ground. |
- If the circuits test normal, replace the SDM.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
