GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Regal 🢒 Restraints 🢒 SIR 🢒 DTC B0045 LF Side Deploy Loop Short to Ground/Voltage Out of Range

Object Number: 614270 Size: SF
SIR Component Views
Power, Ground, Side Air Bag Sensor, Driver Seat Module, IP Module, Steering Wheel Module and SDM
SIR Handling Caution
Handling ESD Sensitive Parts Notice

Circuit Description

When you first turn ON the ignition, 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 Running the DTC

Deployment loop voltage out of range - Ignition 1 voltage is within the normal operating voltage range.

Deployment loop resistance measurement test:

    • Ignition 1 voltage is within the normal operating voltage range.
    • Driver side deployment loop is not shorted to voltage.

Conditions for Setting the DTC

Deployment loop voltage out of range test - Driver side high terminal B1 of connector C2 is more than 6 volts for 300 milliseconds.

Deployment loop resistance measurement test - Driver side high terminal B1 of connector C2 is less than 2 volts AND driver side deployment loop resistance is less than 6 ohms for 300 milliseconds.

Action Taken When the DTC Sets

The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.

Conditions for Clearing the DTC
    • You can issue a CLEAR CODES command
    • A history DTC will clear once 255 malfunction free ignition cycles have occurred

Diagnostic Aids

A short to B+ or a short to ground in the inflatable restraint driver seat module deployment loop can cause an intermittent condition. Inspect the driver side high and driver side low circuits carefully for cutting or chafing. Wiring pigtail damage requires replacement of the inflatable restraint driver seat module.

Test Description

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

  1. This step checks the inflatable restraint driver seat module yellow 2-way connector.

    2.

  2. This step checks to see if there is a malfunctioning inflatable restraint driver seat module.

    3.

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

    4.

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

    5.

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

    6.

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

    7.

  7. This step clears all SIR and all communication DTCs.

DTC B0045 Driver Side Air Bag Deployment Loop Voltage Out Of Range

Step

Action

Value(s)

Yes

No

1

Did you perform the SIR Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - SIR

2

  1. Turn OFF the ignition.
  2. Disconnect the inflatable restraint driver seat module yellow 2-way connector located under the driver's seat.
  3. Inspect the male and female sides of the inflatable restraint driver seat module yellow 2-way connector for the following conditions:
    4. • Corrosion
    • Damaged terminals
    • Poor connections/terminal tension
  4. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Does either the male or female side of the inflatable restraint driver seat module yellow 2-way connector exhibit and signs or corrosion, terminal damage, or poor connections?

--

Go to Step 3

Go to Step 4

3
  1. If the female side of the inflatable restraint driver seat module yellow 2-way connector is damaged, the inflatable restraint driver seat module must be replaced.
  2. If the male side of the inflatable restraint driver seat module yellow 2-way connector is damaged, replace the male side of the connector. Refer to Connector Repairs in Wiring systems.

Did you complete the repair?

--

Go to Step 16

--

4
  1. Reconnect the inflatable restraint driver seat module yellow 2-way connector.
  2. Verify that the connector position assurance (CPA) is properly installed.
  3. Turn ON the ignition, with the engine OFF.
  4. Use the scan tool to request the SIR DTC display.

Does the scan tool indicate that this DTC is current?

--

Go to Step 5

Go to Diagnostic Aids

5

  1. Turn OFF the ignition.
  2. Disconnect the inflatable restraint driver seat 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 driver seat module yellow 2-way connector.
  4. Turn ON the ignition, with the engine OFF.
  5. Use the scan tool to request the SIR DTC display.

Does the scan tool indicate that this DTC is current?

--

Go to Step 7

Go to Step 6

6

Replace the inflatable restraint driver seat module. Refer to Inflatable Restraint Side Impact Module Replacement - Left Side .

Did you complete the replacement?

--

Go to Step 16

--

7

  1. Turn OFF the ignition.
  2. Remove the J 38715-A .
  3. Disconnect the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  4. Use the J 39200 Digital Multimeter (DMM) to measure the resistance between the driver side high circuit and a known good ground.

Does the resistance measure less than the specified value?

OL

Go to Step 8

Go to Step 9

8

Locate and repair the short to ground in the driver side high circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 16

--

9

Use the DMM to measure the resistance between the driver side low circuit and a known good ground.

Does the resistance measure less than the specified value?

OL

Go to Step 10

Go to Step 11

10

Locate and repair the short to ground in the driver side low circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 16

--

11

  1. Turn ON the ignition, with the engine OFF.
  2. Use the DMM to measure the voltage between the driver side high circuit and a known good ground.

Does the voltage measure less than the specified value?

1 V

Go to Step 13

Go to Step 12

12

Locate and repair the short to B+ in the driver side high circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 16

--

13

Use the DMM to measure the voltage between the driver side low circuit and a known good ground.

Does the voltage measure less than the specified value?

1 V

Go to Step 15

Go to Step 14

14

Locate and repair the short to B+ in the driver side low circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 16

--

15
  1. Turn OFF the ignition.
  2. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Did you complete the replacement?

--

Go to Step 16

--

16

  1. Reconnect all SIR components.
  2. Verify that all components and connectors are properly mounted.
  3. Turn ON the ignition, with the engine OFF.
  4. Use the scan tool in order to clear the DTCs.

Did you complete the action?

--

Go to Diagnostic System Check - SIR

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