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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon Denali 🢒 Restraints 🢒 SIR 🢒 DTC B1015 Passenger Deploy. Loop Resistance High

Object Number: 570828 Size: SF
SIR Components
SIR Schematics
SIR Handling Caution
SIR Schematic Icons
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) performs tests to diagnose critical malfunctions within itself. The SDM then measures the following circuits in order to verify that they are within their respective normal voltage ranges:

    • IGNITION 1 voltage
    • Deployment loop voltages

The SDM then proceeds with the Resistance Measurement test. During one portion of the Resistance Measurement test, the SDM performs the following:

    • Grounds the PASSENGER SIDE LOW terminal 4 through an internal current sink.
    • Connects the PASSENGER SIDE HIGH terminal 1 to an internal constant current source. This current produces proportional voltage drops in the deployment loop.
    • Measures the voltage difference between PASSENGER SIDE HIGH and PASSENGER SIDE LOW.
    • Calculates the resistance of the passenger deployment loop using the measured voltage.

Conditions for Setting the DTC
    • The driver and passenger deployment loops are not open.
    • The driver and passenger deployment loops are not shorted to voltage.
    • The passenger deployment loop is not shorted to ground.
    • The passenger deployment loop resistance is more than 3.0 ohms.

Action Taken When the DTC Sets

The SDM turns ON the AIR BAG warning lamp.

Conditions for Clearing the DTC
    • Current DTC
        The resistance of the passenger deployment loop is less than 3.0 ohms and the ignition switch is cycled.
    • History DTC
       - You issue a scan tool CLEAR CODES command.
       - After 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 may cause an intermittent condition. Inspect the following for a poor connection:

    • The inflatable restraint IP module harness connector terminals A and B
    • The SDM terminals 1 and 4
    • The wire to terminal connections in CKT 1403
    • The wire to terminal connections in CKT 1404

The diagnostic table directs the technician to note the entry value of PASSENGER RESISTANCE. Comparing the value of PASSENGER RESISTANCE over multiple ignition cycles may be helpful in determining if an intermittent condition exists.

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

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 inspects 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 IP module yellow 2-way connector.

    4.

  4. This test inspects for proper contact or corrosion of the inflatable restraint IP module jumper connector.

    5.

  5. This test determines whether the malfunction is due to the inflatable restraint IP module or the module jumper.

    6.

  6. This test inspects for proper contact or corrosion of the SDM connector.

    7.

  7. This test determines whether the malfunction is in CKT 1403.

    8.

  8. This test determines whether the malfunction is in CKT 1404.

DTC B1015 Passenger Deploy. Loop Resistance High

Step

Action

Value(s)

Yes

No

1

Was the SIR Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - SIR

2

  1. Turn the ignition switch to the OFF position.
  2. Connect the 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 passenger deployment loop resistance PASSENGER RESISTANCE.

Has the PASSENGER RESISTANCE 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 steering wheel and IP module yellow 2-way connectors near the base of the steering column.
  3. Inspect for proper connection at terminals A and B on the IP harness side of the inflatable restraint IP module yellow 2-way jumper connector.

Are the terminals damaged or corroded?

--

Go to Step 4

Go to Step 6

4

Replace the inflatable restraint IP module yellow 2-way IP harness connector. Refer to Connector Repairs .

Is the repair complete?

--

Go to Step 5

--

5

Inspect for proper connection at terminals A and B on the inflatable restraint IP module yellow 2-way jumper connector.

Are the terminals damaged or corroded?

--

Go to Step 7

Go to Step 28

6

Inspect for proper connection at terminals A and B on the inflatable restraint IP module yellow 2-way jumper connector.

Are the terminals damaged or corroded?

--

Go to Step 7

Go to Step 8

7

Repair the inflatable restraint IP module jumper harness. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Step 28

--

8
  1. Reconnect the yellow 2-way connectors near the base of the steering column.
  2. Turn the ignition switch to the RUN position.
  3. Using the Scan Tool , request the SIR data list display.
  4. Read the passenger deployment loop resistance PASSENGER RESISTANCE.

Is the passenger resistance more than the specified value?

3.0 ohms

Go to Step 10

Go to Step 9

9
  1. Turn the ignition switch to the OFF position.
  2. Replace the inflatable restraint IP module yellow 2-way IP harness connector. Refer to Connector Repairs .

Is the repair complete?

--

Go to Step 28

--

10

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the inflatable restraint steering wheel and IP module yellow 2-way connectors near the base of the steering column.
  3. Connect the J 38715-A SIR Driver/Passenger Load Tool to the connectors.
  4. Turn the ignition switch to the RUN position.
  5. Using the Scan Tool , request the data list display.
  6. Read the passenger deployment loop resistance PASSENGER RESISTANCE.

Is the passenger resistance more than the specified value?

3.0 ohms

Go to Step 19

Go to Step 11

11

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the inflatable restraint IP module pigtail connector at the module jumper.
  3. Inspect for proper connection at terminals A and B of the 2-way jumper connector.

Are the terminals damaged or corroded?

--

Go to Step 12

Go to Step 14

12

Repair the inflatable restraint IP module jumper harness. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Step 13

--

13

Inspect for proper connection at terminals A and B on the inflatable restraint IP module yellow 2-way pigtail connector.

Are the terminals damaged or corroded?

--

Go to Step 15

Go to Step 28

14

Inspect for proper connection at terminals A and B on the inflatable restraint IP module yellow 2-way pigtail connector.

Are the terminals damaged or corroded?

--

Go to Step 15

Go to Step 16

15

Replace the inflatable restraint IP module. Refer to Inflatable Restraint Instrument Panel Module Replacement .

Is the repair complete?

--

Go to Step 28

--

16

  1. Disconnect the inflatable restraint IP module jumper harness connector from the J 38715-A .
  2. Connect the connector to the jumper harness.
  3. Connect J 38715-A to the inflatable restraint IP module side of the jumper.
  4. Turn the ignition switch to the RUN position.
  5. Using the Scan Tool , request the SIR data list display.
  6. Read the passenger deployment loop resistance PASSENGER RESISTANCE.

Is the passenger resistance more than the specified value?

3.0 ohms

Go to Step 17

Go to Step 18

17
  1. Turn the ignition switch to the OFF position.
  2. Repair the high resistance condition in the inflatable restraint IP module jumper harness. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Step 28

--

18
  1. Turn the ignition switch to the OFF position.
  2. Replace the inflatable restraint IP module. Refer to Inflatable Restraint Instrument Panel Module Replacement .

Is the repair complete?

--

Go to Step 28

--

19

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  3. Disconnect the J 38715-A .
  4. Inspect for proper connection at terminals 1 and 4 on the SDM harness connector.

Is the harness connector damaged or corroded?

--

Go to Step 20

Go to Step 22

20

Replace the SDM harness connector. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Step 21

--

21

Inspect for proper connection at terminals 1 and 4 on the SDM.

Are the terminals damaged or corroded?

--

Go to Step 23

Go to Step 28

22

Inspect for proper connection at terminals 1 and 4 on the SDM.

Are the terminals damaged or corroded?

--

Go to Step 23

Go to Step 24

23

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

Is the repair complete?

--

Go to Step 28

--

24

  1. Zero the J 39200 Digital Multimeter.
  2. Measure the resistance from the SDM harness connector terminal 1 to the inflatable restraint IP module yellow 2-way harness connector terminal A.

Is the resistance reading within the specified values?

0-0.5 ohms

Go to Step 26

Go to Step 25

25

Repair the high resistance condition in CKT 1403.

Is the repair complete?

--

Go to Step 28

--

26

Measure the resistance from the SDM harness connector terminal 4 to the inflatable restraint IP module yellow 2-way harness connector terminal B.

Is the resistance reading within the specified values?

0-0.5 ohms

Go to Sensing and Diagnostic Module Integrity Check

Go to Step 27

27

Repair the high resistance condition in CKT 1404.

Is the repair complete?

--

Go to Step 28

--

28
  1. Reconnect all SIR system components.
  2. Verify that all components, connectors and CPAs are properly mounted.

Have all SIR components been reconnected and properly mounted?

--

Go to Step 29

--

29

Clear all SIR DTCs.

Have all SIR DTCs been cleared?

--

Go to Diagnostic System Check - SIR

--