B0016
DTC B0016
CIRCUIT DESCRIPTION
The passenger roof rail deployment loop consists of the following components:
- A inflatable restraint left roof rail module
- The roof rail module-left high circuit
- The roof rail module-left low circuit
A shorting bar used within the roof rail module connector which will short together both roof rail module-left high and low circuits when the connector is disconnected, this will help to prevent unwanted deployment of the inflator module during servicing. During a side or 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 roof side rail 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.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B0016 Left Roof Rail Deployment Loop
This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description
CONDITIONS FOR RUNNING THE DTC
Ignition voltage is within the normal operating voltage range.
CONDITIONS FOR SETTING THE DTC
B0016 01
The roof rail module-left high and/or low circuit is short to voltage for 120 milliseconds.
B0016 02
The roof rail module-left high and/or low circuit is short to ground for 120 milliseconds.
B0016 04
The roof rail module-left high and/or low circuit is open for 120 milliseconds.
B0016 0D
The steering wheel module deployment loop resistance is more than 3.9 ohms for 120 milliseconds.
B0016 0E
The steering wheel module deployment loop resistance is less than 1.1 ohms for 120 milliseconds.
ACTION TAKEN WHEN THE DTC SETS
The SDM commands the AIR BAG indicator ON via GMLAN serial data.
CONDITIONS FOR CLEARING THE MIL/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 roof rail module-left high and low circuits
- An open or a high resistance in the roof rail module-left high or low circuits
- A short to ground or a short to voltage in the roof rail module-left high or low circuits
- The roof rail module-left connector
- The SDM connector
- A malfunctioning roof rail module-left
- 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 Diagnostic Aids for Circuit Testing and Wiring Repair procedures.
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 roof rail module-left.
6. This step tests to see what DTCs are present. If DTC B0016 01 is present, test the roof rail module-left for a short to battery voltage on the high and low circuits. If DTC B0016 02 is present, test the roof rail module-left for a short to ground on the high and low circuits. If DTC B0016 04, 0D, 0E is present, test the roof rail module-left test the high and low circuits for an open circuit and for high or low resistance.