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DTC B0019 or B0020

DTC B0019 or B0020

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

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

Diagnostic Fault Information

Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance
Passenger Instrument Panel Air Bag Stage 1 High Control B0019 02, B0019 0E B0019 0D B0019 04, B0019 0D B0019 01 -
Passenger Instrument Panel Air Bag Stage 1 Low Control B0019 02, B0019 0E B0019 0D B0019 04, B0019 0D B0019 01 -
Passenger Instrument Panel Air Bag Stage 2 High Control B0020 02, B0020 0E B0020 0D B0020 04, B0020 0D B0020 01 -
Passenger Instrument Panel Air Bag Stage 2 Low Control B0020 02, B0020 0E B0020 0D B0020 04, B0020 0D B0020 01 -


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 or pretensioner. 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 or pretensioner during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B0019 01, B0020 01

The air bag control circuit is shorted to voltage for 2 seconds.

B0019 02, B0020 02

The air bag control circuit is shorted to ground for 2 seconds.

B0019 04, B0020 04

The air bag control circuit is open for 2 seconds.

B0019 0D, B0020 0D

The air bag deployment loop resistance is greater than 4.2 Ω for 2 seconds.

B0019 0E, B0020 0E

The air bag deployment loop resistance is less than 1.4 Ω for 2 seconds.

Action Taken When the DTC Sets


• The SDM requests the instrument cluster to illuminate the 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 responsible for setting the DTC no longer exists.

• A history DTC will clear once 100 malfunction-free ignition cycles have occurred.


Diagnostic Aids

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

• 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 corrosion or incorrectly seated connector if a DTC with symptom byte 04 or 0D is set. DTCs of deployment loops which are in the seat 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.

If the pretensioner, passenger instrument panel air bags or side air bag has inflated under unexpected conditions and/or DTC with symptom byte 01 is set, check both control circuits for a short to voltage.

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


• Circuit Testing

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

• Connector Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Note

Refer to SIR Service Precautions .

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.

• Seat belt retractor pretensioner

• Passenger instrument panel air bag

• Side air bag

• Roof rail air bag

• SDM

• Seat belt retractor pretensioner wiring harness connector

• 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. The connector and connector position assurance (CPA) may seat independently 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 Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.



1. Verify the scan tool Deployment Loop Resistance 1 and 2 parameters stay consistently between 2.1 and 4.0 Ω without any spikes or dropouts while moving the harness near each connector listed below:

• F105 Passenger instrument panel air bag

• Any inline harness

• K36 SDM

• Inspect each connector terminal and harness for damage or corrosion and repair as necessary

• Apply Nyogel lubricant 760G to each connector terminal

• Insure each connector and CPA is correctly seated.

2. All OK


Circuit/System Testing


1. Ignition OFF.

2. Disconnect the scan tool.

3. Disconnect the harness connector X206.

4. Test for greater than 25 Ω between the appropriate control circuit terminals listed below on the SDM side of the connector:

• F105 Passenger instrument panel airbag stage 1 X206 terminal 1 and 2

• F105 Passenger instrument panel airbag stage 2 X206 terminal 4 and 5

4.1. Disconnect the harness connector at the K36 SDM.

4.2. Test for infinite resistance between the two control circuits.

5. Ignition ON.

6. Test for less than 11 V between the control circuit terminals listed below and ground:

• X206 control circuit terminal 1

• X206 control circuit terminal 2

• X206 control circuit terminal 4

• X206 control circuit terminal 5

6.1. Ignition OFF.

6.2. Disconnect the harness connector at the K36 SDM.

6.3. Ignition ON.

6.4. Test for less than 1 V between the control circuit and ground.

7. Test for greater than 25 Ω between the control circuit terminals listed below and ground:

• X206 control circuit terminal 1

• X206 control circuit terminal 2

• X206 control circuit terminal 4

• X206 control circuit terminal 5

7.1. Disconnect the harness connector at the K36 SDM.

7.2. Test for infinite resistance between the control circuit and ground.

8. Ignition OFF.

9. Install a 3 A fused jumper wire between the control circuit terminals listed below:

• F105 Passenger instrument panel airbag stage 1 X206 terminal 1 and 2

• F105 Passenger instrument panel airbag stage 2 X206 terminal 4 and 5

10. Ignition ON.

11. Verify the scan tool Deployment Loop Resistance parameter is less than 2 Ω.

11.1. Ignition OFF.

11.2. Disconnect the harness connector at the K36 SDM.

11.3. Test for less than 2 Ω in each control circuit end to end.

12. Ignition OFF.

13. Reconnect harness connector X206.

14. Disconnect the appropriate F105 Passenger instrument panel air bag harness connector X1 or X2.

15. Ignition ON.

16. Test for less than 11 V between the control circuit terminals listed below and ground:

• F105 Passenger instrument panel air bag control circuit terminal 1 X1

• F105 Passenger instrument panel air bag control circuit terminal 2 X1

• F105 Passenger instrument panel air bag control circuit terminal 1 X2

• F105 Passenger instrument panel air bag control circuit terminal 2 X2

17. Ignition OFF.

18. Test for greater than 25 Ω between the control circuit terminals listed below and ground:

• F105 Passenger instrument panel air bag control circuit terminal 1 X1

• F105 Passenger instrument panel air bag control circuit terminal 2 X1

• F105 Passenger instrument panel air bag control circuit terminal 1 X2

• F105 Passenger instrument panel air bag control circuit terminal 2 X2

19. Ignition OFF.

20. Test for less than 5 Ω between the control circuit terminals listed below:

• X206 control circuit terminal 1 and F105 Passenger Instrument Panel air bag harness connector control circuit terminal 1 X1

• X206 control circuit terminal 2 and F105 Passenger instrument panel air bag harness connector control circuit terminal 2 X1

• X206 control circuit terminal 4 and F105 Passenger instrument panel air bag harness connector control circuit terminal 1 X2

• X206 control circuit terminal 5 and F105 Passenger instrument panel air bag harness connector control circuit terminal 2 X2

21. Replace the F105 passenger instrument panel air bag.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Instrument Panel Inflatable Restraint Module Replacement

• SIR/SRS Wiring Repairs

• Control Module References for SDM replacement, programming and setup