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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Eldorado 🢒 Restraints 🢒 SIR 🢒 DTC B1117 Passenger Deployment Loop Open

Object Number: 585653 Size: MF
SIR Components
SIR Schematics
SIR Handling Caution
Handling ESD Sensitive Parts Notice
SIR Schematic Icons

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 measures the ignition positive voltage in order to ensure that the voltage is within the respective normal voltage range. The SDM proceeds with the deployment loop continuity test. During the deployment loop continuity test, the SDM measures the voltage difference between the high and low deployment circuits.

Conditions for Running the DTC

Deployment loop voltage out of range test:

    • Ignition 1 voltage is within the normal operating voltage range.
    • Passenger frontal deployment loop is not shorted to voltage.
    • The voltage difference between the passenger frontal high and low is greater than or equal to 426 millivolts for 500 milliseconds.

Deployment loop resistance measurement test:

    • Ignition 1 voltage is within the normal operating voltage range.
    • Passenger frontal deployment loop is not shorted to voltage.
    • Passenger frontal deployment loop is not shorted to ground.

Conditions for Setting the DTC

Deployment loop voltage out of range test - Passenger frontal deployment loop is greater than or equal to 426 millivolts for 500 milliseconds.

Deployment loop resistance measurement test - Passenger frontal deployment loop resistance is greater than or equal to 250 ohms for 500 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
    • The voltage difference between the passenger frontal high and low circuits are less than 426 millivolts for 500 milliseconds.
    • The passenger frontal deployment loop resistance is less than 250 ohms for 500 milliseconds.
    • You can issue a CLEAR CODES command
    • A history DTC will clear once 250 malfunction free ignition cycles have occurred

Diagnostic Aids

The following can cause an intermittent condition:

    • The inflatable restraint IP module harness connector.
    • The SDM wiring harness connector.
    • The wire to terminal connection or open in the passenger frontal high circuit.
    • The wire to terminal connection or open in the passenger frontal low circuit.

If any of the above conditions are found refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

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

  1. This step checks the IP/passenger inflator module in-line connector.

    2.

  2. This step checks to see if there is a malfunctioning inflatable restraint passenger frontal module.

    3.

  3. This step checks to see if the inflatable restraint sensing and diagnostic module (SDM) wiring harness connector is OK.

    4.

  4. This step checks to see if there is an open or high resistance in the passenger frontal high deployment circuit.

    5.

  5. This step determines if there is an open or high resistance in the passenger frontal low deployment circuit or if there is a malfunctioning SDM.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - SIR

2

  1. Turn OFF the ignition.
  2. Disconnect inflatable restraint IP/passenger inflator module in-line connector.
  3. Inspect the wiring harness in-line connector for the following conditions:
    4. • Corrosion
    • Terminal damaged
    • Poor connections/terminal tension
  4. If any of the above conditions are found refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Does connector exhibits any signs of corrosion, terminal damaged, or poor connections?

--

Go to Step 3

Go to Step 4

3

Replace the wiring harness side of in-line connector. Refer to Connector Repairs in Wiring Systems.

Did you complete the replacement?

--

Go to Step 14

--

4
  1. Reconnect inflatable restraint IP module in-line 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 SIR DTCs displayed.

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 in-line connector.
  3. Install the J 38715-A SIR Load Tool to the wiring harness side of in-line connector. Use appropriate connector adaptors where necessary.
  4. Turn ON the ignition, with the engine OFF.
  5. Use the scan tool to request SIR DTCs displayed.

Does the scan tool indicate that this DTC is current?

--

Go to Step 7

Go to Step 6

6
  1. Turn OFF the ignition.
  2. Replace the inflatable restraint passenger inflator module. Refer to Inflatable Restraint Instrument Panel Module Replacement .

Did you complete the replacement?

--

Go to Step 14

--

7

  1. Turn OFF the ignition.
  2. Remove the J 38715-A SIR Load Tool.
  3. Disconnect the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  4. Check for proper connection of passenger frontal high and low deployment circuit terminals of the SDM connector.

Is the SDM wiring harness connector OK?

--

Go to Step 9

Go to Step 8

8

Repair or replace the SDM wiring harness connector. Refer to Connector Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 14

--

9

Use the J 39200 DMM and measure the resistance of passenger frontal high circuit between in-line connector terminal and the SDM wiring harness connector.

Does the resistance measure greater than the specified value?

0-0.5 ohms

Go to Step 10

Go to Step 11

10

Locate and repair the open or a high resistance in passenger frontal high deployment circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 14

--

11

Use the J 39200 and measure the resistance of passenger frontal low circuit between in-line connector terminal and the SDM wiring harness connector.

Does the resistance measure greater than the specified value?

0-0.5 ohms

Go to Step 12

Go to Step 13

12

Locate and repair the open or a high resistance in passenger frontal low deployment circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 14

--

13

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

Did you complete the replacement?

--

Go to Step 14

--

14
  1. Reconnect all SIR components.
  2. Verify that all components, connectors and CPAs are properly mounted.
  3. Use the scan tool in order to Clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Did you complete the action?

--

Go to Diagnostic System Check - SIR

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