Circuit/System Testing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the steering wheel position sensor.
- Test for less than 5 ohms between the low reference circuit terminal 2 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
- If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
- If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
- Verify the scan tool SWPS Signal A and Signal B parameter is less than 0 volts.
- If greater than the specified range, test the appropriate signal circuit terminal for a short to voltage. If the circuit tests normal, replace the EBCM.
- Install a 3A fused jumper wire at the 5-volt reference circuit terminal 1. Toggle the jumper wire between the 5-volt reference circuit terminal 1 and the signal A circuit terminal 5 and signal B circuit terminal 6. Verify the scan tool SWPS Signal A and SWPS Signal B parameter is greater than 4.75-volts.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
- If all circuits test normal, test or replace the steering wheel position sensor.