Document ID# 1229569
1998 Saturn SL2/SC2/SW2 		 

SIR Diagnostic System Check Chart D


Object Number: 1207174 Size: MF
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Circuit Description

When the ignition switch is first turned ON, "Ignition 1" voltage is applied to the AIR BAG telltale lamp which is connected to the "AIR BAG" terminal A7 of the SDM. The AIR BAG fuse applies system voltage to the "Ignition 1" input terminal A10 of the SDM. The SDM responds by flashing the AIR BAG telltale lamp seven times by providing a ground. If "Ignition 1" is outside the normal operating voltage range (approximately 9 VDC to 16 VDC), the AIR BAG telltale lamp will come ON solid with no diagnostic trouble code set.

Test Description

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

  1. This step checks to make sure the Scan tool is properly connected to the DLC.

    2.

  2. This step verifies the proper software package.

    3.

  3. This step checks for a short to ground on the Serial Data circuit.

    4.

  4. This step checks for an open in the "Serial Data" circuit.

    5.

  5. This step checks for a short to the battery, B+, on the "Serial Data" circuit.

Diagnostic Aids:

When measurements are requested in this chart, use SA 91114NEDVM with correct terminal adapter from SA 9206Z. When a check for proper connection is requested, refer to Intermittent and Poor Connections. When a wire connector or terminal repair is requested, use the proper repair parts and refer to Wiring Repairs .

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - SIR?

Go to Step 2

Go to SIR Diagnostic System Check

2

Check for proper connection of scan tool to DLC.

Is the connection good.

Go to Step 3

Go to Step 4

3

Disconnect scan tool.

Is the correct software installed in the Scan Tool?

Go to Step 5

Go to Step 6

4

Properly connect scan tool to DLC.

Repeat SIR Diagnostic System Check.

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5

  1. Turn OFF the ignition.
  2. Disconnect driver and passenger inflator modules, yellow two-way connectors located at the base of the steering column and under the instrument panel top cover.
  3. Disconnect SDM.
  4. Measure resistance on SDM harness connector from terminal A6 (ground) to terminal A5.

Is resistance five ohms or less?

Go to Step 7

Go to Step 8

6

Download correct software from SSS (Service Stall System).

Repeat SIR Diagnostic System Check.

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7

Repair short to ground in circuit 800.

Go to Step 12

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8

Measure resistance from DLC terminal 9 to SDM harness connector terminal A 5.

Go to Step 9

Go to Step 10

9

  1. Turn ON ignition.
  2. Measure voltage on DLC from terminal 9 to terminal 4 (ground).

Is voltage six volts or less?

Go to Step 11

Go to Step 12

10

Repair open in circuit 800.

Go to Step 13

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11
  1. Turn OFF ignition.
  2. Check for proper connection at DLC terminal 9 and SDM harness connector terminal A5.
  3. Repair terminals if necessary.
  4. If all connections are good, replace SDM.

Go to Step 13

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12
  1. Turn OFF ignition.
  2. Repair short to battery, B+, in circuit 800.

Go to Step 13

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13
  1. Make sure all components are properly mounted.
  2. Reconnect all SIR system components.
  3. Clear SIR codes.

Repeat SIR Diagnostic System Check.

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  Document ID# 1229569
1998 Saturn SL2/SC2/SW2