GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Riviera 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Speedometer and/or Odometer Inoperative

Speedometer and/or Odometer Inoperative Buick

Step

Action

Value(s)

Yes

No

1

Perform the Instrument Cluster System Check.

Is the system check complete?

--

Go to Step 2

Go to Instrument Cluster System Check

2
  1. Disconnect the PCM connector C1.
  2. Connect the J 33431-C signal generator I/P tester to the PCM connector C1 terminal 55.
  3. Connect the J 33431-C ground terminal to a good chassis ground.
  4. Set the J 33431-C to 110 mph.
  5. Turn the ignition switch to RUN.

Does the speedometer read the specified speed?

110 mph

Go to Step 6

Go to Step 3

3

Inspect CKT 817 for the following conditions:

    • An open
    • A short to ground
    • A short to voltage.

Is the wiring OK?

--

Go to Step 5

Go to Step 4

4

Repair the wiring.

Is the repair complete?

--

Go to Step 5

--

5

Inspect for a poor connection at the instrument cluster vehicle speed input terminal.

Is the connection OK?

--

Go to Step 7

--

6

Inspect for a poor connection at the PCM connector C2 terminal 25.

Is the connection OK?

--

Go to Step 8

--

7

Service the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

8

Replace the PCM.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

Speedometer and/or Odometer Inoperative Oldsmobile

Step

Action

Value(s)

Yes

No

1

Perform the Instrument Cluster System Check.

Is the system check complete?

--

Go to Step 2

Go to Instrument Cluster System Check

2
  1. Disconnect the PCM connector C2.
  2. Connect the J 33431-C signal generator I/P tester to the PCM connector C2 terminal 25.
  3. Connect the J 33431-C ground terminal to a good chassis ground.
  4. Set the J 33431-C to 110 mph.
  5. Turn the ignition switch to RUN.

Does the speedometer read the specified speed?

110 mph

Go to Step 6

Go to Step 3

3

Inspect CKT 817 for the following conditions:

    • An open
    • A short to ground
    • A short to voltage.

Is the wiring OK?

--

Go to Step 5

Go to Step 4

4

Repair the wiring.

Is the repair complete?

--

Go to Step 5

--

5

Inspect for a poor connection at the instrument cluster vehicle speed input terminal.

Is the connection OK?

--

Go to Step 7

--

6

Inspect for a poor connection at the PCM connector C2 terminal 25.

Is the connection OK?

--

Go to Step 8

--

7

Service the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

8

Replace the PCM.

Is the repair complete?

--

Go to Instrument Cluster System Check

--