GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the instrument cluster diagnostic system check performed?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

  1. Disconnect the instrument cluster connector.
  2. Turn the ignition switch to ON.
  3. Use a J 39200 DMM in order to measure the voltage in CKT 1600 between terminal B9 of the instrument cluster connector and ground.

Is the measured voltage to the specified value?

B+

Go to Step 3

Go to Step 6

3

Use a J 39200 DMM in order to measure the voltage in CKT 1440 between terminal A1 of the instrument cluster connector and ground.

Is the measured voltage to the specified value?

B+

Go to Step 4

Go to Step 8

4

Use a J 39200 DMM in order to measure the voltage between the instrument cluster connector terminal B9 and B10.

Is the measured voltage to the specified value?

B+

Go to Step 5

Go to Step 10

5

Use a J 39200 DMM in order to measure the voltage between the instrument cluster connector terminal A1 and A4.

Is the measured voltage to the specified value?

B+

Go to Step 12

Go to Step 11

6

Use a J 39200 DMM in order to measure the voltage in CKT 1600 between the left IP junction block connector C1 terminal C9 and ground.

Is the measured voltage to the specified value?

B+

Go to Step 7

Go to Step 13

7

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

8

  1. Disconnect the underhood junction block connector C3.
  2. Use a J 39200 DMM in order to measure the voltage between the underhood junction block connector C3 terminal F8 and ground.

Is the measured voltage to the specified value?

0V

Go to Step 10

Go to Step 9

9

Repair the short to battery voltage in CKT 121 between the underhood junction block connector C3 terminal F8 and the instrument cluster connector terminal A7.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

10

Use a J 39200 DMM in order to measure the voltage in CKT 121 between the underhood junction block connector C3 terminal F8 and ground.

Is the measured voltage to the specified value?

Go to Step 12

Go to Step 11

11

Repair the short to ground in CKT 121 between the underhood junction block connector C3 terminal F8 and the instrument cluster connector terminal A7.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

12

Use a J 39200 DMM in order to measure the resistance in CKT 121 between the underhood junction block connector C3 terminal F8 and the instrument cluster connector terminal A7.

Is the measured resistance within the specified range?

0-2 ohms

Go to Step 14

Go to Step 13

13

Repair the open in CKT 121 between the underhood junction block connector C3 terminal F8 and the instrument cluster connector terminal A7.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

14

Replace the underhood junction block. Refer to Underhood Fuse Block Replacement in Engine Electrical.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--