GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the DLC System Check performed?

--

Go to Step 2

Go to Data Link Communications System Check

2

Was the SIR Diagnostic System Check performed?

--

Go to Step 3

Go to SRS Diagnostic System Check in SRS

3

May the scan tool be powered up?

--

Go to Step 11

Go to Step 4

4

  1. Disconnect the scan tool from the data link connector.
  2. Inspect for proper connection of the scan tool to the data link connector at terminal 4 and terminal 16.

Is the connection good?

--

Go to Step 5

Go to Step 7

5

Measure the resistance from terminal 4 of the DLC to ground.

Does the resistance equal the specified value?

0-5 

Go to Step 6

Go to Step 9

6

Measure the voltage from terminal 16 to terminal 4 of the DLC to ground.

Is the voltage within the specified range?

Battery Voltage

Go to Step 8

Go to Step 10

7

Repair the connection as needed.

Is the repair complete?

--

Go to SRS Diagnostic System Check in SRS

--

8

Inspect the scan tool for a malfunction. Refer to the scan tool instruction manual.

Has a properly operating scan tool been obtained?

--

Go to Step 3

--

9

Repair an open in CKT 640 (ORN).

Is the repair complete?

--

Go to SRS Diagnostic System Check in SRS

--

10

Repair an open in CKT 1850 (BLK)

Is the repair complete?

--

Go to SRS Diagnostic System Check in SRS

--

11

Inspect for proper connection of the scan tool to the data link connector at terminal 9.

Is the connection good?

--

Go to Step 12

Go to Step 7

12

  1. Disconnect the inflatable restraint sensing and diagnostic module.
  2. Inspect for proper connection to the inflatable restraint sensing and diagnostic module at terminal 5.

Is the connection good?

--

Go to Step 13

Go to Step 20

13

Measure the resistance from terminal 9 of the DLC to terminal 5 of the inflatable restraint sensing and diagnostic module.

Is the resistance within the specified range?

0-5 ohms

Go to Step 14

Go to Step 19

14

Measure the resistance on the DLC from terminal 9 to terminal 4.

Is the resistance as specified?

OL (Infinite)

Go to Step 15

Go to Step 18

15

  1. Turn the ignition switch to the RUN position.
  2. Measure the voltage on the DLC from terminal 9 to terminal 4.

Is the voltage within the specified range?

0-1 V

Go to Step 16

Go to Step 17

16

  1. Turn the ignition switch to the OFF position.
  2. Replace the inflatable restraint sensing and diagnostic module.

Is the repair complete?

--

Go to SRS Diagnostic System Check in SRS

--

17

  1. Turn the ignition switch to the OFF position.
  2. Repair the short to voltage in CKT 800.

Is the repair complete?

--

Go to SRS Diagnostic System Check in SRS

--

18

Repair the short to ground in CKT 800.

Is the repair complete?

--

Go to SRS Diagnostic System Check in SRS

--

19

Repair the open in CKT 800.

Is the repair complete?

--

Go to SRS Diagnostic System Check in SRS

--

20

Repair the connection as needed. Refer to SIR connector repair.

Is the repair complete?

--

Go to SRS Diagnostic System Check in SRS

--