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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 324 (COMPUTER/INTEGRATING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER MODE MISMATCHTEST DESCRIPTION
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Test Description

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Test Description
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 6:  This step tests for battery voltage on the incorrect signal circuits.
  2. 7:  This step tests for no battery voltage on the required signal circuits.
  3. 8:  If any ignition switch parameters that should be inactive in the present ignition switch position are active, 2 ignition switch signal circuits may be shorted together.
  4. 9:  This step eliminates open circuits as the cause of the malfunction.
Power Mode Mismatch

Step Action Yes No
Schematic Reference: Power Distribution Schematics
Connector End View Reference: Master Electrical Component List
IMPORTANT: Open the driver door and leave it open during this test. This will disable the retained accessory power (RAP) power mode and eliminate the RAP power mode from the power mode parameter list.
1
  1. Install a scan tool.
  2. Turn OFF the ignition.
  3. With a scan tool, observe the Power Mode parameter.
Does the displayed power mode parameter match the actual ignition switch position?		 Go to Step 2  Go to Step 6 
2
  1. Turn the ignition switch to the UNLOCK position.
  2. With a scan tool, observe the Power Mode parameter.
Does the displayed power mode parameter match the actual ignition switch position?		 Go to Step 3  Go to Step 6 
3
  1. Turn the ignition switch to the RUN position, with the engine OFF.
  2. With a scan tool, observe the Power Mode parameter.
Does the displayed power mode parameter match the actual ignition switch position?		 Go to Step 4  Go to Step 6 
4
IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode.
  1. Turn the ignition switch to the CRANK position.
  2. With a scan tool, observe the Power Mode parameter.
Does the displayed power mode parameter match the actual ignition switch position?		 Go to Step 5  Go to Step 6 
5
  1. Turn the ignition switch to the ACCY position.
  2. With a scan tool, observe the Power Mode parameter.
Does the displayed power mode parameter match the actual ignition switch position?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 6 
6 
IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode.
  1. Turn OFF the ignition.
  2. Disconnect the power mode master (PMM).
  3. Hold the ignition switch in the position that indicated the incorrect power mode.
  4. With a DMM attached to a good ground, test all the PMM ignition switch inputs for the proper positive voltage. Refer to Body Control System Description and Operation  for the state of the input circuits at a specified ignition switch position.
Is voltage present on only the inputs selected by the ignition switch position?		 Go to Step 7  Go to Step 8 
7 
IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode.
  1. Hold the ignition switch in the position that indicated the incorrect power mode.
  2. With a DMM attached to a good ground, test the PMM ignition switch inputs for voltage. Refer to Body Control System Description and Operation .
Do the acquired readings match the PMM table in ?		 Go to Step 9  Go to Step 11 
8 
  1. Disconnect the ignition switch.
  2. Test the PMM ignition switch input circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
  3. Test the PMM ignition switch circuits for a short between circuits. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
9 
  1. Disconnect the ignition switch.
  2. Test the PMM ignition switch input circuits for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
10 Inspect for poor connections and terminal tension at the harness connector of the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 12 
11 Inspect for poor connections and terminal tension at the harness connector of the PMM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
12 Replace the ignition switch. Refer to Ignition Switch Replacement .
Did you complete the replacement?		 Go to Step 14  -
13
IMPORTANT: After replacement of the PMM perform the Programming/RPO Configuration for the module. Refer to Body Control Module (BCM) Programming/RPO Configuration .
Replace the PMM. Refer to Control Module References .Did you complete the replacement?		 Go to Step 14  -
14
  1. Reconnect all disconnected components.
  2. With a scan tool, observe the Power Mode parameter.
  3. Cycle the ignition switch through all possible positions one at a time.
Does the displayed power mode parameter match the actual ignition switch position?		 System OK Go to Step 1 
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.