Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

You must perform the Circuit/System Verification first.

Ignition OFF, disconnect the wire harness electrical connector from the B22 Brake Pedal Position Sensor.
Test for less than 10 Ω between the low reference circuit terminal 6 and ground.
- If greater than the specified value, test the low reference circuit for an open/high resistance
  If the circuit tests normal, replace the ECM.
- If less than the specified value
Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 5 and ground.
- If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance
  If the circuit tests normal, replace the K20 ECM.
- If greater than the specified range, test the 5 V reference circuit for a short to voltage
  If the circuit tests normal, replace the K20 ECM.
- If within the specified range
Verify that the scan tool Brake Pedal Position Sensor parameter is less than 0.25 volts.
- If greater than the specified value, test the signal circuit for a short to voltage
  If the circuit tests normal, replace the ECM.
- If less than the specified value
Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 5. Verify that the scan tool Brake Pedal Position Sensor parameter is between 4.8-5.2 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 K20 ECM.
- If within the specified range
If all circuits test normal, replace the B22 Brake Pedal Position Sensor.