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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Tracker - 2WD 🢒 Restraints 🢒 SIR 🢒 DTC B1024 Driver Deployment Loop Voltage Out of Range

Object Number: 487037 Size: SF
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Handling ESD Sensitive Parts Notice

Circuit Description

When you first turn the ignition switch to the ON position, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. Then the SDM performs the following continuous diagnostic tests on the deployment loops:

    • Deployment loop voltage out of range test
    • Deployment loop resistance measurement test

If the voltage out of range test detects a short to voltage condition, the resistance measurement test for that deployment loop will not be performed.

Conditions for Setting the DTC
    • Deployment loop voltage out of range test.
       - Ignition 1 voltage is within the normal operating voltage range.
       - Driver frontal high terminal A6 is more than 6 volts for 500 milliseconds.
    • Deployment loop resistance measurement test.
       - Ignition 1 voltage is within the normal operating voltage range.
       - Driver frontal deployment loop is not shorted to voltage.
       - Driver frontal high terminal A6 is less than 2 volts AND driver frontal deployment loop resistance is less than 4.5 ohms for 500 milliseconds.

The driver frontal deployment loop consists of the following components:

    • Inflatable restraint steering wheel module.
    • Inflatable restraint steering wheel module coil.
    • Harness wiring of the driver frontal high circuit.
    • Harness wiring of the driver frontal low circuit.
    • Connector terminal contact.

Action Taken When the DTC Sets
    • The SDM sets a DTC B1024.
    • The SDM turns ON the AIR BAG warning indicator.

Conditions for Clearing the DTC
    • Current DTC
       - Deployment loop voltage out of range test-driver frontal high terminal A6 is 6 volts or less for 500 milliseconds.
       - Deployment loop resistance measurement test-driver frontal high terminal A6 is 2 volts or more AND driver frontal deployment loop resistance is less than 4.5 ohms for 500 milliseconds.
    • History DTC
       - Issue a scan tool CLEAR CODES command.
       - Once 250 malfunction free ignition cycles have occurred.

Diagnostic Aids

A short to B+ or short to ground in the inflatable restraint steering wheel module circuit can cause an intermittent condition. Inspect the driver frontal high circuit and the driver frontal low circuit carefully for cutting or chafing. Wiring pigtail damage requires replacement of the inflatable restraint steering wheel module coil.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. This step checks the inflatable restraint steering wheel module yellow 2-way connector.

    2.

  2. This step determines if the inflatable restraint steering wheel module coil or the inflatable restraint steering wheel module is malfunctioning.

    3.

  3. This step checks to see if there is a short to ground in the driver frontal high circuit.

    4.

  4. This step checks to see if there is a short to ground in the driver frontal low circuit.

    5.

  5. This step checks to see if there is a short to B+ in the driver frontal high circuit.

    6.

  6. This step determines if there is a short to B+ in the driver frontal low circuit or if there is a malfunctioning SDM.

    7.

  7. This step clears all SIR DTCs.

DTC B1024 Driver Frontal Deployment Loop Voltage Out Of Range

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. Disconnect the inflatable restraint steering wheel module yellow 2-way connector.
  3. Inspect the wiring harness side of the inflatable restraint steering wheel module yellow 2-way connector for corrosion or damaged terminals.

Are the inflatable restraint steering wheel module yellow 2-way connector and terminals free from damage and corrosion?

--

Go to Step 4

Go to Step 3

3

Repair or replace the wiring harness side of the inflatable restraint steering wheel module yellow 2-way connector. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

4
  1. Reconnect the inflatable restraint steering wheel module yellow 2-way connector.
  2. Make sure that the connector position assurance (CPA) is properly installed.
  3. Turn the ignition switch to the ON position.
  4. Use the scan tool to request the SIR DTC display.

Is DTC B1024 current?

--

Go to Step 5

Go to Diagnostic Aids

5
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the inflatable restraint IP module yellow 2-way connector and the inflatable restraint steering wheel module yellow 2-way connector.
  3. Install the J 38715-A SIR Driver/Passenger Load Tool to the wiring harness side of the inflatable restraint IP module yellow 2-way connector and the inflatable restraint steering wheel module yellow 2-way connector. Use the J 38715-25 adaptor for the inflatable restraint steering wheel module yellow 2-way connector and the J 38715-15 adaptor for the inflatable restraint IP module yellow 2-way connector.
  4. Turn the ignition switch to the ON position.
  5. Use the scan tool to request the SIR DTC display.

Is DTC B1024 current?

--

Go to Step 9

Go to Step 6

6

  1. Turn the ignition switch to the OFF position.
  2. Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
  3. Disconnect the J 38715-A from the inflatable restraint steering wheel module yellow 2-way connector.
  4. Connect the inflatable restraint steering wheel module yellow 2-way connector back together.
  5. Connect the J 38715-A to the upper inflatable restraint steering wheel module coil connector on the steering column. Use the J 38715-30 adaptor for the upper coil connector.
  6. Turn the ignition switch to the ON position.
  7. Use the scan tool to request the SIR DTC display.

Is DTC B1024 current?

--

Go to Step 8

Go to Step 7

7
  1. Turn the ignition switch to the OFF position.
  2. Replace the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .

Is the repair complete?

--

Go to Step 18

--

8
  1. Turn the ignition switch to the OFF position.
  2. Replace the inflatable restraint steering wheel module coil. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement .

Is the repair complete?

--

Go to Step 18

--

9

  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. Use the J 39200 Digital Multimeter (DMM) to measure the resistance between terminal A6 of the SDM wiring harness connector and a known good ground.

Is the measured resistance less than the specified value?

OL

Go to Step 10

Go to Step 11

10

Locate and repair a short to ground in the driver frontal high circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

11

Use the J 39200 to measure the resistance between terminal A7 of the SDM wiring harness connector and a known good ground.

Is the measured resistance less than the specified value?

OL

Go to Step 12

Go to Step 13

12

Locate and repair a short to ground in the driver frontal low circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

13

  1. Turn the ignition switch to the ON position.
  2. Use the J 39200 to measure the voltage between terminal A6 of the SDM wiring harness connector and a known good ground.

Is the measured voltage less than the specified value?

1 V

Go to Step 15

Go to Step 14

14

Locate and repair a short to B+ in the driver frontal high circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

15

Use the J 39200 to measure the voltage between terminal A7 of the SDM wiring harness connector and a known good ground.

Is the measured voltage less than the specified value?

1 V

Go to Step 17

Go to Step 16

16

Locate and repair a short to B+ in the driver frontal low circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

17

Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Is the repair complete?

--

Go to Step 18

--

18

  1. Reconnect all SIR components.
  2. Make sure that all components and connectors are properly mounted.
  3. Turn the ignition switch to the ON position.
  4. 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

--