B1035

DTC B1035 Disc Sensor Circuit Closed or Short to Ground circuit:

Wiring Diagram:

CIRCUIT DESCRIPTION
When you turn the ignition switch to the ON position, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests in order to diagnose critical malfunctions. The SDM measures IGNITION 1 voltage, the 23-volt loop reserve, and the deployment loop voltages in order to verify the normal ranges. Next, the SDM proceeds to Continuous Monitoring. The SDM contains a network of resistors that is connected to 5 volts, to ground, and to the SDM sensor signal terminal 2. The 8.45k ohm resistor in the inflatable restraint forward discriminating sensor is parallel to the normally open switch, and provides a parallel path to ground. This causes a specified percentage of voltage to appear at the SDM sensor feed input. The SDM monitors this voltage in order to detect shorts to ground or a closed sensor.

CONDITIONS FOR SETTING THE DTC
^ The SDM has an inflatable restraint forward discriminating sensor.
^ The voltage at Sensor Feed terminal 2 is less than 0.5 volts for 500 milliseconds.

The Continuous Monitoring test checks for this DTC. This test occurs if IGNITION 1 is within the normal operating voltage range.

ACTION TAKEN WHEN THE DTC SETS
^ The SDM sets a diagnostic trouble code.
^ The SDM turns ON the AIR BAG warning lamp.

CONDITIONS FOR CLEARING THE DTC
^ Current DTC
The voltage at Sensor Feed terminal 2 is more than 0.5 volts for 500 milliseconds.
^ History DTC
- Use a scan tool in order to clear the DTC.
- 250 ignition cycles occur without a malfunction.

DIAGNOSTIC AIDS
A short to ground in the circuit of the inflatable restraint forward discriminating sensor can cause an intermittent condition. Carefully inspect the input circuit and the pigtail of the inflatable restraint forward discriminating sensor.

When this table requests measurements, use the J 39200 Digital Multimeter with the correct terminal adapter from the J 35616-A Connector Test Adapter Kit. If this table requests a check for a correct connection, refer to Testing for Intermittent and Poor Connections. If the table requests a wire repair, a connector repair, or a terminal repair, use the J 38125-B Terminal Repair Kit, and refer to Wiring Repair. Intermittents and Poor Connections

TEST DESCRIPTION

CAUTION: Be careful when you handle a sensor. Do not strike or bit a sensor. Before applying power to a sensor:
^ Remove any dirt, grease, etc. from the mounting surface.
^ Position the sensor horizontally on the mounting surface.
^ Point the arrow on the sensor toward the front of the vehicle.
^ Tighten all of the sensor fasteners and sensor bracket fasteners to the specified torque value.

Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

The numbers below refer to the step numbers on the diagnostic table.
2. This test checks for a malfunctioning discriminating sensor.
4. This test checks for a short to ground in the GRN wire.