B0018

CIRCUIT DESCRIPTION
The passenger deployment loop consists of a dual stage inflatable restraint IP module. The IP module high circuits, and the IP module low circuits exist for both stages 1 & 2. There are 2 shorting bars used within the IP module connector. These shorting bars short together the IP module stage 1 high circuits, and low circuits, and the IP module stage 2 high circuits and low circuits when the connector is disconnected. This prevents unwanted deployment of the inflator module during servicing. During a frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop. This flow of current will deploy the IP module. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity, and for shorts-to-ground or voltage. If a malfunction is detected, a DTC will be stored in memory.

CONDITIONS FOR RUNNING THE DTC
Ignition 1 voltage is within the normal operating voltage range.

CONDITIONS FOR SETTING THE DTC
^ DTC B0012 (stage 2) or B0016 (stage 1) will set when the IP module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
^ DTC B0013 (stage 2) or B0017 (stage 1) will set when one of the following conditions occurs:
- The IP module high circuit is less than 2.4 volts and the IP module deployment loop is more than 6 ohms for 500 milliseconds.
- The IP module deployment loop resistance is more than 4.8 ohms for 500 milliseconds.
^ DTC B0014 (stage 2) or B0018 (stage 1) will set when one of the following conditions occur:
^ The IP module high circuits and/or low circuits is short-to-ground, or short-to-voltage for 500 milliseconds.
^ The IP module high circuit is less than 2.4 volts and IP module deployment loop resistance is less than 6 ohms for 500 milliseconds.

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

CONDITIONS FOR CLEARING THE DTC
^ The condition responsible for setting the DTC is not currently present, and the scan tool Clear DTCs function is used.
^ A history DTC will clear once 255 malfunction-free ignition cycles have occurred

DIAGNOSTIC AIDS
The following are possible causes of the malfunction:
^ A short between the IP module stage 1 or stage 2, high and low circuits.
^ An open or a high resistance in the IP module stage 1 or stage 2, high or low circuits.
^ A short to ground or a short to voltage in the IP module stage 1 or stage 2, high or low circuits.
^ A malfunctioning IP module connector
^ A malfunctioning SDM connector
^ A malfunctioning IP module
^ A malfunctioning SDM

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-2:

Steps 3-9:

The numbers below refer to the step numbers on the diagnostic table.
4. Tests if the malfunction is caused by the IP module.
6. Determines which DTCs are present. If DTC B0012 or B0016 is present, test the IP module for a short between high circuits and low circuits in stage 1 or stage 2. If DTC B0013 or B0017 is present, test the IP module high circuits and low circuits for an open and for high resistance in stage 1 or stage 2. If DTC B0014 or B0018 is present, test the IP module high and low circuits for a short-to-ground, and for a short-to-voltage in stage 1 or stage 2.