Circuit/System Testing
WARNING: This page is about a different car, the 2006 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the BPPS.
- Connect a DMM between the BPPS 5-volt reference circuit and the negative terminal of the battery.
- Ignition ON, test for 4.7-5.2 volts.
- If less then 4.7 volts, test the BPPS 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the BCM.
- If greater than 5.2 volts, test the BPPS 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the BCM.
- Connect a DMM between the BPPS low reference circuit and the negative terminal of the battery.
- Ignition ON, test for less than 0.1 volt.
- If greater than 0.1 volt, test the BPPS low reference circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the BCM.
- Verify the scan tool brake pedal position sensor parameter displays 0 counts.
- If greater than 0 counts, test the BPPS circuit for a short to voltage. If the circuit/connections test normal, replace the BCM.
- Install a 3-amp fused jumper wire between the BPPS circuit and the BPPS 5-volt reference circuit.
- Verify the scan tool brake pedal position sensor parameter displays 3 counts.
- If less than 3 counts, test the BPPS circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the BCM.
- If the voltage is correct and all circuits/connections test normal, replace the BPPS.