B0078

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Wiring Diagram:

CIRCUIT DESCRIPTION
The RF/passenger inflatable restraint Side Impact Sensor (SIS) deployment loop is a 2 wire circuit. When you first turn ON the ignition, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM provides input power to the SIS. When input power is first detected, the SIS responds by performing internal diagnostics. Next the SIS sends an ID message to the SDM. The SDM will consider this to be a valid ID if the response time is less than 5 seconds after the SIS is powered up.The SIS will continually communicate a status message to the SDM. The SDM can reset the SIS by removing and applying power to it.

CONDITIONS FOR RUNNING THE DTC
^ Ignition 1 voltage is within the normal operating voltage range.
^ RF SIS loop is not shorted to voltage.
^ RF SIS loop is not shorted to ground.
The SDM monitors the inflatable restraint Side Impact Sensor (SIS) loop with the power on.

CONDITIONS FOR SETTING THE DTC
^ The SDM has detected one of the following conditions due to a fault in the SIS interface circuit:
- A valid ID message is not received within 5 seconds of the SIS being powered up.
- Status message is not received.
^ The SDM has failed twice to reset the SIS.

ACTION TAKEN WHEN THE DTC SETS
The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.

CONDITIONS FOR CLEARING THE DTC
^ The SDM has detected correct operation.
^ The SIS sends a OK message to the SDM.
^ You can issue a CLEAR CODES command
^ A history DTC will clear once 255 malfunction free ignition cycles have occurred

DIAGNOSTIC AIDS
The following can cause an intermittent condition in the inflatable restraint Side Impact Sensor (SIS) circuit:
^ A short to ground or short to voltage.
^ High resistance or low resistance.
^ Inspect the inflatable restraint side impact sensor high and sensor low circuits carefully for cutting and/or chafing
^ Refer to Intermittents and Poor Connections in Diagrams.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks the inflatable restraint sensing and diagnostic module (SDM) connector.
3. This step checks the resistance between the RF SIS side sensor circuit and the RF SIS side sensor return circuit.
4. This test checks the RF SIS side sensor circuit for a short to voltage.
5. This step checks the RF SIS side sensor return circuit for a short to voltage.
6. This step checks the RF SIS side sensor return circuit for a short to ground.
7. This step checks the RF SIS side sensor circuit for a short to ground.
10. This step checks for an open in the RF SIS sensor circuit.
11. This step checks for an open in the RF SIS sensor return circuit.