Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Testing
2010 Saturn Vue XE, 3.5 NSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
- Inspect for an open B+ fuse. The fuse should be OK.
- If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
- B+ to the ignition switch
- Accessory voltage
- Off/Run/Crank voltage
- Ignition 1 voltage
- Accessory wakeup serial data (BCM output)
- Run/crank ignition 1 voltage (BCM output)
- If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
- Disconnect the harness connector at the ignition switch.
- Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
- If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
- Perform the ignition switch component test. The test should pass.
- If the ignition switch fails, replace the ignition switch.
- Ignition OFF, disconnect the X1 harness connector at the BCM, test for less than 1.0 V between the following circuit terminals of the BCM and ground.
- Ignition key resistor signal terminal 2
- 5-V reference terminal 4
- Accessory voltage terminal 21
- Ignition 1 voltage terminal 14
- If greater than the specified range, test the circuit for a short to voltage.
- Test for less than 1.0 Ξ© of resistance between the BCM and the ignition switch on the following circuit terminals.
- Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 4
- Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5
- Accessory voltage, BCM terminal 21 and ignition switch terminal 2
- Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 1
- If greater than the specified range, test the circuit for open/high resistance
- Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
- If less than the specified value, test the signal circuit for a short to ground.
- If all circuits test normal, replace the BCM.
IMPORTANT:
The ignition switch component test must be performed before proceeding with this test to verify the integrity of the switch.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.