GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Radio/Audio System Check?

--

Go to Step 2

Go to Radio/Audio System Check

2

Inspect for vehicle speed sensor diagnostic trouble codes (DTCs). Repair as necessary.

Where any repairs performed?

--

Go to Radio/Audio System Check

Go to Step 3

3

Test drive the vehicle. Verify that the speedometer operates.

Does the speedometer operate?

--

Go to Step 9

Go to Step 4

4

Test CKT 389 (DK GRN) for an open between the PCM/VCM control module and connector C203.

Is there an open in CKT 389 (DK GRN)?

--

Go to Step 5

Go to Step 6

5

Repair the open in CKT 389 (DK GRN).

Is the repair complete?

--

Go to Radio/Audio System Check

--

6

Test CKT 389 (DK GRN) for a short to ground.

Is there a short to ground in CKT 389 (DK GRN)

--

Go to Step 7

Go to Step 8

7

Repair the short to ground in CKT 389 (DK GRN).

Is the repair complete?

--

Go to Radio/Audio System Check

--

8

Replace the PCM/VCM control module. Refer to Powertrain Control Module Replacement or VCM Replacement/Programming .

Is the replacement complete?

--

Go to Radio/Audio System Check

--

9

Test CKT 389 (DK GRN) for an open between the radio and connector C203.

Is there an open in CKT 389 (DK GRN)?

--

Go to Step 5

Go to Step 10

10

Service the radio. Refer to Radio Replacement .

Is service of the radio complete?

--

Go to Radio/Audio System Check

--