• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

For symptom byte information refer to Symptom Byte List

The vehicle power mode master is the body control module (BCM). The BCM monitors switch inputs and will activate relays and other direct outputs of the power mode master as needed according to the calculated power mode.

The instrument cluster has a switched voltage input and may operate in a default mode if the power mode master serial data message does not match what the individual module can see from its own connections.

Ignition Mode is in Accessory position.

Ignition Mode is in Accessory, Run, or Crank positions.

Ignition circuit is shorted to voltage.

• Ignition circuit is open.
• Ignition circuit is shorted to ground.

The Instrument Cluster still functions except the malfunction indicator lamp is always off.

• The condition responsible for setting the DTC no longer exists.
• A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Instrument Cluster Schematics

Master Electrical Component List

• Instrument Cluster Description and Operation
• Power Mode Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Verify that DTC B144B is not set.
• If DTC B144B is set

  Refer to Diagnostic Trouble Code (DTC) List - Vehicle.

• If DTC B144B is not set
2. Refer to Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
2. Verify that a test lamp does not illuminate between the ignition circuit terminal 8 and ground.
• If the test lamp illuminates

  Repair the short to voltage on the ignition circuit.

• If the test lamp does not illuminate
3. Ignition ON.
4. Verify that a test lamp illuminates between the ignition terminal 8 and ground.
• If the test lamp does not illuminate and the Ignition fuse is good
1. Ignition OFF, remove the test lamp.
2. Test for less than 2 Ω in the ignition circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, refer to Power Mode Mismatch.
• If the test lamp does not illuminate and the Ignition fuse is open
1. Ignition OFF, remove the test lamp.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the P16 Instrument Cluster.
• If the test lamp illuminates
5. Replace the P16 Instrument Cluster.

Perform the Diagnostic Repair Verification after completing the repair.

• Control Module References for control module replacement, programming and setup.