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Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. 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 signal circuits that are not required.
  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 Moding Schematics
Connector End View Reference:  Master Electrical Component List 
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. Turn OFF the ignition.
  3. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter.
Does the scan tool display Off Awake?		 Go to Step 3  Go to Step 6 
3
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter.
Does the scan tool display Run?		 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, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter.
Does the scan tool display Crank?		 Go to Step 5  Go to Step 6 
5
  1. Turn the ignition switch to the ACC position.
  2. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter.
Does the scan tool display Accessory?		 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 body control module (BCM).
  3. Hold the ignition switch in the position that indicated the incorrect power mode.
  4. With a test lamp attached to a good ground, test the BCM ignition switch inputs for voltage.
Is voltage present on only the inputs specified for 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 test lamp attached to a good ground, test the BCM ignition switch inputs for voltage.
Is voltage not present on any inputs specified for the ignition switch position?		 Go to Step 9  Go to Step 11 
8 
  1. Disconnect the ignition switch.
  2. Test the BCM ignition switch input circuits for a short to voltage. Refer to Circuit Testing  and Wiring Repairs .
  3. Test the BCM 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 BCM 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 BCM. 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 and Start Switch Replacement .
Did you complete the replacement?		 Go to Step 14  -
13 Replace the BCM. Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 14  -
14
IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying all power modes.
  1. Reconnect all disconnected components.
  2. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 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 2 
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