B0018

DTC B0018

Circuit Description
The passenger deployment loop consists of a dual stage inflatable restraint I/P module, the I/P module high and I/P module low circuits for both stages 1 & 2. There are 2 shorting bar used within the I/P module connector which will short together both I/P module stage 1 high and low circuits and both I/P module stage 2 high and low circuits when the connector is disconnected, this will help to prevent 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 in order to deploy the I/P 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 diagnostic trouble code (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 I/P 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:
- I/P module high circuit is less than 2.4 volts and the I/P module deployment loop is more than 6 ohms for 500 milliseconds.
- I/P 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:
- I/P module high and/or low circuits is short to ground or short to voltage for 500 milliseconds.
- I/P module high circuit is less than 2.4 volts and I/P 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 no longer exists 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 I/P module stage 1 or stage 2, high and low circuits.
^ An open or a high resistance in the I/P module stage 1 or stage 2, high or low circuits.
^ A short to ground or a short to voltage in the I/P module stage 1 or stage 2, high or low circuits.
^ The I/P module connector
^ The SDM connector
^ A malfunctioning I/P 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 Conditions and Poor Connections in Wiring Systems.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

4. Tests to see if the malfunction is caused by the I/P module.
6. Tests to see what DTCs are present. If DTC B0012 or B0016 is present, test the I/P module for a short between high and low circuits in stage 1 or stage 2. If DTC B0013 or B0017 is present, test the I/P module high 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 I/P module high and low circuits for a short to ground and for a short to voltage in stage 1 or stage 2.