Schematic Reference: Instrument Cluster Schematics

1

Did you perform the IPC Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

1. Install a scan tool.
2. Raise the vehicle's drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
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?

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Go to Step 3

Go to Step 4

Does the odometer operate properly?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 15

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?

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Go to Step 9

Go to Step 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?

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Go to Step 10

Go to Step 6

1. Turn the ignition OFF.
2. Disconnect the 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?

9.0 V

Go to Step 8

Go to Step 7

Test the vehicle speed signal circuit for an open, for a high resistance, or for a short to ground between the IPC and the ECM. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 11

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 in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 12

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

Did you find and correct the condition?

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Go to Step 17

Go to Step 13

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 in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 14

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

Did you find and correct the condition?

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Go to Step 17

Go to Step 15

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

Did you find and correct the condition?

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Go to Step 17

Go to Step 16

Replace the radio. Refer to Radio Replacement in Entertainment.

Did you complete the replacement?

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Go to Step 17

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Replace the rear object alarm detection module. Refer to Object Alarm Module Replacement in Rear Parking Assist.

Did you complete the replacement?

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Go to Step 17

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Replace the IPC. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

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Go to Step 17

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Important: Program the replacement ECM.

Replace the ECM. Refer to Engine Control Module Replacement in Engine Controls - 3.6L (LY7) or Engine Control Module Replacement in Engine Controls - 4.6L (LH2).

Did you complete the replacement?

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Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2