B0021
DTC B0014-B0045
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0014 01
- Driver Seat Side Air Bag Deployment Loop Short to Battery
DTC B0014 02
- Driver Seat Side Air Bag Deployment Loop Short to Ground
DTC B0014 04
- Driver Seat Side Air Bag Deployment Loop Open
DTC B0014 0D
- Driver Seat Side Air Bag Deployment Loop High Resistance
DTC B0014 0E
- Driver Seat Side Air Bag Deployment Loop Low Resistance
DTC B0016 01
- Left Roof Rail Air Bag Deployment Loop Short to Battery
DTC B0016 02
- Left Roof Rail Air Bag Deployment Loop Short to Ground
DTC B0016 04
- Left Roof Rail Air Bag Deployment Loop Open
DTC B0016 0D
- Left Roof Rail Air Bag Deployment Loop High Resistance
DTC B0016 0E
- Left Roof Rail Air Bag Deployment Loop Low Resistance
DTC B0019 01
- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Short to Battery
DTC B0019 02
- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Short to Ground
DTC B0019 04
- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Open
DTC B0019 0D
- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 High Resistance
DTC B0019 0E
- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Low Resistance
DTC B0020 01
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Short to Battery
DTC B0020 02
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Short to Ground
DTC B0020 04
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Open
DTC B0020 0D
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 High Resistance
DTC B0020 0E
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Low Resistance
DTC B0021 01
- Passenger Seat Side Air Bag Deployment Loop Short to Battery
DTC B0021 02
- Passenger Seat Side Air Bag Deployment Loop Short to Ground
DTC B0021 04
- Passenger Seat Side Air Bag Deployment Loop Open
DTC B0021 0D
- Passenger Seat Side Air Bag Deployment Loop High Resistance
DTC B0021 0E
- Passenger Seat Side Air Bag Deployment Loop Low Resistance
DTC B0023 01
- Right Roof Rail Air Bag Deployment Loop Short to Battery
DTC B0023 02
- Right Roof Rail Air Bag Deployment Loop Short to Ground
DTC B0023 04
- Right Roof Rail Air Bag Deployment Loop Open
DTC B0023 0D
- Right Roof Rail Air Bag Deployment Loop High Resistance
DTC B0023 0E
- Right Roof Rail Air Bag Deployment Loop Low Resistance
Diagnostic Fault Information
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 an air bag. There are 2 shorting bars which will short together control circuits, when the connector is disconnected. This will help to prevent unwanted deployment of the air bag during servicing.
Conditions for Running the DTC
Ignition voltage is between 9-16 V.
Conditions for Setting the DTC
B0014 01, B0016 01, B0019 01, B0020 01, B0021 01, B0023 01
The air bag control circuit is shorted to voltage for 2 seconds.
B0014 02, B0016 02, B0019 02, B0020 02, B0021 02, B0023 02
The air bag control circuit is shorted to ground for 2 seconds.
B0014 04, B0016 04, B0019 04, B0020 04, B0021 04, B0023 04
The air bag control circuit is open for 2 seconds.
B0014 0D, B0016 0D, B0019 0D, B0020 0D, B0021 0D, B0023 0D
The air bag deployment loop resistance is greater than 4.2 ohms for 2 seconds.
B0014 0E, B0016 0E, B0019 0E, B0020 0E, B0021 0E, B0023 0E
The air bag deployment loop resistance is less than 1.4 ohms for 2 seconds.
Action Taken When the DTC Sets
* The SDM requests the instrument cluster to illuminate the SIR system AIR BAG indicator.
* The SDM will store a DTC, however if an event occurs the system will still attempt 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 Aid
Note: The following diagnostic aids apply for both current and history DTCs.
An incorrectly installed CPA or incorrectly seated connector can cause a shorting bar to short both control circuits together. Check the connectors and CPAs if a DTC with symptom byte 02 or 0E is set, to ensure the shorting bars are not causing the circuits to be shorted together. Shorting bars are used in the locations listed below:
* Passenger instrument panel air bag
* Driver and passenger seat side air bags
* Left and right roof rail air bags
* Inline connectors - on the side of the harness connector
* Harness side of the SDM connector
Terminal fretting or incorrectly seated connectors can cause an open/high resistance condition. Check the circuit terminals for fretting or incorrectly seated connector if a DTC with symptom byte 04 or 0D is set. If DTCs of deployment loops which are in the seat DTC B0014 and B0021, can occur because of stress or damage to the harness due to seat movement. Move the seat to the full extend of travel while using the scan tool to observe deployment type loop parameters.
Reference Information
Schematic Reference
SIR Schematics [1][2]Air Bag Systems
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (MN5)
Description and Operation
SIR System Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
Note: Refer to SIR Service Precautions Technician Safety Information.
Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
* Passenger instrument panel air bag
* Seat side air bag
* Roof rail air bag
* SDM
* Passenger instrument panel air bag wiring harness connector
* Seat side air bag wiring harness connector
* Roof rail air bag wiring harness connector
* SDM wiring harness connector
Note: 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.
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease / lubricant (Nyogel
760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.
Observe the scan tool Deployment Loop Resistance parameters while moving the harness near each connector listed below. The reading should stay consistently between 1.7 and 4.2 ohms without any drop outs or spikes.
* F105 Passenger instrument panel air bag
* F105 Roof rail air bag
* F106 Seat Side air bag
* Any inline harness
* K36 SDM
If the reading is erratic while moving the harness, perform the following:
* Inspect each connector terminal for damage or corrosion and repair as necessary.
* Apply dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087) to each connector terminal.
* Insure each connector and CPA is correctly seated.
Circuit/System Testing
DTC B0014-B0018 or B0021-B0045
1. Ignition OFF, disconnect the scan tool and disconnect the harness connector at the appropriate F105 roof rail air bags, or F106 seat side air bags.
2. Wait for 120 seconds and then test for greater than 25 ohms between the appropriate control circuit terminals listed below.
* F105 Left roof rail air bag terminal A and B
* F105 Right roof rail air bag terminal A and B
* F106 Driver seat side air bag terminal A and B
* F106 Passenger seat side air bag terminal A and B
• If less than the specified range, test for a short between the control circuits, check each connector and CPA to ensure that the shorting bars are lifted. If the circuits and shorting bars tests normal, replace the K36 SDM.
3. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground:
* F105 or F106 air bag control circuit terminal A
* F105 or F106 air bag control circuit terminal B
• If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K36 SDM.
4. Ignition OFF, test for greater than 25 ohms between the control circuit terminals listed below and ground:
* F105 or F106 air bag control circuit terminal A
* F105 or F106 air bag control circuit terminal B
• If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the K36 SDM.
5. Install a 3 A fused jumper wire between the control circuit terminals listed below.
* F105 Left roof rail air bag terminal A and B
* F105 Right roof rail air bag terminal A and B
* F106 Driver seat side air bag terminal A and B
* F106 Passenger seat side air bag terminal A and B
6. Verify the scan tool Deployment Loop Resistance parameter is less than 2 ohms.
• If greater than the specified range, test both control circuits terminals for an open/high resistance. If the circuits test normal, replace the K36 SDM.
7. If all circuits test normal, replace the F105, F106 air bag.
DTC B0019-B0020
1. Ignition OFF, disconnect harness connector X262.
2. Disconnect the scan tool.
3. Wait for 120 seconds and then test for greater than 25 ohms between the appropriate control circuit terminals listed below on the SDM side of the connector:
* F105 Passenger instrument panel air bag stage 1 X262 terminal 1 and 2
* F105 Passenger instrument panel air bag stage 2 X262 terminal 3 and 4
• If less than the specified range, test for a short between the control circuits, check each connector and CPA to ensure that the shorting bars are lifted. If the circuits and shorting bars tests normal, replace the K36 SDM.
4. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground:
* X262 control circuit terminal 1
* X262 control circuit terminal 2
* X262 control circuit terminal 3
* X262 control circuit terminal 4
• If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K36 SDM.
5. Ignition OFF, test for greater than 25 ohms between the control circuit terminals listed below and ground:
* X262 control circuit terminal 1
* X262 control circuit terminal 2
* X262 control circuit terminal 3
* X262 control circuit terminal 4
• If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the K36 SDM.
6. Install a 3 A fused jumper wire between the control circuit terminals listed below.
* F105 Passenger instrument panel air bag stage 1 X262 terminal 1 and 2
* F105 Passenger instrument panel air bag stage 2 X262 terminal 3 and 4
7. Verify the scan tool Deployment Loop Resistance parameter is less than 2 ohms.
• If greater than the specified range, test both control circuits terminals for an open/high resistance. If the circuits test normal, replace the K36 SDM.
8. Ignition OFF, reconnect harness connector X262.
9. Disconnect the F105 airbag harness connectors X1 and X2.
10. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground:
* Passenger instrument panel air bag control circuit terminal A X1
* Passenger instrument panel air bag control circuit terminal B X1
* Passenger instrument panel air bag control circuit terminal A X2
* Passenger instrument panel air bag control circuit terminal B X2
• If greater than the specified range, test the control circuit for a short to voltage.
11. Ignition OFF, test for greater than 25 ohms between the control circuit terminals listed below and ground:
* Passenger instrument panel air bag control circuit terminal A X1
* Passenger instrument panel air bag control circuit terminal B X1
* Passenger instrument panel air bag control circuit terminal A X2
* Passenger instrument panel air bag control circuit terminal B X2
• If less than the specified range, test the control circuit for a short to ground.
12. Ignition OFF, test for less than 5 ohms between the control circuit terminals listed below:
* X262 control circuit terminal 2 and F105 passenger instrument panel air bag harness connector control circuit terminal A X1
* X262 control circuit terminal 1 and F105 passenger instrument panel air bag harness connector control circuit terminal B X1
* X262 control circuit terminal 4 and F105 passenger instrument panel air bag harness connector control circuit terminal A X2
* X262 control circuit terminal 3 and F105 passenger instrument panel air bag harness connector control circuit terminal B X2
• If greater than the specified range, test the control circuit for an open/high resistance.
13. If all circuits test normal, replace the F105 passenger instrument panel air bag.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs
* Driver or Passenger Seat Side Inflatable Restraint Module Replacement Driver or Passenger Seat Side Inflatable Restraint Module Replacement
* Instrument Panel Inflatable Restraint Module Replacement Instrument Panel Inflatable Restraint Module Replacement
* Roof Side Rail Inflatable Restraint Module Replacement Roof Side Rail Inflatable Restraint Module Replacement
* Control Module References Programming and Relearning for SDM replacement, programming and setup