Orlando

DTC B001A or B001B

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 appropriate seat belt anchor pretensioner. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage.

A shorting bar used within the seat belt anchor pretensioner connector will short together both seat belt anchor pretensioner high and low control circuits when the connector is disconnected; this will help to prevent unwanted deployment of the pretensioner during servicing.

Ignition voltage is between 9-16 V.

B001A 01, B001B 01

The seat belt anchor pretensioner control circuit is short circuited to voltage for 120 milliseconds.

B001A 02, B001B 02

The seat belt anchor pretensioner control circuit is short circuited to ground for 120 milliseconds.

B001A 04, B001B 04

The seat belt anchor pretensioner control circuit is open for 120 milliseconds.

B001A 0D, B001B 0D

The seat belt anchor pretensioner deployment loop resistance is more than 4.2 Ω for 120 milliseconds.

B001A 0E, B001B 0E

The seat belt anchor pretensioner deployment loop resistance is less than 1.7 Ω for 120 milliseconds.

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 that the shorting bars are not causing the circuits to be shorted together. Shorting bars locations are listed below:

Terminal fretting, an incorrectly installed CPA, or incorrectly seated connector can cause an open/high resistance condition. Check the circuit terminals for fretting, incorrectly installed CPAs, or incorrectly seated connectors if a DTC with symptom byte 04 or 0D is set.

If the seat belt anchor pretensioner has deployed 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

Refer to SIR Service Precautions

Note: 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.

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. Replace any CPA that is damaged or missing.

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:

•	F113 Seat belt anchor pretensioner

•	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

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. Replace any CPA that is damaged or missing.

1. Ignition OFF, disconnect the scan tool and then disconnect the harness connector at the appropriate F113 seat belt anchor pretensioner and then wait 120 seconds.
2. Test for greater than 25 Ω between the control circuit terminals listed below:

•	F113 Driver seat belt anchor pretensioner terminal 1 and 2

•	F113 Passenger seat belt anchor pretensioner terminal 1 and 2

⇒	If 25 Ω or less

2.1.	Disconnect the harness connector at the K36 SDM.

2.2.	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

3. Ignition ON.
4. Test for less than 11 V between the control circuit terminals listed below and ground:

•	F113 seat belt anchor pretensioner control circuit terminal 1

•	F113 seat belt anchor pretensioner control circuit terminal 2

⇒	If 11 V or greater

4.1.	Ignition OFF, disconnect the harness connector at the K36 SDM, ignition ON.

4.2.	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

5. Ignition OFF.
6. Test for greater than 25 Ω between the control circuit terminals listed below and ground:

•	F113 seat belt anchor pretensioner control circuit terminal 1

•	F113 seat belt anchor pretensioner control circuit terminal 2

⇒	If 25 Ω or less

6.1.	Disconnect the harness connector at the K36 SDM.

6.2.	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

7. Ignition OFF, install a 3 A fused jumper wire between the control circuit terminals listed below, ignition ON:

•	F113 Driver seat belt anchor pretensioner terminal 1 and 2

•	F113 Passenger seat belt anchor pretensioner terminal 1 and 2

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

⇒	If 2 Ω or greater

8.1.	Ignition OFF, disconnect the harness connector at the K36 SDM.

8.2.	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

9. Ignition OFF, connect the harness connector at the F113 seat belt anchor pretensioner, ignition ON.
10. Verify DTC B001A or B001B is not set.

⇒	If DTC B001A or B001B is set

Replace the F113 seat belt anchor pretensioner.

⇓	If DTC B001A or B001B is not set

11. All OK.

Perform the Diagnostic Repair Verification after completing the repair.