GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Raise the vehicles drive wheels. Refer to Lifting and Jacking the Vehicle .
  3. Start the engine.
  4. Place the transmission into drive.
  5. With the scan tool, observe the Vehicle Speed Sensor parameter in the ECM Engine Data 1 data list.

Does the Vehicle Speed Sensor parameter match the speedometer display?

--

Go to Step 3

Go to Step 4

3

Does the odometer operate properly?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 15

4

  1. Turn the ignition OFF.
  2. Disconnect the radio.
  3. Start the engine.
  4. Place the transmission into drive.
  5. With the scan tool, observe the Vehicle Speed Sensor parameter in the ECM Engine Data 1 data list.

Does the Vehicle Speed Sensor parameter match the speedometer display?

--

Go to Step 9

Go to Step 5

5

  1. Turn the ignition OFF.
  2. Disconnect the rear object alarm detection module.
  3. Start the engine.
  4. Place the transmission into drive.
  5. With the scan tool, observe the Vehicle Speed Sensor parameter in the Engine Data 1 data list.

Does the Vehicle Speed Sensor parameter match the speedometer display?

--

Go to Step 10

Go to Step 6

6

  1. Turn the ignition OFF.
  2. Disconnect the engine control module (ECM) connector C1.
  3. Turn the ignition ON.
  4. Measure the voltage between the vehicle speed signal circuit and a good ground.

Does the voltage measure greater than the specified value?

9 V

Go to Step 8

Go to Step 7

7

Test the vehicle speed signal circuit for the following between the instrument panel cluster (IPC) and the ECM.

    • An open
    • A high resistance
    • A short to ground

Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 17

Go to Step 11

8

Test the vehicle speed signal circuit for a short to voltage between the IPC and the ECM. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 17

Go to Step 12

9

Inspect for poor connections at the harness connector of the radio. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 17

Go to Step 13

10

Inspect for poor connections at the harness connector of the rear object alarm detection module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 17

Go to Step 14

11

Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 17

Go to Step 15

12

Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 17

Go to Step 16

13

Replace the radio. Refer to Control Module References for replacement, setup and programming.

Did you complete the replacement?

--

Go to Step 17

--

14

Replace the rear object alarm detection module. Refer to Control Module References for replacement, setup and programming.

Did you complete the replacement?

--

Go to Step 17

--

15

Replace the IPC. Refer to Control Module References for replacement, setup and programming.

Did you complete the replacement?

--

Go to Step 17

--

16

Replace the ECM. Refer to Control Module References for replacement, setup and programming.

Did you complete the replacement?

--

Go to Step 17

--

17

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2