B0017

DTC B0017

CIRCUIT DESCRIPTION




The inflatable restraint instrument panel (I/P) module deployment loop consists of the inflatable restraint I/P module, and the I/P module high and low circuits. A shorting bar used within the I/P module connector shorts together the I/P module high and low circuits when the connector is disconnected. This helps 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) allows current to flow through the deployment loop in order to deploy the I/P module. When the ignition is turned ON, 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 B0016 will set when the I/P module deployment loop resistance is less than 1.3 ohms for 300 milliseconds.
- DTC B0017 will set when one of the following conditions occurs:
- I/P module high circuit is less than 2 volts and the I/P module deployment loop resistance is more than 3.7 ohms for 300 milliseconds.
- I/P module deployment loop resistance is more than 6 ohms for 300 milliseconds.
- DTC B0018 will set when one of the following conditions occur:
- I/P module high and/or low circuit is short to ground or short to voltage for 300 milliseconds.
- I/P module high circuit is less than 2 volts and I/P module deployment loop resistance is less than 6 ohms for 300 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 high and low circuits
- An open or a high resistance in the I/P module high or low circuits
- A short to ground or a short to voltage in the I/P module high or low circuits
- The I/P module in-line connector
- The I/P module pigtail 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.

TEST DESCRIPTION

Steps 1-9:

The numbers below refer to the step numbers on the diagnostic table.
4. This step tests to see if the malfunction is caused by the I/P module.
6. This step tests to see what DTCs are present. If DTC B0016 is present, test the I/P module for a short between high and low circuits. If DTC B0017 is present, test the I/P module high and low circuits for an open and for high resistance. If DTC B0018 is present, test the I/P module high and low circuits for a short to ground and for a short to voltage.