For 1990-2009 cars
SIR Components
Power, Ground, Serial Data, Indicator and Front Inflatable Restraint Modules
Fuel, Brake to Shift, Airbag, Check Engine, and Cruise Indicators
Ignition Switch and Fuse Block
SIR Handling Caution
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

When you first turn ON the ignition, the CLAMP 15 CRUISE Fuse applies battery voltage to the AIR BAG warning lamp. The AIR BAG warning lamp is controlled by the inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM). The ignition switch supplies battery voltage to the SDM, at terminal 5. The SDM responds by flashing the AIR BAG warning lamp seven times and then turning it OFF. The SDM monitors the AIR BAG warning lamp control circuit by comparing the output state of the AIR BAG warning lamp control circuit, at terminal 6 of the SDM, to the microprocessor commanded state.

### Conditions for Running the DTC

When the ignition voltage is within the normal operating voltage range, the SDM monitors the output state of the AIR BAG warning lamp control circuit, at terminal 6 of the SDM, to determine a mismatch between the output state and the commanded state.

### Conditions for Setting the DTC

The output state of the AIR BAG warning lamp control circuit, at terminal 6 of the SDM, does not match the commanded state for 1.25 seconds.

### Action Taken When the DTC Sets

The SDM attempts to turn ON the AIR BAG warning lamp.

### 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

These malfunctions are addressed in A Diagnostic System Check - SIR. Perform Diagnostic System Check - SIR before continuing with this table.

### Test Description

1. This step checks the instrument cluster wiring harness connector.

2. This step checks the instrument cluster terminals.

3. This step checks the AIR BAG warning lamp.

4. This step checks the AIR BAG warning lamp socket within the instrument cluster.

5. This step checks for a short between the B+ feed circuit to the instrument cluster and the AIR BAG warning lamp control circuit.

6. This step checks for a short within the instrument cluster.

7. This step checks the SDM wiring harness connector.

8. This step determines if there is a short to B+ in the AIR BAG warning lamp control circuit or if there is a malfunctioning SDM.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform A Diagnostic System Check - SIR? | -- | Go to Step 2 | Go to Diagnostic System Check - SIR
2 |

1. Turn OFF the ignition.
2. Disconnect the instrument cluster wiring harness connector. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
3. Inspect the instrument cluster wiring harness connector the following conditions, and refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems:

• | Corrosion

• | Damaged terminals

• | Poor connections/terminal tension

Does the instrument cluster wiring harness connector exhibit signs of corrosion, terminal damage, or poor connections?

--

Go to Step 3

Go to Step 4

3 | Replace the instrument cluster wiring harness connector. Refer to Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 4 | --
4 | Inspect the instrument cluster for the following conditions:

• | Corrosion

• | Damaged terminals

Does the instrument cluster exhibit signs of corrosion or poor terminal tension?

--

Go to Step 5

Go to Step 6

5 | Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges, and Console. Did you complete the replacement? | -- | Go to Step 18 | --
6 | Remove and inspect the AIR BAG warning lamp. Is the AIR BAG warning lamp OK? | -- | Go to Step 8 | Go to Step 7
7 | Replace the AIR BAG warning lamp. Did you complete the replacement? | -- | Go to Step 18 | --
8 | Inspect the AIR BAG warning lamp socket within the instrument cluster for the following conditions:

• | Corrosion

• | Damaged terminals

• | Poor connections/terminal tension

Does the AIR BAG warning lamp socket exhibit signs of corrosion, terminal damage, or poor connections?

--

Go to Step 5

Go to Step 9

9 | Use the J 39200 Digital Multimeter (DMM) to measure the resistance between terminal 13 and terminal 19 of the instrument cluster wiring harness connector. Does the resistance measure less than the specified value? | OL | Go to Step 10 | Go to Step 11
10 | Locate and repair a short between the B+ feed circuit to the instrument cluster and the AIR BAG warning lamp control circuit. Did you complete the repair? | -- | Go to Step 18 | --
11 | Use the DMM to measure the resistance between terminal 13 and terminal 19 of the instrument cluster. Does the resistance measure less than the specified value? | OL | Go to Step 5 | Go to Step 12
12 |

1. Disconnect the inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement .
2. Inspect the SDM wiring harness connector for the following conditions:

• | Corrosion

• | Damaged terminals

• | Poor connections/terminal tension

Does the SDM wiring harness connector exhibit signs of corrosion, terminal damage, or poor connections?

--

Go to Step 13

Go to Step 14

13 | Use the J 42250 Catera Terminal Repair Kit to repair or replace the SDM wiring harness connector. Refer to Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 14 | --
14 | Inspect the SDM for the following conditions:

• | Corrosion

• | Damaged terminals

Does the SDM exhibit signs of corrosion or poor terminal tension?

--

Go to Step 15

Go to Step 16

15 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement . Did you complete the replacement? | -- | Go to Step 18 | --
16 |

1. Turn ON the ignition, with the engine OFF.
2. Use the DMM to measure the voltage between the AIR BAG warning lamp control circuit and a known good ground.

Does the voltage measure greater than the specified value?

1 V

Go to Step 17

Go to Step 15

17 | Locate and repair the short to voltage in the AIR BAG warning lamp control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 18 | --
18 |

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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