GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

The data link connector (DLC) does not provide B+ or ground for the scan tool operation.

1

Was the Data Link Connector (DLC) System Check performed?

--

Go to Step 2

Go to Data Link Communications System Check

2

Does the radio and IP cluster work?

--

Go to Step 3

Go to Step 4

3

Using a test light, connect between DLC terminal 16 and ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 8

4

Inspect the RADIO-HVAC fuse.

Is the RADIO-HVAC fuse open?

--

Go to Step 5

Go to Step 8

5

  1. Replace the RADIO-HVAC fuse.
  2. Test the RADIO-HVAC fuse again.

Is the RADIO-HVAC fuse open again?

--

Go to Step 7

Go to Step 9

6

Using a test light, connect between DLC terminal 4 and terminal 16.

Does the test light illuminate?

--

Go to Step 10

Go to Step 11

7

Repair the short to ground in circuit 640.

Is the short repaired?

--

Go to Step 16

--

8

Repair a poor connection or an open in circuit 640.

Has the repair been made?

--

Go to Step 16

--

9

Repair an intermittent short to ground in circuit 640.

Has the repair been made?

--

Go to Step 16

--

10

Using a test light, connect between DLC terminal 5 and terminal 16.

Does the test light illuminate?

--

Go to Step 12

Go to Step 13

11

Repair a poor connection or an open in circuit 1450.

Has the repair been made?

--

Go to Step 16

--

12

Connect the scan tool on another vehicle.

Does the scan tool operate correctly on the other vehicle?

--

Go to Step 14

Go to Step 15

13

Repair a poor connection or an open in circuit 1550.

Has the repair been made?

--

Go to Step 16

--

14

Repair a poor connection between the scan tool and the DLC.

Has the repair been made?

--

Go to Step 16

--

15

Test for a faulty scan tool.

Refer to the scan tool manual for more information.

Has the repair been made?

--

Go to Step 16

--

16

  1. Turn the ignition switch to the LOCK position.
  2. Connect the connectors.
  3. Install any components that you removed.

Have all the repairs been made?

--

Go to Data Link Communications System Check

--