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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Venture 🢒 Restraints 🢒 SIR 🢒 DTC B1010 LH Side Air Bag Loop Resistance High

Object Number: 260335 Size: SF
SIR Components
SIR Schematics
Handling ESD Sensitive Parts Notice
SIR Caution
SIR Caution
Handling ESD Sensitive Parts Notice

Circuit Description

When you first turn the ignition switch to the RUN position, the inflatable restraint sensing and diagnostic module (SDM) perform tests to diagnose critical malfunctions within itself. Next the SDM measures the IGNITION and the deployment loop voltages to make sure they are within their respective normal voltage ranges. Then the SDM proceeds with the RESISTANCE MEASUREMENT test. During one portion of the RESISTANCE MEASUREMENT test, the SDM does the following:

    • Grounds the Driver Side Low terminal 10 through an internal current sink.
    • Connects the Driver Side High terminal 11 to an internal constant current source. This current produces proportional voltage drops in the deployment loop.
    • Measures the voltage difference between Driver Side High and Driver Side Low.
    • Calculates the resistance of the driver side air bag deployment loop using the measured voltage.

Conditions for Setting the DTC
    • The driver and passenger side air bag deployment loops are not open.
    • The driver and passenger side air bag deployment loops are not shorted to voltage.
    • The driver side air bag deployment loop is not shorted to ground.
    • The driver side air bag deployment loop resistance is more than 2.73 ohms. The driver side air bag deployment loop consists of the following components:
       - Inflatable restraint driver seat module.
       - Harness wiring of CKT 2138.
       - Harness wiring of CKT 2137.
       - Connector terminal contact.

The RESISTANCE MEASUREMENT test checks for this malfunction. This test only occurs once each ignition cycle when IGNITION is within the normal operating voltage range.

Action Taken When the DTC Sets
    • The SDM sets a Diagnostic Trouble Code.
    • The SDM turns ON the AIR BAG warning lamp.

Conditions for Clearing the DTC
    • Current DTC
        The resistance of the driver side air bag deployment loop is less than 2.38 ohms and the ignition switch is cycled.
    • History DTC
       - You issue a scan tool CLEAR CODES command.
       - Once 250 malfunction free ignition cycles have occurred.

When you issue a scan tool CLEAR CODES command and the malfunction is still present, the DTC will not reappear until the next ignition cycle.

Diagnostic Aids

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

    • The inflatable restraint driver seat module harness connector terminals A and B.
    • The SDM terminals 10 and 11.
    • The wire to terminal connections in CKT 2138.
    • The wire to terminal connections in CKT 2137.

The diagnostic table directs the technician to note the entry value of LH SIDE AIR BAG RESIST. Comparing the value of LH SIDE AIR BAG RESIST. over multiple ignition cycles can be helpful in determining if an intermittent condition exists.

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 test determines the deployment loop resistance measured by the inflatable restraint sensing and diagnostic module (SDM).

    2.

  2. This test checks for proper contact or corrosion of the yellow 2-way connector.

    3.

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

    4.

  4. This test checks for proper contact or corrosion of the SDM connector.

    5.

  5. This test determines whether the malfunction is in CKT 2138.

    6.

  6. This test determines whether the malfunction is in CKT 2137.

DTC B1010 LH Side Air Bag Loop Resistance High

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. Connect a scan tool to the DLC.
  3. Turn the ignition switch to the RUN position.
  4. Request the SIR data list display.
  5. Read and record on the repair order the driver side air bag deployment loop resistance LH SIDE AIR BAG RESIST.

Has LH SIDE AIR BAG RESIST. 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 buckle side belt yellow 2-way connectors located under the driver front seat.
  3. Check for proper connection at terminals A and B on the body harness side of the inflatable restraint front side impact module (LH) yellow 2-way connector (the smaller of the two yellow 2-way body harness connectors).

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 body harness connector. Refer to Wiring Repair .

Are the repairs complete?

--

Go to Step 5

--

5

Check for proper connection at terminals A and B on 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 proper connection at terminals A and B on 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 replacement complete?

--

Go to Step 21

--

8
  1. Reconnect the inflatable restraint front side impact module (LH) and driver seat buckle side belt yellow 2-way connectors located under the driver front seat.
  2. Turn the ignition switch to the RUN position.
  3. Using the scan tool, request the SIR data list display.
  4. Read the driver side air bag deployment loop resistance LH SIDE AIR BAG RESIST.

Is LH SIDE AIR BAG RESIST. more than the specified value?

2.8 ohms

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 body harness connector. Refer to Wiring Repair .

Are the repairs 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 buckle side belt yellow 2-way connectors located under the driver front seat.
  3. Connect the J 38715-A SIR Driver/Passenger Load Tool STEERING COLUMN and PASSENGER INFLATOR yellow 2-way connectors to the harness connectors.
  4. Turn the ignition switch to the RUN position.
  5. Using the scan tool, request the data list display.
  6. Read the driver side air bag deployment loop resistance LH SIDE AIR BAG RESIST.

Is LH SIDE AIR BAG RESIST. more than the specified value?

2.8 ohms

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 replacement 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).
  3. Disconnect the J 38715-A .
  4. Check for proper connection at terminals 10 and 11 on the SDM harness connector.

Is the harness connector damaged or corroded?

--

Go to Step 13

Go to Step 15

13

Replace the SDM connector. Refer to Wiring Repair .

Are the repairs complete?

--

Go to Step 14

--

14

Check for proper connection at terminals 10 and 11 on the SDM.

Are the terminals damaged or corroded?

--

Go to Step 16

Go to Step 21

15

Check for proper connection at terminals 10 and 11 on the SDM.

Are the terminals damaged or corroded?

--

Go to Step 16

Go to Step 17

16

Replace the inflatable restraint Sensing and Diagnostic Module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Are the repairs complete?

--

Go to Step 21

--

17

  1. Insert the J 42113 SIR shorting bar tool into the SDM harness connector above terminals 10 and 11.
  2. Zero the J 39200 Digital Multimeter.
  3. Measure the resistance from the SDM harness connector terminal 10 to the inflatable restraint front side impact module (LH) yellow 2-way harness connector terminal A.

Is the resistance reading within the specified values?

0-0.5 ohms

Go to Step 19

Go to Step 18

18

Repair the high resistance condition in CKT 2138.

Are the repairs complete?

--

Go to Step 21

--

19

  1. Zero the J 39200 .
  2. Measure the resistance from the SDM harness connector terminal 11 to the inflatable restraint front side impact module (LH) yellow 2-way harness connector terminal B.

Is the resistance reading within the specified values?

0-0.5 ohms

Go to Integrity Check

Go to Step 20

20

Repair the high resistance condition in CKT 2137.

Are the repairs complete?

--

Go to Step 21

--

21

Reconnect all the SIR components, make sure all the components are properly mounted.

Have all the SIR components been reconnected and properly mounted?

--

Go to Step 22

--

22

Clear all the SIR DTCs.

Have all the DTCs been cleared?

--

Go to SIR Diagnostic System Check

--