GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Remove the scan tool from the data link connector (DLC).
  2. Connect a J 35616-200 test lamp between the DLC, cavity 16, and ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 2

2

Repair the open in CKT 1440 (ORN) between the LH IP junction block and the DLC, cavity 16.

Is the scan tool operative?

--

Go to Data Link Communications System Check

Go to Step 3

3

Connect an unpowered test lamp between cavity 5 and cavity 16 of the DLC.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

4

Repair the open in CKT 451 (BLK/WHT) between the DLC, cavity 5, and ground G102.

Is the scan tool operative?

--

Go to Data Link Communications System Check

Go to Step 5

5

Connect an unpowered test lamp between cavity 4 and cavity 16 of the DLC.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

6

Refer to Scan Tool Does Not Communicate with Components .

Is the scan tool operative?

--

Go to Data Link Communications System Check

Go to Step 7

7

Repair the open in CKT 150 (BLK) between the DLC, cavity 4, and ground G201.

Is the scan tool operative?

--

Go to Data Link Communications System Check

--