DTC B1012 LH Side Air Bag Loop Open. Opel Sintra 1999

For 1990-2009 cars
SIR Components
SIR Schematics
Handling ESD Sensitive Parts Notice
SIR Caution

### Circuit Description

When you first turn the ignition switch to the RUN position, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. Next the SDM measures IGNITION voltage to make sure it is within its respective normal voltage range. Then the SDM proceeds with the DEPLOYMENT LOOP CONTINUITY test. During the DEPLOYMENT LOOP CONTINUITY test, the SDM measures the voltage difference between Driver Side High and Driver Side Low.

### Conditions for Setting the DTC

• | The driver side air bag deployment loop resistance is more than 500 ohms.

• | The malfunction must be present for at least 500 milliseconds during one of the following tests:

- | DEPLOYMENT LOOP CONTINUITY

- | If the malfunction is detected in this test, the RESISTANCE MEASUREMENT test will not be performed.

- | CONTINUOUS MONITORING

### Action Taken When the DTC Sets

• | The SDM sets a DTC B1012.

• | The SDM turns ON the AIR BAG warning lamp.

### Conditions for Clearing the DTC

• | Current DTC

| The driver side air bag deployment loop resistance is less than 100 ohms for 500 milliseconds.

• | History DTC

- | You issue a scan tool CLEAR CODES command.

- | Once 250 malfunction free ignition cycles have occurred.

### Diagnostic Aids

A poor connection can cause an intermittent condition. Check the following for a poor connection:

• | The inflatable restraint driver seat module wiring harness connector terminal A and terminal B.

• | The SDM wiring harness connector terminal 10 and terminal 11.

• | An open in CKT 2137.

• | An open in CKT 2138.

When measurements are requested in this table, use J 39200 Digital Multimeter with the correct terminal adapter from J 35616 Connector Test Adapter Kit. When a check for proper connection is requested, refer to Intermittents and Poor Connections . When a wire, connector or terminal repair is requested, use J-38125 Terminal Repair Kit and refer to Wiring Repair .

### Test Description

The numbers below refer to the step numbers on the diagnostic table:

1. This step checks the inflatable restraint front side impact module (LH) yellow 2-way wiring harness connector for corrosion or damaged terminals.

2. This step isolates the malfunction to one side of the inflatable restraint front side impact module (LH) yellow 2-way connector.

3. This step checks the SDM wiring harness connector for corrosion or damaged terminals.

4. This step checks to see if there is an open in CKT 2138.

5. This step determines if there is an open in CKT 2137 or if there is a malfunctioning SDM.

#### DTC B1012 Driver Side Air Bag Deployment Loop Open

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the SIR Diagnostic System Check performed? | -- | Go to Step 2 | Go to SIR Diagnostic System Check

2

1. Turn the ignition switch to the OFF position.
2. Install the scan tool.
3. Turn the ignition switch to the RUN position.
4. Use the scan tool to request the SIR data list display.
5. Read and record on the repair order the driver side air bag deployment loop voltage difference LH SIDE AIR BAG VDIF.

Has LH SIDE AIR BAG VDIF been read and recorded on the repair order?

--

Go to Step 3

--

3

1. Turn the ignition switch to the OFF position.
2. Disconnect the inflatable restraint front side impact module (LH) and driver seat belt pretensioner yellow 2-way connectors.
3. Check for a proper connection at terminal A and terminal B on the wiring harness side of the inflatable restraint front side impact module (LH) yellow 2-way connector.

Are the terminals damaged or corroded?

--

Go to Step 4

Go to Step 6

4 | Replace the inflatable restraint front side impact module (LH) yellow 2-way wiring harness connector. Refer to Wiring Repair . Is the repair complete? | -- | Go to Step 5 | --
5 | Check for a proper connection at terminal A and terminal B of the inflatable restraint front side impact module (LH) yellow 2-way connector. Are the terminals damaged or corroded? | -- | Go to Step 7 | Go to Step 21
6 | Check for a proper connection at terminal A and terminal B of the inflatable restraint front side impact module (LH) yellow 2-way connector. Are the terminals damaged or corroded? | -- | Go to Step 7 | Go to Step 8
7 | Replace the inflatable restraint front side impact module (LH). Refer to Driver and Passenger Seat Side Inflatable Restraint Module Replacement . Is the repair complete? | -- | Go to Step 21 | --

8

1. Reconnect the inflatable restraint front side impact module (LH) and driver seat belt pretensioner yellow 2-way connectors.
2. Turn the ignition switch to the RUN position.
3. Use the scan tool to request the SIR data list display.
4. Read the driver side air bag deployment loop voltage difference LH SIDE AIR BAG VDIF.

Is LH SIDE AIR BAG VDIF more than the specified value?

480 mV

Go to Step 10

Go to Step 9

9

1. Turn the ignition switch to the OFF position.
2. Replace the inflatable restraint front side impact module (LH) yellow 2-way wiring harness connector. Refer to Wiring Repair .

Is the repair complete?

--

Go to Step 21

--

10

1. Turn the ignition switch to the OFF position.
2. Disconnect the inflatable restraint front side impact module (LH) and driver seat belt pretensioner yellow 2-way connectors.
3. Connect the J 38715-A SIR Driver/Passenger Load Tool STEERING COLUMN and PASSENGER INFLATOR yellow 2-way connectors to the wiring harness connectors.
4. Turn the ignition switch to the RUN position.
5. Use the scan tool to request the SIR data list display.
6. Read the driver side air bag deployment loop voltage difference LH SIDE AIR BAG VDIF.

Is LH SIDE AIR BAG VDIF more than the specified value?

480 mV

Go to Step 12

Go to Step 11

11

1. Turn the ignition switch to the OFF position.
2. Replace the inflatable restraint front side impact module (LH). Refer to Driver and Passenger Seat Side Inflatable Restraint Module Replacement .

Is the repair complete?

--

Go to Step 21

--

12

1. Turn the ignition switch to the OFF position.
2. Disconnect the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
3. Disconnect the J 38715-A .
4. Check for a proper connection at terminal 10 and terminal 11 of the SDM wiring harness connector.

Is the SDM wiring harness connector damaged or corroded?

--

Go to Step 13

Go to Step 15

13 | Replace the SDM wiring harness connector. Refer to Wiring Repair . Is the repair complete? | -- | Go to Step 14 | --
14 | Check for a proper connection at terminal 10 and terminal 11 on the SDM. Are the terminals damaged or corroded? | -- | Go to Step 16 | Go to Step 21
15 | Check for a proper connection at terminal 10 and terminal 11 on the SDM. Are the terminals damaged or corroded? | -- | Go to Step 16 | Go to Step 17
16 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete? | -- | Go to Step 21 | --

17

1. Insert the J 42113 into the SDM wiring harness connector above terminal 10 and terminal 11.
2. Zero the J 39200 Digital Multimeter (DMM).
3. Use the J 39200 to measure the resistance between terminal 10 of the SDM wiring harness connector and terminal A of the inflatable restraint front side impact module (LH) yellow 2-way wiring harness connector.

Is the measured resistance within the specified value?

0-0.5 ohms

Go to Step 19

Go to Step 18

18

1. Locate an open in CKT 2138.
2. Repair the open in CKT 2138.

Is the repair complete?

--

Go to Step 21

--

19 | Use the J 39200 to measure the resistance between terminal 11 of the SDM wiring harness connector and terminal B of the inflatable restraint front side impact module (LH) yellow 2-way wiring harness connector. Is the measured resistance within the specified value? | 0-0.5 ohms | Go to Sensing and Diagnostic Module Integrity Check | Go to Step 20

20

1. Locate an open in CKT 2137.
2. Repair the open in CKT 2137.

Is the repair complete?

--

Go to Step 21

--

21 | Reconnect all the SIR components, making sure all the components are properly mounted. Have all the SIR components been reconnected and properly mounted? | -- | Go to Step 22 | --
22 | Use the scan tool to clear all current and history SIR DTCs. Have all current and history SIR DTCs been cleared? | -- | Go to SIR Diagnostic System Check | --