Diagnostic Instructions
DTC Descriptors
DTC B0012: Passenger Frontal Deployment Loop (Stage 2) Resistance Low
DTC B0013: Passenger Frontal Deployment Loop (Stage 2) Open
DTC B0014: Passenger Frontal Deployment Loop (Stage 2) Voltage Out of Range
DTC B0016: Passenger Frontal Deployment Loop (Stage 1) Resistance Low
DTC B0017: Passenger Frontal Deployment Loop (Stage 1) Open
DTC B0018: Passenger Frontal Deployment Loop (Stage 1) Voltage Out of Range
Diagnostic Fault Information
Circuit
| Short to Ground
| High Resistance
| Open
| Short to Voltage
| Signal Performance
|
I/P Module Stage 1 High
| B0018
| B0018
| B0017
| B0018
| B0016
|
I/P Module Stage 1 Low
| B0018
| B0018
| B0017
| B0018
| B0016
|
I/P Module Stage 2 High
| B0014
| B0014
| B0013
| B0014
| B0012
|
I/P Module Stage 2 Low
| B0014
| B0014
| B0013
| B0014
| B0012
|
Circuit/System Description
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 instrument panel (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. There are 2 shorting bars 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.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0012 Stage 2 or B0016 Stage 1
The I/P module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0013 Stage 2 or B0017 Stage 1
• | The I/P module stage 1 or stage 2 high circuit is less than 2.4 volts and the I/P module stage 1 or stage 2 deployment loop is more than 6 ohms for 500 milliseconds. |
• | The I/P module stage 1 or stage 2 deployment loop resistance is more than 4.8 ohms for 500 milliseconds. |
B0014 Stage 2 or B0018 Stage 1
• | The I/P module stage 1 or stage 2 high and/or low circuits is shorted to ground or short to voltage for 500 milliseconds. |
• | The I/P module stage 1 or stage 2 high circuit is less than 2.4 volts and I/P module stage 1 or stage 2 deployment loop resistance is less than 6 ohms for 500 milliseconds. |
Action Taken When the DTC Sets
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
• | The SIR will store a DTC, however if an event occurs the system will still allow deployments. |
Conditions for Clearing the DTC
• | The condition for setting the DTC no longer exists. |
• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Diagnostic Aids
If there is more than one DTC set diagnose the open DTC first.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information.
Special Tools
• | J 38715-A
Driver and Passenger SIR Load Tool |
• | J 38715-80 Load Tool Adaptor |
Circuit/System Testing
Important: When removing the connectors inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
• | I/P wiring harness connector |
• | SDM wiring harness connector |
Important: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector
allowing the deployment circuit to operate properly.
- Verify that the I/P module connector and the CPA are engaged.
⇒ | If the above condition is not found, make the appropriate repair. |
- Ignition OFF, disconnect harness connector at I/P inflatable restraint module.
- Use J 38715-80 to connect the
J 38715-A
in place of the inflatable restraint module. Use the PASSENGER INFLATOR and BASE of COLUMN connectors located on the load tool.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0012, B0013, B0014, B0016, B0017, or B0018 is current.
⇒ | If DTC B0012, B0013, B0014, B0016, B0017, or B0018 is not set or set as history, cycle ignition OFF, disconnect the adapter and
J 38715-A
, reconnect the harness connector at the I/P inflatable
restraint module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the I/P inflatable restraint module. |
- Ignition OFF, disconnect and remove the
J 38715-A
and adapter.
- Disconnect the SDM harness connector.
- Ignition ON, test for less than 1 volt between the appropriate high control circuit listed below and ground:
• | Stage 1 SDM terminal 6 |
• | Stage 2 SDM terminal 10 |
⇒ | If greater than the specified range, test the control circuit for a short to voltage. |
- Test for less than 1 volt between the appropriate low control circuit terminal listed below and ground:
• | Stage 1 SDM terminal 7 |
• | Stage SDM 2 terminal 11 |
⇒ | If greater than the specified range, test the control circuit for a short to voltage. |
- Ignition OFF, test for infinite resistance between the appropriate high control circuit terminal listed below and ground:
• | Stage 1 SDM terminal 6 |
• | Stage 2 SDM terminal 10 |
⇒ | If less than the specified value, test the control circuit for a short to ground. |
- Test for infinite resistance between the appropriate low control circuit terminal listed below and ground:
• | Stage 1 SDM terminal 7 |
• | Stage 2 SDM terminal 11 |
⇒ | If less than the specified value, test the control circuit for a short to ground. |
- Test for less then 1 ohm between the appropriate high control circuit terminals listed below:
• | Stage 1 SDM terminal 6 and the I/P module terminal A1 |
• | Stage 2 SDM terminal 10 and the I/P module B1 |
⇒ | If greater than the specified range, test the control circuit for an open/high resistance. |
- Test for less then 1 ohm between the appropriate low control circuit terminals listed below:
• | Stage 1 SDM terminal 7 and the I/P module terminal A2 |
• | Stage 2 SDM terminal 11 and the I/P module B2 |
⇒ | If greater than the specified range, test the control circuit for an open/high resistance. |
- If all circuits test normal, replace the SDM.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.