DTC 66

Circuit Description
When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform tests to diagnose critical malfunctions within itself. Upon passing these tests, Ignition 1 and deployment loop voltages are measured to ensure that they are within their respective normal voltage ranges. The SDM monitors the voltages at the right side belt pretensioner low terminal (terminal B3) and the left side belt pretensioner low terminal (terminal B2) to detect shorts to ground or voltage in the deployment loops.

DTC 66 Will Set When
Diagnostic trouble code (DTC) 66 will be set if the voltage at the left side belt pretensioner low terminal falls below or above a specified value and Ignition 1 is within the normal operating voltage range.

This test is run during turn-on tests and every 100 milliseconds during continuous monitoring.

Action Taken
The SDM will turn on the AIRBAG indicator and set a DTC 66.

DTC 66 Will Clear When
The malfunction is no longer occurring (has been repaired) and the SDM has been replaced. DTC 66 cannot be cleared with the scan tool.

Diagnostic Aids
Carefully inspect the wires in the left side belt pretensioner loop for cutting or chafing. If the wiring pigtail of the left side belt pretensioner is damaged, the left side belt pretensioner module must be replaced.

Test Description
The number(s) below refer to step(s) on the diagnostic table.

3. See the first caution below.
4. See the first caution below.
5. See the second caution below.

Steps 1 - 5:

Steps 6 - 8:

DTC 66 - Left Side Belt Pretensioner Loop Short to Ground/Voltage

CAUTION: The SDM can maintain sufficient voltage to deploy the airbags for 10 minutes after the ignition is OFF and the fuse has been removed. If the air - bags are not disconnected, service cannot begin until 10 minutes have passed after disconnecting power to the SDM.

CAUTION: During service procedures, be very careful when handling the SDM. Never strike or jar the SDM. Never power up the SIR system when the SDM is not rigidly attached to the vehicle. All SDM mounting bolts must be carefully tightened, and the SDM arrow must be pointing toward the front of the vehicle to ensure proper operation of the SIR system. The SDM could be activated if it is powered when it is not rigidly attached to the vehicle, resulting in unexpected deployment and possible injury.

Important: A careful inspection of the circuits and components indicated on the DTC 66 chart is essential to ensure that the replacement SDM will not be damaged. When DTC 66 has been set, it is necessary to replace the SDM.