Volt

DTC B0016, B0018, B0023, or B0025

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.

Ignition voltage is between 9-16 V.

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.

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:

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. DTCs of deployment loops which are in the seat DTC 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 seat 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.

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

Note: Refer to SIR Service Precautions .

Note: 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.

1. Verify the scan tool Deployment Loop Resistance 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

⇒	If less than 2.1 or greater than 4.0 Ω

Refer to Circuit/System Testing.

⇒	If there are spikes or dropouts, perform the following

•	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.

⇓	If within 2.1 and 4.0 Ω without any spikes or dropouts

2. All OK

1. Vehicle 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.

⇒	If 25 Ω or less

5.1.	Disconnect the X2 harness connector at the K36 SDM.

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

⇒	If less than infinite resistance, repair the short between the two circuits.

⇒	If infinite resistance, replace the K36 SDM.

⇓	If greater than 25 Ω

6. Vehicle in Service Mode.
7. Test for less than 11 V between the control circuit terminals listed below and ground:

•	Control circuit terminal 1

•	Control circuit terminal 2

⇒	If 11 V or greater

7.1.	Vehicle OFF.

7.2.	Disconnect the X2 harness connector at the K36 SDM.

7.3.	Vehicle in Service Mode.

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

⇒	If 1 V or greater, repair the short to voltage on the circuit.

⇒	If less than 1 V, replace the K36 SDM.

⇓	If less than 11 V

8. Vehicle 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

⇒	If 25 Ω or less

9.1.	Disconnect the X2 harness connector at the K36 SDM.

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

⇒	If less than infinite resistance, repair the short to ground on the circuit.

⇒	If infinite resistance, replace the K36 SDM.

⇓	If greater than 25 Ω

10. Vehicle OFF.
11. Install a 3 A fused jumper wire between the appropriate control circuit terminals 1 and 2.
12. Vehicle in Service Mode.
13. Verify the scan tool Deployment Loop Resistance parameter is less than 2 Ω.

⇒	If 2 Ω or greater

13.1.

Vehicle OFF.

13.2.

Disconnect the X2 harness connector at the K36 SDM.

13.3.

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

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, replace the K36 SDM.

⇓	If less than 2 Ω

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.