Diagnostic Instructions
DTC Descriptors
DTC B1451 : Manual Cut-off Switch Malfunction
Circuit/System Description
When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself.
The SDM continuously checks the disable switch position switch and circuit defect by letting the regular voltage flow through the disable switch circuit and verifying the current.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
An open or short in wiring between SDM and disable switch.
Action Taken When the DTC Sets
The SDM commands the AIR BAG indicator ON.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Circuit/System Testing
Note: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
| • | The steering wheel coil module |
| • | The steering wheel coil module wiring harness connector |
| • | The SDM wiring harness connector |
- Ignition OFF, disconnect the passenger disable switch connector.
- Disconnect the SDM connector.
- Test for less than 1 ohm between terminal 60 of SDM and terminal 3 of disable switch.
| ⇒ | If resistance is not as specified, repair the open or high resistance in the circuit. |
- Connect the SDM connector.
- Ignition ON, check for 12.5 mA at terminal 3 of disable switch.
| ⇒ | If amperage is greater than specified, replace the disable switch. |
| ⇒ | If amperage is less than specified, replace the SDM. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
