SAAB WIS ONLINE

DTC B0016, B0018, B0023, or B0025

DTC B0016, B0018, B0023, or B0025

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 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 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 Short to Ground High Resistance Open Short to Voltage Signal Performance
Left Roof Rail Air Bag High Control B0016 02, B0016 0E B0016 0D B0016 04, B0016 0D B0016 01 -
Left Roof Rail Air Bag Low Control B0016 02, B0016 0E B0016 0D B0016 04, B0016 0D B0016 01 -
Right Roof Rail Air Bag High Control B0023 02, B0023 0E B0023 0D B0023 04, B0023 0D B0023 01 -
Right Roof Rail Air Bag Low Control B0023 02, B0023 0E B0023 0D B0023 04, B0023 0D B0023 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

B0016 01, B0023 01

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

B0016 02, B0023 02

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

B0016 04, B0023 04

The air bag control circuit is open for 2 seconds.

B0016 0D, B0023 0D

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

B0016 0E, B0023 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

Driver and passenger side air bags

Left and right roof rail air bags

Driver and passenger retractor pretensioners

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:

F105L Roof rail air bag - left

F105R Roof rail air bag - right

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 appropriate harness connector listed below:

F105L Roof rail air bag - left

F105R Roof rail air bag - right

4. Wait for 120 seconds.

5. Test for greater than 25 Ω between the control circuit terminals 1 and 2.

5.1. Disconnect the harness connector at the K36 SDM.

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

6. Ignition ON.

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

Control circuit terminal 1

Control circuit terminal 2

7.1. Ignition OFF.

7.2. Disconnect the harness connector at the K36 SDM.

7.3. Ignition ON.

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

8. Ignition OFF.

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

Control circuit terminal 1

Control circuit terminal 2

9.1. Disconnect the harness connector at the K36 SDM.

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

10. Ignition OFF.

11. Install a 3 A fused jumper wire between the appropriate control circuit terminals 1 and 2.

12. Ignition ON.

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

13.1. Ignition OFF.

13.2. Disconnect the harness connector at the K36 SDM.

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

14. Replace the appropriate F105L roof rail air bag - left or F015R roof rail air bag - right.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Roof Side Rail Inflatable Restraint Module Replacement

SIR/SRS Wiring Repairs

Control Module References for SDM replacement, programming and setup